for Journals by Title or ISSN
for Articles by Keywords
help

Publisher: Elsevier   (Total: 3031 journals)

 A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z  

        1 2 3 4 5 6 7 8 | Last   [Sort by number of followers]   [Restore default list]

Showing 1 - 200 of 3031 Journals sorted alphabetically
AASRI Procedia     Open Access   (Followers: 15)
Academic Pediatrics     Hybrid Journal   (Followers: 20, SJR: 1.402, h-index: 51)
Academic Radiology     Hybrid Journal   (Followers: 16, SJR: 1.008, h-index: 75)
Accident Analysis & Prevention     Partially Free   (Followers: 79, SJR: 1.109, h-index: 94)
Accounting Forum     Hybrid Journal   (Followers: 22, SJR: 0.612, h-index: 27)
Accounting, Organizations and Society     Hybrid Journal   (Followers: 27, SJR: 2.515, h-index: 90)
Achievements in the Life Sciences     Open Access   (Followers: 4)
Acta Anaesthesiologica Taiwanica     Open Access   (Followers: 5, SJR: 0.338, h-index: 19)
Acta Astronautica     Hybrid Journal   (Followers: 302, SJR: 0.726, h-index: 43)
Acta Automatica Sinica     Full-text available via subscription   (Followers: 3)
Acta Biomaterialia     Hybrid Journal   (Followers: 25, SJR: 2.02, h-index: 104)
Acta Colombiana de Cuidado Intensivo     Full-text available via subscription  
Acta de Investigación Psicológica     Open Access   (Followers: 2)
Acta Ecologica Sinica     Open Access   (Followers: 8, SJR: 0.172, h-index: 29)
Acta Haematologica Polonica     Free   (SJR: 0.123, h-index: 8)
Acta Histochemica     Hybrid Journal   (Followers: 3, SJR: 0.604, h-index: 38)
Acta Materialia     Hybrid Journal   (Followers: 195, SJR: 3.683, h-index: 202)
Acta Mathematica Scientia     Full-text available via subscription   (Followers: 5, SJR: 0.615, h-index: 21)
Acta Mechanica Solida Sinica     Full-text available via subscription   (Followers: 9, SJR: 0.442, h-index: 21)
Acta Oecologica     Hybrid Journal   (Followers: 9, SJR: 0.915, h-index: 53)
Acta Otorrinolaringologica (English Edition)     Full-text available via subscription   (Followers: 1)
Acta Otorrinolaringológica Española     Full-text available via subscription   (Followers: 3, SJR: 0.311, h-index: 16)
Acta Pharmaceutica Sinica B     Open Access   (Followers: 2)
Acta Poética     Open Access   (Followers: 4)
Acta Psychologica     Hybrid Journal   (Followers: 21, SJR: 1.365, h-index: 73)
Acta Sociológica     Open Access  
Acta Tropica     Hybrid Journal   (Followers: 5, SJR: 1.059, h-index: 77)
Acta Urológica Portuguesa     Open Access  
Actas Dermo-Sifiliograficas     Full-text available via subscription   (Followers: 4)
Actas Dermo-Sifiliográficas (English Edition)     Full-text available via subscription   (Followers: 3)
Actas Urológicas Españolas     Full-text available via subscription   (Followers: 3, SJR: 0.383, h-index: 19)
Actas Urológicas Españolas (English Edition)     Full-text available via subscription   (Followers: 2)
Actualites Pharmaceutiques     Full-text available via subscription   (Followers: 5, SJR: 0.141, h-index: 3)
Actualites Pharmaceutiques Hospitalieres     Full-text available via subscription   (Followers: 4, SJR: 0.112, h-index: 2)
Acupuncture and Related Therapies     Hybrid Journal   (Followers: 4)
Ad Hoc Networks     Hybrid Journal   (Followers: 11, SJR: 0.967, h-index: 57)
Addictive Behaviors     Hybrid Journal   (Followers: 15, SJR: 1.514, h-index: 92)
Addictive Behaviors Reports     Open Access   (Followers: 5)
Additive Manufacturing     Hybrid Journal   (Followers: 7, SJR: 1.039, h-index: 5)
Additives for Polymers     Full-text available via subscription   (Followers: 20)
Advanced Drug Delivery Reviews     Hybrid Journal   (Followers: 119, SJR: 5.2, h-index: 222)
Advanced Engineering Informatics     Hybrid Journal   (Followers: 11, SJR: 1.265, h-index: 53)
Advanced Powder Technology     Hybrid Journal   (Followers: 16, SJR: 0.739, h-index: 33)
Advances in Accounting     Hybrid Journal   (Followers: 8, SJR: 0.299, h-index: 15)
Advances in Agronomy     Full-text available via subscription   (Followers: 15, SJR: 2.071, h-index: 82)
Advances in Anesthesia     Full-text available via subscription   (Followers: 24, SJR: 0.169, h-index: 4)
Advances in Antiviral Drug Design     Full-text available via subscription   (Followers: 3)
Advances in Applied Mathematics     Full-text available via subscription   (Followers: 6, SJR: 1.054, h-index: 35)
Advances in Applied Mechanics     Full-text available via subscription   (Followers: 10, SJR: 0.801, h-index: 26)
Advances in Applied Microbiology     Full-text available via subscription   (Followers: 21, SJR: 1.286, h-index: 49)
Advances In Atomic, Molecular, and Optical Physics     Full-text available via subscription   (Followers: 16, SJR: 3.31, h-index: 42)
Advances in Biological Regulation     Hybrid Journal   (Followers: 4, SJR: 2.277, h-index: 43)
Advances in Botanical Research     Full-text available via subscription   (Followers: 3, SJR: 0.619, h-index: 48)
Advances in Cancer Research     Full-text available via subscription   (Followers: 26, SJR: 2.215, h-index: 78)
Advances in Carbohydrate Chemistry and Biochemistry     Full-text available via subscription   (Followers: 9, SJR: 0.9, h-index: 30)
Advances in Catalysis     Full-text available via subscription   (Followers: 5, SJR: 2.139, h-index: 42)
Advances in Cellular and Molecular Biology of Membranes and Organelles     Full-text available via subscription   (Followers: 12)
Advances in Chemical Engineering     Full-text available via subscription   (Followers: 24, SJR: 0.183, h-index: 23)
Advances in Child Development and Behavior     Full-text available via subscription   (Followers: 10, SJR: 0.665, h-index: 29)
Advances in Chronic Kidney Disease     Full-text available via subscription   (Followers: 8, SJR: 1.268, h-index: 45)
Advances in Clinical Chemistry     Full-text available via subscription   (Followers: 28, SJR: 0.938, h-index: 33)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 18, SJR: 2.314, h-index: 130)
Advances in Computers     Full-text available via subscription   (Followers: 16, SJR: 0.223, h-index: 22)
Advances in Developmental Biology     Full-text available via subscription   (Followers: 11)
Advances in Digestive Medicine     Open Access   (Followers: 4)
Advances in DNA Sequence-Specific Agents     Full-text available via subscription   (Followers: 5)
Advances in Drug Research     Full-text available via subscription   (Followers: 22)
Advances in Ecological Research     Full-text available via subscription   (Followers: 39, SJR: 3.25, h-index: 43)
Advances in Engineering Software     Hybrid Journal   (Followers: 25, SJR: 0.486, h-index: 10)
Advances in Experimental Biology     Full-text available via subscription   (Followers: 7)
Advances in Experimental Social Psychology     Full-text available via subscription   (Followers: 38, SJR: 5.465, h-index: 64)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 3)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 8)
Advances in Food and Nutrition Research     Full-text available via subscription   (Followers: 41, SJR: 0.674, h-index: 38)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 14)
Advances in Genetics     Full-text available via subscription   (Followers: 15, SJR: 2.558, h-index: 54)
Advances in Genome Biology     Full-text available via subscription   (Followers: 11)
Advances in Geophysics     Full-text available via subscription   (Followers: 6, SJR: 2.325, h-index: 20)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 18, SJR: 0.906, h-index: 24)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8, SJR: 0.497, h-index: 31)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 22)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 2, SJR: 0.396, h-index: 27)
Advances in Immunology     Full-text available via subscription   (Followers: 33, SJR: 4.152, h-index: 85)
Advances in Inorganic Chemistry     Full-text available via subscription   (Followers: 9, SJR: 1.132, h-index: 42)
Advances in Insect Physiology     Full-text available via subscription   (Followers: 3, SJR: 1.274, h-index: 27)
Advances in Integrative Medicine     Hybrid Journal   (Followers: 4)
Advances in Intl. Accounting     Full-text available via subscription   (Followers: 4)
Advances in Life Course Research     Hybrid Journal   (Followers: 7, SJR: 0.764, h-index: 15)
Advances in Lipobiology     Full-text available via subscription   (Followers: 1)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 8)
Advances in Marine Biology     Full-text available via subscription   (Followers: 16, SJR: 1.645, h-index: 45)
Advances in Mathematics     Full-text available via subscription   (Followers: 10, SJR: 3.261, h-index: 65)
Advances in Medical Sciences     Hybrid Journal   (Followers: 5, SJR: 0.489, h-index: 25)
Advances in Medicinal Chemistry     Full-text available via subscription   (Followers: 5)
Advances in Microbial Physiology     Full-text available via subscription   (Followers: 4, SJR: 1.44, h-index: 51)
Advances in Molecular and Cell Biology     Full-text available via subscription   (Followers: 21)
Advances in Molecular and Cellular Endocrinology     Full-text available via subscription   (Followers: 10)
Advances in Molecular Toxicology     Full-text available via subscription   (Followers: 6, SJR: 0.324, h-index: 8)
Advances in Nanoporous Materials     Full-text available via subscription   (Followers: 3)
Advances in Oncobiology     Full-text available via subscription   (Followers: 3)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 15, SJR: 2.885, h-index: 45)
Advances in Parallel Computing     Full-text available via subscription   (Followers: 7, SJR: 0.148, h-index: 11)
Advances in Parasitology     Full-text available via subscription   (Followers: 7, SJR: 2.37, h-index: 73)
Advances in Pediatrics     Full-text available via subscription   (Followers: 20, SJR: 0.4, h-index: 28)
Advances in Pharmaceutical Sciences     Full-text available via subscription   (Followers: 14)
Advances in Pharmacology     Full-text available via subscription   (Followers: 13, SJR: 1.718, h-index: 58)
Advances in Physical Organic Chemistry     Full-text available via subscription   (Followers: 7, SJR: 0.384, h-index: 26)
Advances in Phytomedicine     Full-text available via subscription  
Advances in Planar Lipid Bilayers and Liposomes     Full-text available via subscription   (Followers: 3, SJR: 0.248, h-index: 11)
Advances in Plant Biochemistry and Molecular Biology     Full-text available via subscription   (Followers: 8)
Advances in Plant Pathology     Full-text available via subscription   (Followers: 5)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 18)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 17, SJR: 1.5, h-index: 62)
Advances in Psychology     Full-text available via subscription   (Followers: 56)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 5, SJR: 0.478, h-index: 32)
Advances in Radiation Oncology     Open Access  
Advances in Small Animal Medicine and Surgery     Hybrid Journal   (Followers: 1, SJR: 0.1, h-index: 2)
Advances in Space Research     Full-text available via subscription   (Followers: 332, SJR: 0.606, h-index: 65)
Advances in Structural Biology     Full-text available via subscription   (Followers: 7)
Advances in Surgery     Full-text available via subscription   (Followers: 6, SJR: 0.823, h-index: 27)
Advances in the Study of Behavior     Full-text available via subscription   (Followers: 28, SJR: 1.321, h-index: 56)
Advances in Veterinary Medicine     Full-text available via subscription   (Followers: 14)
Advances in Veterinary Science and Comparative Medicine     Full-text available via subscription   (Followers: 12)
Advances in Virus Research     Full-text available via subscription   (Followers: 5, SJR: 1.878, h-index: 68)
Advances in Water Resources     Hybrid Journal   (Followers: 42, SJR: 2.408, h-index: 94)
Aeolian Research     Hybrid Journal   (Followers: 5, SJR: 0.973, h-index: 22)
Aerospace Science and Technology     Hybrid Journal   (Followers: 303, SJR: 0.816, h-index: 49)
AEU - Intl. J. of Electronics and Communications     Hybrid Journal   (Followers: 8, SJR: 0.318, h-index: 36)
African J. of Emergency Medicine     Open Access   (Followers: 4, SJR: 0.344, h-index: 6)
Ageing Research Reviews     Hybrid Journal   (Followers: 7, SJR: 3.289, h-index: 78)
Aggression and Violent Behavior     Hybrid Journal   (Followers: 389, SJR: 1.385, h-index: 72)
Agri Gene     Hybrid Journal  
Agricultural and Forest Meteorology     Hybrid Journal   (Followers: 15, SJR: 2.18, h-index: 116)
Agricultural Systems     Hybrid Journal   (Followers: 29, SJR: 1.275, h-index: 74)
Agricultural Water Management     Hybrid Journal   (Followers: 36, SJR: 1.546, h-index: 79)
Agriculture and Agricultural Science Procedia     Open Access  
Agriculture and Natural Resources     Open Access   (Followers: 1)
Agriculture, Ecosystems & Environment     Hybrid Journal   (Followers: 48, SJR: 1.879, h-index: 120)
Ain Shams Engineering J.     Open Access   (Followers: 5, SJR: 0.434, h-index: 14)
Air Medical J.     Hybrid Journal   (Followers: 3, SJR: 0.234, h-index: 18)
AKCE Intl. J. of Graphs and Combinatorics     Open Access   (SJR: 0.285, h-index: 3)
Alcohol     Hybrid Journal   (Followers: 9, SJR: 0.922, h-index: 66)
Alcoholism and Drug Addiction     Open Access   (Followers: 5)
Alergologia Polska : Polish J. of Allergology     Full-text available via subscription   (Followers: 1)
Alexandria Engineering J.     Open Access   (Followers: 1, SJR: 0.436, h-index: 12)
Alexandria J. of Medicine     Open Access  
Algal Research     Partially Free   (Followers: 7, SJR: 2.05, h-index: 20)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 3)
Allergologia et Immunopathologia     Full-text available via subscription   (Followers: 1, SJR: 0.46, h-index: 29)
Allergology Intl.     Open Access   (Followers: 5, SJR: 0.776, h-index: 35)
ALTER - European J. of Disability Research / Revue Européenne de Recherche sur le Handicap     Full-text available via subscription   (Followers: 6, SJR: 0.158, h-index: 9)
Alzheimer's & Dementia     Hybrid Journal   (Followers: 45, SJR: 4.289, h-index: 64)
Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring     Open Access   (Followers: 5)
Alzheimer's & Dementia: Translational Research & Clinical Interventions     Open Access   (Followers: 3)
American Heart J.     Hybrid Journal   (Followers: 45, SJR: 3.157, h-index: 153)
American J. of Cardiology     Hybrid Journal   (Followers: 47, SJR: 2.063, h-index: 186)
American J. of Emergency Medicine     Hybrid Journal   (Followers: 34, SJR: 0.574, h-index: 65)
American J. of Geriatric Pharmacotherapy     Full-text available via subscription   (Followers: 6, SJR: 1.091, h-index: 45)
American J. of Geriatric Psychiatry     Hybrid Journal   (Followers: 14, SJR: 1.653, h-index: 93)
American J. of Human Genetics     Hybrid Journal   (Followers: 32, SJR: 8.769, h-index: 256)
American J. of Infection Control     Hybrid Journal   (Followers: 25, SJR: 1.259, h-index: 81)
American J. of Kidney Diseases     Hybrid Journal   (Followers: 31, SJR: 2.313, h-index: 172)
American J. of Medicine     Hybrid Journal   (Followers: 48, SJR: 2.023, h-index: 189)
American J. of Medicine Supplements     Full-text available via subscription   (Followers: 3)
American J. of Obstetrics and Gynecology     Hybrid Journal   (Followers: 173, SJR: 2.255, h-index: 171)
American J. of Ophthalmology     Hybrid Journal   (Followers: 51, SJR: 2.803, h-index: 148)
American J. of Ophthalmology Case Reports     Open Access   (Followers: 2)
American J. of Orthodontics and Dentofacial Orthopedics     Full-text available via subscription   (Followers: 6, SJR: 1.249, h-index: 88)
American J. of Otolaryngology     Hybrid Journal   (Followers: 22, SJR: 0.59, h-index: 45)
American J. of Pathology     Hybrid Journal   (Followers: 23, SJR: 2.653, h-index: 228)
American J. of Preventive Medicine     Hybrid Journal   (Followers: 21, SJR: 2.764, h-index: 154)
American J. of Surgery     Hybrid Journal   (Followers: 32, SJR: 1.286, h-index: 125)
American J. of the Medical Sciences     Hybrid Journal   (Followers: 13, SJR: 0.653, h-index: 70)
Ampersand : An Intl. J. of General and Applied Linguistics     Open Access   (Followers: 5)
Anaerobe     Hybrid Journal   (Followers: 4, SJR: 1.066, h-index: 51)
Anaesthesia & Intensive Care Medicine     Full-text available via subscription   (Followers: 52, SJR: 0.124, h-index: 9)
Anaesthesia Critical Care & Pain Medicine     Full-text available via subscription   (Followers: 3)
Anales de Cirugia Vascular     Full-text available via subscription  
Anales de Pediatría     Full-text available via subscription   (Followers: 2, SJR: 0.209, h-index: 27)
Anales de Pediatría (English Edition)     Full-text available via subscription  
Anales de Pediatría Continuada     Full-text available via subscription   (SJR: 0.104, h-index: 3)
Analytic Methods in Accident Research     Hybrid Journal   (Followers: 2, SJR: 2.577, h-index: 7)
Analytica Chimica Acta     Hybrid Journal   (Followers: 38, SJR: 1.548, h-index: 152)
Analytical Biochemistry     Hybrid Journal   (Followers: 152, SJR: 0.725, h-index: 154)
Analytical Chemistry Research     Open Access   (Followers: 7, SJR: 0.18, h-index: 2)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 10)
Anesthésie & Réanimation     Full-text available via subscription  
Anesthesiology Clinics     Full-text available via subscription   (Followers: 21, SJR: 0.421, h-index: 40)
Angiología     Full-text available via subscription   (SJR: 0.124, h-index: 9)
Angiologia e Cirurgia Vascular     Open Access  
Animal Behaviour     Hybrid Journal   (Followers: 141, SJR: 1.907, h-index: 126)
Animal Feed Science and Technology     Hybrid Journal   (Followers: 5, SJR: 1.151, h-index: 83)
Animal Reproduction Science     Hybrid Journal   (Followers: 5, SJR: 0.711, h-index: 78)
Annales d'Endocrinologie     Full-text available via subscription   (SJR: 0.394, h-index: 30)
Annales d'Urologie     Full-text available via subscription  
Annales de Cardiologie et d'Angéiologie     Full-text available via subscription   (SJR: 0.177, h-index: 13)
Annales de Chirurgie de la Main et du Membre Supérieur     Full-text available via subscription  
Annales de Chirurgie Plastique Esthétique     Full-text available via subscription   (Followers: 2, SJR: 0.354, h-index: 22)
Annales de Chirurgie Vasculaire     Full-text available via subscription   (Followers: 1)

        1 2 3 4 5 6 7 8 | Last   [Sort by number of followers]   [Restore default list]

Journal Cover Acta Mechanica Solida Sinica
  [SJR: 0.442]   [H-I: 21]   [9 followers]  Follow
    
   Full-text available via subscription Subscription journal  (Not entitled to full-text)
   ISSN (Print) 0894-9166 - ISSN (Online) 1860-2134
   Published by Elsevier Homepage  [3031 journals]
  • Natural Frequency and Stability Tuning of Cantilevered CNTs Conveying
           Fluid in Magnetic Field
    • Authors: Lin Wang; Yuanzhuo Hong; Huliang Dai; Qiao Ni
      Pages: 567 - 576
      Abstract: Publication date: December 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 6
      Author(s): Lin Wang, Yuanzhuo Hong, Huliang Dai, Qiao Ni
      This paper investigates the dynamics of cantilevered CNTs conveying fluid in longitudinal magnetic field and presents the possibility of controlling/tuning the stability of the CNT system with the aid of magnetic field. The slender CNT is treated as an Euler-Bernoulli beam. Based on nonlocal elasticity theory, the equation of motion with consideration of magnetic field effect is developed. This partial differential equation is then discretized using the differential quadrature method (DQM). Numerical results show that the nonlocal small-scale parameter makes the fluid-conveying CNT more flexible and can shift the unstable mode in which flutter instability occurs first at sufficiently high flow velocity from one to another. More importantly, the addition of a longitudinal magnetic field leads to much richer dynamical behaviors of the CNT system. Indeed, the presence of longitudinal magnetic field can significantly affect the evolution of natural frequency of the dynamical system when the flow velocity is successively increased. With increasing magnetic field parameter, it is shown that the CNT system behaves stiffer and hence the critical flow velocity becomes higher. It is of particular interest that when the magnetic field parameter is equal to or larger than the flow velocity, the cantilevered CNT conveying fluid becomes unconditionally stable, indicating that the dynamic stability of the system can be controlled due to the presence of a longitudinal magnetic field.

      PubDate: 2017-01-01T00:16:05Z
      DOI: 10.1016/s0894-9166(16)30328-7
       
  • A Unified Solution for the Free Vibration Analysis of Simply Supported
           Cylindrical Shells with General Structural Stress Distributions
    • Authors: Nian Yang; Luyun Chen; Hong Yi; Yong Liu
      Pages: 577 - 595
      Abstract: Publication date: December 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 6
      Author(s): Nian Yang, Luyun Chen, Hong Yi, Yong Liu
      Most existing studies on the vibration analysis of cylindrical shells with structural stress are limited to uniform stress distribution. However, non-uniform stress distributions are encountered in many engineering applications. In this study, a unified solution for the vibration analysis of cylindrical shells with a general stress distribution is presented using the Flügge shell theory and modal orthogonality simplification. The obtained analytical solution can be applied to a structure with arbitrary distributed stress, thus it has a wider range of applications than previous methods. The accuracy and advantage of the proposed method are validated by comparing with the finite element method results.

      PubDate: 2017-01-01T00:16:05Z
      DOI: 10.1016/s0894-9166(16)30329-9
       
  • Damage Evolution and Crack Propagation in Semicircular Bending Asphalt
           Mixture Specimens
    • Authors: Guowei Zeng; Xinhua Yang; Long Chen; Fan Bai
      Pages: 596 - 609
      Abstract: Publication date: December 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 6
      Author(s): Guowei Zeng, Xinhua Yang, Long Chen, Fan Bai
      The damage and fracture behaviors of semicircular bending (SCB) asphalt mixture specimens with different orientation notches are experimentally and numerically investigated. In the numerical simulations, asphalt mixture is modeled as a two-phase material, namely a mix of coarse aggregates and asphalt mastic, and the mechanical behavior of asphalt mastic is characterized with the damage constitutive model and the damage-based fracture criterion. Some SCB experiments are performed on the asphalt mixture specimens with different orientation notches to validate the numerical method. Finally, the effects of notch orientation and aggregate distribution on crack path, damage distribution, and the load vs. displacement relation are numerically evaluated.

      PubDate: 2017-01-01T00:16:05Z
      DOI: 10.1016/s0894-9166(16)30330-5
       
  • An Internal Expansive Stress Model of Concrete under Sulfate Attack
    • Authors: Hui Song; Jiankang Chen; Jinyang Jiang
      Pages: 610 - 619
      Abstract: Publication date: December 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 6
      Author(s): Hui Song, Jiankang Chen, Jinyang Jiang
      Concrete experiences expansive deformation during sulfate attack due to internal expansive stress. Sulfate ions enter concrete pores, react with the pore solution, and produce ettringite. The production of ettringite explains the internal expansive stress that reduces the durability of concrete. In this study, the model of internal expansive stress was achieved through the Eshelby's theory, as well as the experimental results for concrete erosion. Numerical simulation indicated that internal expansive stress is not only determined by the water-to-cement ratio of concrete and the concentration of sulfate solution, but also affected by the relaxation time of concrete.

      PubDate: 2017-01-01T00:16:05Z
      DOI: 10.1016/s0894-9166(16)30331-7
       
  • Analysis of Coupled Vibration Characteristics of Wind Turbine Blade Based
           on Green's Functions
    • Authors: Liang Li; Xuanling Zhang; Yinghui Li
      Pages: 620 - 630
      Abstract: Publication date: December 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 6
      Author(s): Liang Li, Xuanling Zhang, Yinghui Li
      This paper presents the analysis of dynamic characteristics of horizontal axis wind turbine blade, where the mode coupling among axial extension, flap vibration (out-of-plane bending), lead/lag vibration (in-plane bending) and torsion is emphasized. By using the Bernoulli-Euler beam to describe the slender blade which is mounted on rigid hub and subjected to unsteady aerodynamic force, the governing equation and characteristic equation of the coupled vibration of the blade are obtained. Due to the combined influences of mode coupling, centrifugal effect, and the non-uniform distribution of mass and stiffness, the explicit solution of characteristic equation is impossible to obtain. An equivalent transformation based on Green's functions is taken for the characteristic equation, and then a system of integrodifferential equations is derived. The numerical difference methods are adopted to solve the integrodifferential equations to get natural frequencies and mode shapes. The influences of mode coupling, centrifugal effect, and rotational speed on natural frequencies and mode shapes are analyzed. Results show that: (1) the influence of bending-torsion coupling on natural frequency is tiny; (2) rotation has dramatic influence on bending frequency but little influence on torsion frequency; (3) the influence of bending-bending coupling on dynamic characteristics is notable at high rotational speed; (4) the effect of rotational speed on bending mode is tiny.

      PubDate: 2017-01-01T00:16:05Z
      DOI: 10.1016/s0894-9166(16)30332-9
       
  • Structure-preserving Analysis on Folding and Unfolding Process of
           Undercarriage
    • Authors: Weipeng Hu; Mingzhe Song; Zichen Deng; Xindong Wang; Zhiwei Xiong
      Pages: 631 - 641
      Abstract: Publication date: December 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 6
      Author(s): Weipeng Hu, Mingzhe Song, Zichen Deng, Xindong Wang, Zhiwei Xiong
      The main idea of the structure-preserving method is to preserve the intrinsic geometric properties of the continuous system as much as possible in numerical algorithm design. The geometric constraint in the multi-body systems, one of the difficulties in the numerical methods that are proposed for the multi-body systems, can also be regarded as a geometric property of the multi-body systems. Based on this idea, the symplectic precise integration method is applied in this paper to analyze the kinematics problem of folding and unfolding process of nose undercarriage. The Lagrange governing equation is established for the folding and unfolding process of nose undercarriage with the generalized defined displacements firstly. And then, the constrained Hamiltonian canonical form is derived from the Lagrange governing equation based on the Hamiltonian variational principle. Finally, the symplectic precise integration scheme is used to simulate the kinematics process of nose undercarriage during folding and unfolding described by the constrained Hamiltonian canonical formulation. From the numerical results, it can be concluded that the geometric constraint of the undercarriage system can be preserved well during the numerical simulation on the folding and unfolding process of undercarriage using the symplectic precise integration method.

      PubDate: 2017-01-01T00:16:05Z
      DOI: 10.1016/s0894-9166(16)30333-0
       
  • Finite Spherical Cavity Expansion Method for Layering Effect
    • Authors: Xiangzhen Kong; Qin Fang; Hao Wu; Yadong Zhang
      Pages: 642 - 654
      Abstract: Publication date: December 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 6
      Author(s): Xiangzhen Kong, Qin Fang, Hao Wu, Yadong Zhang
      A decay function for the layering effect during the projectile penetrating into layered targets is constructed, which is obtained via the theoretical solution of a dynamically expanding layered spherical cavity with finite radius in the layered targets that are assumed to be incompressible Mohr-Coulomb materials. By multiplying the decay function with the semi-empirical forcing functions that account for all the constitutive behavior of the targets, the forcing functions for the layered targets are obtained. Then, the forcing functions are used to represent the targets and are applied on the projectile surface as the pressure boundary condition where the projectile is modeled by an explicit transient dynamic finite element code. This methodology is implemented into ABAQUS explicit solver via the user subroutine VDLOAD, which eliminates the need for discretizing the targets and the need for the complex contact algorithm. In order to verify the proposed layering effect model, depth-of-penetration experiments of the 37 mm hard core projectile penetrating into three sets of fiber concrete and soil layered targets are conducted. The predicted depths of penetration show good agreement with the experimental data. Furthermore, the influence of layering effect on projectile trajectory during earth penetration is investigated. It is found that the layering effect should be taken into account if the final position and trajectory of the projectile are the main concern.

      PubDate: 2017-01-01T00:16:05Z
      DOI: 10.1016/s0894-9166(16)30334-2
       
  • Micromechanical Modeling of Elastic-Viscoplastic Behavior of Armco-Fe at
           High Strain Rate
    • Authors: Zhiyong Huang; Haomin Wang; Qingyuan Wang; Muhammad Kashif Khan
      Pages: 655 - 662
      Abstract: Publication date: December 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 6
      Author(s): Zhiyong Huang, Haomin Wang, Qingyuan Wang, Muhammad Kashif Khan
      Heterogeneous dynamical stress-strain response of Armco-Fe was investigated at high strain rates through the Split Hopkinson Pressure Bar (SHPB) testing. It was found that the viscoplastic deformation in BCC ferrite grains is affected by the strain rate. Thermal softening and variation in crystal orientations under high-strain-rate loading were used in the elastic-viscoplastic modeling. The micromechanical analysis with self-consistent transition and homogenization was used for estimation of the global impact response of the material. The results from modeling were found in good agreement with the experimental data.

      PubDate: 2017-01-01T00:16:05Z
      DOI: 10.1016/s0894-9166(16)30335-4
       
  • Concurrent Analysis and Design of Structure and Its Periodic Materials
    • Authors: Xianjie Wang; Yun Qin; Xun'an Zhang
      Pages: 663 - 674
      Abstract: Publication date: December 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 6
      Author(s): Xianjie Wang, Yun Qin, Xun'an Zhang
      The specific good properties of cellular materials and composite materials, such as low density and high permeability, make the optimal design of such materials necessary and attractive. However, the given materials for the structures may not be optimal or suitable since the boundary condition and applied loads vary in practical applications; hence the macro-structure and its material micro-structure should be considered simultaneously. Although abundant studies have been reported on the structural and material optimization at each level, very few of them considered the mutual coordination on both scales. In this paper, two FE models are built for the macro-structure and the micro-structure, respectively; and the effective elastic properties of the periodic micro-structure are blended into the analysis of macro-structure by the homogenization theory. Here, a topological optimum is obtained by gradually re-distributing the constituents within the micro-structure and updating the topological shape at the macro-structure until converges are achieved on both scales. The mutual coordination between the roles of micro-scale and macro-scale is considered. Some numerical examples are presented, which illustrate that the proposed optimization algorithm is effective and highly efficient for the micro-structure design and macro-structure optimization. For the composite design, one can see reasonable effects of the stiffness of base materials on the resultant topologies.

      PubDate: 2017-01-01T00:16:05Z
      DOI: 10.1016/s0894-9166(16)30336-6
       
  • NMolecular dynamics simulation of diffusion of nanoparticles in mucus
    • Authors: Jiuling Wang; Xinghua Shi
      Abstract: Publication date: Available online 6 April 2017
      Source:Acta Mechanica Solida Sinica
      Author(s): Jiuling Wang, Xinghua Shi
      The rapid diffusion of nanoparticles (NPs) through mucus layer is critical for efficient transportation of NPs-loaded drug delivery system. To understand how the physical and surface properties of NPs affect their diffusion in mucus, we have developed a coarse-grained molecular dynamics model to study the diffusion of NPs in modeled mucus layer. Both steric obstruction and hydrodynamic interaction are included in the model capable of capturing the key characteristics of NPs’ diffusion in mucus. The results show that both particle size and surface properties significantly affect the diffusivities of NPs in mucus. Furthermore, we find rodlike NPs can gain a higher diffusivity than spherical NPs with the same hydrodynamic diameter. In addition, the disturbed environment can enhance the diffusivity of NPs. Our findings can be utilized to design mucus penetrating NPs for targeted drug delivery system.

      PubDate: 2017-04-09T04:39:07Z
      DOI: 10.1016/j.camss.2017.03.012
       
  • NMolecular dynamics simulation of diffusion of nanoparticles in mucus
    • Authors: Jiuling Wang; Xinghua Shi
      Abstract: Publication date: Available online 6 April 2017
      Source:Acta Mechanica Solida Sinica
      Author(s): Jiuling Wang, Xinghua Shi
      The rapid diffusion of nanoparticles (NPs) through mucus layer is critical for efficient transportation of NPs-loaded drug delivery system. To understand how the physical and surface properties of NPs affect their diffusion in mucus, we have developed a coarse-grained molecular dynamics model to study the diffusion of NPs in modeled mucus layer. Both steric obstruction and hydrodynamic interaction are included in the model capable of capturing the key characteristics of NPs’ diffusion in mucus. The results show that both particle size and surface properties significantly affect the diffusivities of NPs in mucus. Furthermore, we find rodlike NPs can gain a higher diffusivity than spherical NPs with the same hydrodynamic diameter. In addition, the disturbed environment can enhance the diffusivity of NPs. Our findings can be utilized to design mucus penetrating NPs for targeted drug delivery system.

      PubDate: 2017-04-09T04:39:07Z
      DOI: 10.1016/j.camss.2017.03.012
       
  • Lithiation-Enhanced Charge Transfer and Sliding Strength at the
           Silicon-Graphene Interface: a First-Principles Study
    • Authors: Cheng Chang; Xiaoyan Li; Zhiping Xu; Huajian Gao
      Abstract: Publication date: Available online 31 March 2017
      Source:Acta Mechanica Solida Sinica
      Author(s): Cheng Chang, Xiaoyan Li, Zhiping Xu, Huajian Gao
      The application of silicon as ultrahigh capacity electrodes in lithium-ion batteries has been limited by a number of mechanical degradation mechanisms including fracture, delamination and plastic ratcheting, as a result of its large volumetric change during lithiation and delithiation. Graphene coating is one feasible technique to mitigate the mechanical degradation of Si anode and improve its conductivity. In this paper, first-principles calculations are performed to study the atomic structure, charge transfer and sliding strength of the interface between lithiated silicon and graphene. Our results show that Li atoms segregate at the (lithiated) Si-graphene interface preferentially, donating electrons to graphene and enhancing the interfacial sliding resistance. Moreover, the interfacial cohesion and sliding strength can be further enhanced by introducing single-vacancy defects into graphene. These findings provide insights that can guide the design of stable and efficient anodes of silicon/graphene hybrids for energy storage applications.

      PubDate: 2017-04-01T12:35:53Z
      DOI: 10.1016/j.camss.2017.03.011
       
  • Band Structure Properties of Elastic Waves Propagating in the Nanoscaled
           Nearly Periodic Layered Phononic Crystals
    • Authors: A-Li Chen; Li-Zhi Tian; Yue-Sheng Wang
      Abstract: Publication date: Available online 22 March 2017
      Source:Acta Mechanica Solida Sinica
      Author(s): A-Li Chen, Li-Zhi Tian, Yue-Sheng Wang
      The localization factor is used to describe the band structures for P wave propagating normally in the nanoscaled nearly periodic layered phononic crystals. The localization factor is calculated by the transfer matrix method based on the nonlocal elastic continuum theory. Three kinds of nearly periodic arrangements are concerned, i.e., random disorder, quasi-periodicity and defects. The influences of randomly disordered degree of the sub-layer's thickness and mass density, the arrangement of quasi-periodicity and the location of defect on the band structures and cut-off frequency are analyzed in detail.

      PubDate: 2017-04-01T12:35:53Z
      DOI: 10.1016/j.camss.2017.03.005
       
  • Numerical simulation of quasi-static compression on a complex rubber foam
    • Authors: Huyi Wang; Wenjun Hu; Fengpeng Zhao
      Abstract: Publication date: Available online 22 March 2017
      Source:Acta Mechanica Solida Sinica
      Author(s): Huyi Wang, Wenjun Hu, Fengpeng Zhao
      A complex rubber foam under quasi-static compression is simulated using the finite element method (FEM). The present work sets up the phenomenological constitutive model for the silicon rubber. The computerized tomography (CT) technique is utilized to reconstruct the real complex foam geometries. The quasi-static uniaxial compression on the foam is simulated in ABAQUS. The present work obtains the stress response as the nominal strain nearly reaches 80% and the foam exhibits hyper-elastic behavior. The FEM results achieve good agreements with the data obtained from the multi-scale simulation and the tests as the nominal strain is less than 60%.

      PubDate: 2017-04-01T12:35:53Z
      DOI: 10.1016/j.camss.2017.03.009
       
  • A simplified fatigue assessment method for transverse fillet welded joints
    • Authors: Wei Shen; Renjun Yan; Nigel Barltrop; Kai Qin; Feng He
      Abstract: Publication date: Available online 22 March 2017
      Source:Acta Mechanica Solida Sinica
      Author(s): Wei Shen, Renjun Yan, Nigel Barltrop, Kai Qin, Feng He
      In the as-welded condition the fatigue crack initiation period was considered non-existent and Linear Elastic Fracture Mechanics (LEFM) was used to calculate fatigue strength for a range of weld geometries. Fracture mechanics assessment of welded joints requires accurate solutions for stress intensity factor (SIF). However, the solutions for the SIF of complex welded joints are difficult to determine due to the complicated correction factors. Three methods for SIF prediction are discussed on fillet welded specimens containing continuous or semi-elliptical surface cracks, including the traditional correction method Mk , the approximate correction method Kt , and the suggested additional crack size method (ac+ae). The new additional crack parameter ae is used to replace the stress concentration effect of weld profile Mk , which simplifies the calculation process. Experimental results are collected to support fatigue strength assessment of the additional crack size method.

      PubDate: 2017-04-01T12:35:53Z
      DOI: 10.1016/j.camss.2017.03.001
       
  • Frequency-dependent random fatigue of panel-type structures made of
           ceramic matrix composites
    • Authors: Yadong Zhou; Xiaochen Hang; Shaoqing Wu; Qingguo Fei; Natasa Trisovic
      Abstract: Publication date: Available online 22 March 2017
      Source:Acta Mechanica Solida Sinica
      Author(s): Yadong Zhou, Xiaochen Hang, Shaoqing Wu, Qingguo Fei, Natasa Trisovic
      The panel-type structures used in aerospace engineering can be subjected to severe high-frequency acoustic loadings in service. This paper evaluates the frequency-dependent random fatigue of panel-type structures made of ceramic matrix composites (CMCs) under acoustic loadings. Firstly, the high-frequency random responses from the broadband random excitation will result in more stress cycles in a definite period of time. The probability density distributions of stress amplitudes will be different in different frequency bandwidths, though the peak stress estimations are identical. Secondly, the fatigue properties of CMCs can be highly frequency-dependent. The fatigue evaluation method for the random vibration case is adopted to evaluate the fatigue damage of a representative stiffened panel structure. The frequency effect through S-N curves on random fatigue damage is numerically verified. Finally, a parameter is demonstrated to characterize the mean vibration frequency of a random process, and hence this parameter can further be considered as a reasonable loading frequency in the fatigue tests of CMCs to obtain more reliable S-N curves. Therefore, the influence of vibration frequency can be incorporated in the random fatigue model from the two perspectives.

      PubDate: 2017-04-01T12:35:53Z
      DOI: 10.1016/j.camss.2017.03.010
       
  • Nonstationary plane contact problem in theory of elasticity for conformal
           cylindrical surfaces
    • Authors: Veniamin D. Kubenko; Ihor V. Yanchevskyi
      Abstract: Publication date: Available online 22 March 2017
      Source:Acta Mechanica Solida Sinica
      Author(s): Veniamin D. Kubenko, Ihor V. Yanchevskyi
      A numerical-analytical approach is described to investigate the process of impact interaction between a long smooth rigid body and the surface of a circular cylindrical cavity in elastic space. A non-stationary mixed initial boundary value problem is formulated with a priori unknown boundaries moving with variable velocity. The problem is solved using the methods of the theory of integral transforms, expansion of desired variables into a Fourier series, and the quadrature method to reduce the problem to solving a system of linear algebraic equations at each time step. Some concrete numerical computations are presented. The cylindrical body mass and radius impact on the profile of the transient process of contact interaction has been analysed.

      PubDate: 2017-04-01T12:35:53Z
      DOI: 10.1016/j.camss.2017.03.002
       
  • Reflection of Elastic Waves at the Elastically Supported Boundary of a
           Couple Stress Elastic Half-space
    • Authors: Changda Wang; Xuejun Chen; Peijun Wei; Yueqiu Li
      Abstract: Publication date: Available online 22 March 2017
      Source:Acta Mechanica Solida Sinica
      Author(s): Changda Wang, Xuejun Chen, Peijun Wei, Yueqiu Li
      The reflection elastic waves at the elastically supported boundary of a couple stress elastic half-space are studied in this paper. Different from the classical elastic solid, there are three kinds of elastic waves in the couple stress elastic solid, and two of them are dispersive. The boundary conditions of a couple stress elastic half-space include the couple stress vector and the rotation vector which disappear in the classical elastic solids. These boundary conditions are used to obtain a linear algebraic equation set, from which the amplitude ratios of reflection waves to the incident wave can be determined. Then, the reflection coefficients in terms of energy flux ratios are calculated numerically, and the normal energy flux conservation is used to validate the numerical results. Based on these numerical results, the influences of the boundary parameters, which reflect the mechanical behavior of elastic support, on the reflection energy partition are discussed. Both the incident longitudinal wave (the P wave) and incident transverse wave (the SV wave) are considered.

      PubDate: 2017-04-01T12:35:53Z
      DOI: 10.1016/j.camss.2017.03.004
       
  • SHEAR RESPONSE OF β-SIC BULK DEPENDENT ON TEMPERATURE AND STRAIN RATE
    • Authors: Liang Wang; Qunfeng Liu; Wenshan Yu; Shengping Shen
      Abstract: Publication date: Available online 22 March 2017
      Source:Acta Mechanica Solida Sinica
      Author(s): Liang Wang, Qunfeng Liu, Wenshan Yu, Shengping Shen
      The shear responses of β-SiC are investigated using molecular dynamics simulation with the Tersoff interatomic potential. Results show a clear decreasing trend in critical stress, fracture strain and shear modulus as temperature increases. Above a critical temperature, β-SiC bulk just fractures after the elastic deformation. However, below the critical temperature, an interesting pattern in β-SiC bulk emerges due to the elongation of Si-C bonds before fracture. Additionally, the shear deformation of β-SiC at room temperature is found to be dependent on the strain rate. This study may shed light on the deformation mechanism dependent on temperature and strain rate.

      PubDate: 2017-04-01T12:35:53Z
      DOI: 10.1016/j.camss.2017.03.008
       
  • A Refined Global-Local Approach for Evaluation of Singular Stress Field
           Based on Scaled Boundary Finite Element Method
    • Authors: Lin Pang; Gao Lin; Zhiqiang Hu
      Abstract: Publication date: Available online 22 March 2017
      Source:Acta Mechanica Solida Sinica
      Author(s): Lin Pang, Gao Lin, Zhiqiang Hu
      A refined global-local approach based on the scaled boundary finite element method (SBFEM) is proposed to improve the accuracy of predicted singular stress field. The proposed approach is carried out in conjunction with two steps. First, the entire structure is analyzed by employing an arbitrary numerical method. Then, the interested region, which contains stress singularity, is re-solved using the SBFEM by placing the scaling center right at the singular stress point with the boundary conditions evaluated from the first step imposed along the whole boundary including the side-faces. Benefiting from the semi-analytical nature of the SBFEM, the singular stress field can be predicted accurately without highly refined meshes. It provides the FEM or other numerical methods with a rather simple and convenient way to improve the accuracy of stress analysis. Numerical examples validate the effectiveness of the proposed approach in dealing with various kinds of problems.

      PubDate: 2017-04-01T12:35:53Z
      DOI: 10.1016/j.camss.2017.03.006
       
  • Static response of a layered magneto-electro-elastic half-space structure
           under circular surface loading
    • Authors: Jiangyi Chen; Junhong Guo
      Abstract: Publication date: Available online 22 March 2017
      Source:Acta Mechanica Solida Sinica
      Author(s): Jiangyi Chen, Junhong Guo
      A cylindrical system of vector functions, the stiffness matrix method and the corresponding recursive algorithm are proposed to investigate the static response of transversely isotropic, layered magneto-electro-elastic (MEE) structures over a homogeneous half-space substrate subjected to circular surface loading. In terms of the system of vector functions, we expand the extended displacement and stresses, and deduce two sets of ordinary differential equations, which are related to the expansion coefficients. The solution to one of the two sets of these ordinary differential equations can be evaluated by using the stiffness matrix method and the corresponding recursive algorithm. These expansion coefficients are then integrated by adaptive Gaussian quadrature to obtain the displacements and stresses in the physical domain. Two types of surface loads, mechanical pressure and electric loading, are considered in the numerical examples. The calculated results show that the proposed technique is stable and effective in analyzing the layered half-space MEE structures under surface loading.

      PubDate: 2017-04-01T12:35:53Z
      DOI: 10.1016/j.camss.2017.03.003
       
  • A comparative study of wave localization in locally resonant Thue-Morse,
           Rudin-Shapiro and Period-Doubling aperiodic structures
    • Authors: Zhizhong Yan; Yangyang Wang; Chuanzeng Zhang
      Abstract: Publication date: Available online 22 March 2017
      Source:Acta Mechanica Solida Sinica
      Author(s): Zhizhong Yan, Yangyang Wang, Chuanzeng Zhang
      The localization characteristics of the in-plane elastic waves in locally resonant aperiodic phononic crystals are examined in this study. In particular, the phononic crystals generated according to the Thue-Morse, Rudin-Shapiro and Period-Doubling sequences are theoretically investigated by using the extended transfer matrix method. For comparison, the binary and ternary locally resonant systems are considered, and their band structures are characterized by using the localization factors. Moreover, the influences of structural arrangement, material combination, incidence angle, number of components, length ratio, and random disorder on the band structures are also discussed. Some novel and interesting phenomena are observed and discussed.

      PubDate: 2017-04-01T12:35:53Z
      DOI: 10.1016/j.camss.2017.03.007
       
  • Interaction between a screw dislocation and a circular nano-inhomogeneity
           with a bimaterial interface
    • Authors: Tengwu He; Wanshen Xiao; Xiangdong Li; Yan Zhang
      Abstract: Publication date: Available online 16 February 2017
      Source:Acta Mechanica Solida Sinica
      Author(s): Tengwu He, Wanshen Xiao, Xiangdong Li, Yan Zhang
      The problem of a screw dislocation interacting with a circular nano-inhomogeneity near a bimaterial interface is investigated. The stress boundary condition at the interface between the inhomogeneity and the matrix is modified by incorporating surface/interface stress. The analytical solutions to the problem in explicit series are obtained by an efficient complex variable method associated with the conformal mapping function. The image force exerted on the screw dislocation is also derived using the generalized Peach-Koehler formula. The results indicate that the elastic interference of the screw dislocation and the nano-inhomogeneity is strongly affected by a combination of material elastic dissimilarity, the radius of the inclusion, the distance from the center of inclusion to the bimaterial interface, and the surface/interface stress between the inclusion and the matrix. Additionally, it is found that when the inclusion and Material 3 are both harder than the matrix (μ1 > μ2 and μ3 > μ2), a new stable equilibrium position for the screw dislocation in the matrix appears near the bimaterial interface; when the inclusion and Material 3 are both softer than the matrix (μ1 < μ2 and μ3 < μ2), a new unstable equilibrium position exists close to the bimaterial interface.

      PubDate: 2017-02-18T19:00:18Z
      DOI: 10.1016/j.camss.2016.08.001
       
  • ANALYSES OF DYNAMIC CHARACTERISTICS OF A FLUID-FILLED THIN RECTANGULAR
           POROUS PLATE WITH VARIOUS BOUNDARY CONDITIONS
    • Authors: Yu Xiang; Honghua Jiang; Jing Lu
      Abstract: Publication date: Available online 16 February 2017
      Source:Acta Mechanica Solida Sinica
      Author(s): Yu Xiang, Honghua Jiang, Jing Lu
      Based on the classical theory of thin plate and Biot theory, a precise model of the transverse vibrations of a thin rectangular porous plate is proposed. The first order differential equations of the porous plate are derived in the frequency domain. By considering the coupling effect between the solid phase and the fluid phase and without any hypothesis for the fluid displacement, the model presented here is rigorous and close to the real materials. Owing to the use of extended homogeneous capacity precision integration method and precise element method, the model can be applied in higher frequency range than pure numerical methods. This model also easily adapts to various boundary conditions. Numerical results are given for two different porous plates under different excitations and boundary conditions.

      PubDate: 2017-02-18T19:00:18Z
      DOI: 10.1016/j.camss.2016.12.002
       
  • Nonlinear buckling and postbuckling behavior of cylindrical shear
           deformable nanoshells subjected to radial compression including surface
           free energy effects
    • Authors: S. Sahmani; M.M. Aghdam; M. Bahrami
      Abstract: Publication date: Available online 13 February 2017
      Source:Acta Mechanica Solida Sinica
      Author(s): S. Sahmani, M.M. Aghdam, M. Bahrami
      The objective of the present investigation is to predict the nonlinear buckling and postbuckling characteristics of cylindrical shear deformable nanoshells with and without initial imperfection under hydrostatic pressure load in the presence of surface free energy effects. To this end, Gurtin-Murdoch elasticity theory is implemented into the first-order shear deformation shell theory to develop a size-dependent shell model which has an excellent capability to take surface free energy effects into account. A linear variation through the shell thickness is assumed for the normal stress component of the bulk to satisfy the equilibrium conditions on the surfaces of nanoshell. On the basis of variational approach and using von Karman-Donnell-type of kinematic nonlinearity, the non-classical governing differential equations are derived. Then a boundary layer theory of shell buckling is employed incorporating the effects of surface free energy in conjunction with nonlinear prebuckling deformations, large deflections in the postbuckling domain and initial geometric imperfection. Finally, an efficient solution methodology based on a two-stepped singular perturbation technique is put to use in order to obtain the critical buckling loads and postbuckling equilibrium paths corresponding to various geometric parameters. It is demonstrated that the surface free energy effects cause increases in both the critical buckling pressure and critical end-shortening of a nanoshell made of Silicon.

      PubDate: 2017-02-13T17:02:22Z
      DOI: 10.1016/j.camss.2017.02.002
       
  • Stochastic Averaging of Quasi Integrable and resonant Hamiltonian Systems
           Excited by Fractional Gaussian Noise with Hurst index 1/2
    • Authors: Q.F. Lü; M.L. Deng; W.Q. Zhu
      Abstract: Publication date: Available online 10 February 2017
      Source:Acta Mechanica Solida Sinica
      Author(s): Q.F. Lü, M.L. Deng, W.Q. Zhu
      A stochastic averaging method of quasi integrable and resonant Hamiltonian systems under excitation of fractional Gaussian noise (fGn) with the Hurst index 1/2 < H < 1 is proposed. First, the definition and the basic property of fGn and related fractional Brownian motion (fBm) are briefly introduced. Then, the averaged fractional stochastic differential equations (SDEs) for the first integrals and combinations of angle variables of the associated Hamiltonian systems are derived. The stationary probability density and statistics of the original systems are then obtained approximately by simulating the averaged SDEs numerically. An example is worked out to illustrate the proposed stochastic averaging method. It is shown that the results obtained by using the proposed stochastic averaging method and those from digital simulation of original system agree well.

      PubDate: 2017-02-13T17:02:22Z
      DOI: 10.1016/j.camss.2016.05.002
       
  • Nondestructive Testing Method Based on Lamb Waves for Localization and
           Extent of Damage#
    • Authors: Jianlin Chen; Zheng Li; Kezhuang Gong
      Abstract: Publication date: Available online 10 February 2017
      Source:Acta Mechanica Solida Sinica
      Author(s): Jianlin Chen, Zheng Li, Kezhuang Gong
      Based on Lamb wave analysis of propagation in plate-like structures, a damage detection method is proposed that not only locates the position of the damage accurately but also estimates its size. Similar damage detection methods focus only on localization giving no quantitative estimation of extent. To improve detection, we propose two predictive circle methods for size estimation. Numerical simulations and experiments were performed for an aluminum plate with a hole. Two PZT configurations of different sizes were designed to excite and detect Lamb waves. From cross-correlation analysis, the damage location and extent can be determined. Results obtained using the proposed method enable a better quantitative resolution in detection, and the size of the inspection area influences the accuracy of damage identification. The closer to the damage, the more accurate the results are. The method proposed can be developed into a multiple-step detection method for multi-scale analysis with prospective accuracy.

      PubDate: 2017-02-13T17:02:22Z
      DOI: 10.1016/j.camss.2016.06.001
       
  • A size-dependent composite laminated skew plate model based on a new
           modified couple stress theory
    • Authors: He Dan; Yang Wanli; Chen Wanji
      Abstract: Publication date: Available online 10 February 2017
      Source:Acta Mechanica Solida Sinica
      Author(s): He Dan, Yang Wanli, Chen Wanji
      In this study, a size-dependent composite laminated skew Mindlin plate model is proposed based on a new modified couple stress theory. This plate model can be viewed as a simplified couple stress theory in engineering mechanics. Governing equations and related boundary conditions are derived based on the principle of minimum potential energy. The Rayleigh–Ritz method is employed to obtain the numerical solutions of the center deflections of simply supported plates with different ply orientations. Numerical results show that the normalized center deflections obtained by the proposed model are always smaller than those obtained by the classical one, i.e. the present model can capture the scale effects of microstructures. Moreover, a phenomenon is revealed that the ply orientation would make a significant influence on the magnitude of scale effects of composite laminated plates at micro scale. Additionally, the present model of thick skew plate can be degenerated to the model of Kirchhoff plate based on the modified couple stress theory by adopting the assumptions in Bernoulli-Euler beam and material isotropy.

      PubDate: 2017-02-13T17:02:22Z
      DOI: 10.1016/j.camss.2016.12.001
       
  • Effect of temperature on pull-in voltage and nonlinear vibration behavior
           of nanoplate-based NEMS under hydrostatic and electrostatic actuations
    • Authors: Farzad Ebrahimi; S.H.S. Hosseini
      Abstract: Publication date: Available online 10 February 2017
      Source:Acta Mechanica Solida Sinica
      Author(s): Farzad Ebrahimi, S.H.S. Hosseini
      This paper deals with the study of the temperature effect on the nonlinear vibration behavior of nanoplate-based nano electromechanical systems (NEMS) subjected to hydrostatic and electrostatic actuations. Using Eringen's nonlocal elasticity and Gurtin–Murdoch theory, the nonlocal plate model is derived through Hamilton's principle. The governing equation which is extremely nonlinear due to the geometrical nonlinearity and electrostatic attraction forces is solved numerically using the differential quadrature method (DQM). The accuracy of the present method is verified by comparing the obtained results with the experimental data and those in the literature and very good agreement is obtained. Finally a comprehensive study is carried out to determine the influence of temperature on the nonlinear vibration characteristics of NEMS have made of two different materials including aluminum (Al) and silicon (Si) and some conclusions are drawn.

      PubDate: 2017-02-13T17:02:22Z
      DOI: 10.1016/j.camss.2017.02.001
       
  • An adaptive cell-based domain integration method for treatment of domain
           integrals in 3D boundary element method for potential and elasticity
           problems
    • Authors: Qiao Wang; Wei Zhou; Yonggang Cheng; Gang Ma; Xiaolin Chang; Qiang Huang
      Abstract: Publication date: Available online 10 February 2017
      Source:Acta Mechanica Solida Sinica
      Author(s): Qiao Wang, Wei Zhou, Yonggang Cheng, Gang Ma, Xiaolin Chang, Qiang Huang
      An adaptive cell-based domain integration method (CDIM) is proposed for the treatment of domain integrals in 3D boundary element method (BEM). The domain integrals are computed in background cells rather than volume elements. The cells are created from the boundary elements based on an adaptive oct-tree structure and no other discretization is needed. Cells containing the boundary elements are subdivided into smaller sub-cells adaptively according to the sizes and levels of the boundary elements; and the sub-cells outside the domain are deleted to obtain the desired accuracy. The method is applied in the 3D potential and elasticity problems in this paper.

      PubDate: 2017-02-13T17:02:22Z
      DOI: 10.1016/j.camss.2016.08.002
       
  • A unified plasticity methodology for rate- and temperature-sensitive
           alloys exhibiting a non-linear kinematic hardening behaviour
    • Authors: Jacques Luk-Cyr; Daniel Paquet; Jacques Lanteigne; Henri Champliaud; Aurelian Vadean
      Abstract: Publication date: Available online 9 February 2017
      Source:Acta Mechanica Solida Sinica
      Author(s): Jacques Luk-Cyr, Daniel Paquet, Jacques Lanteigne, Henri Champliaud, Aurelian Vadean
      In this paper, a novel unified plasticity methodology is proposed to allow the coupling of rate- and temperature-sensitivity of engineering alloys as well as the non-linear kinematic hardening behaviour often observed during cyclic loading. The proposed methodology is general in the sense that an arbitrary constitutive model may be chosen for the viscoplastic part, as well as the cyclic part. We adapt our model with a physically-motivated viscoplasticity flow rule and a nonlinear kinematic hardening model. In contrast with other unified plasticity models, the simplified theory involves few material parameters that can be readily calibrated from standard mechanical tests. The capabilities of the proposed theory are demonstrated for a hot rolled annealed 304L stainless steel supplied by VI-Metal Peckover. The model is tested with stress-strain curves obtained from standard tensile and cyclic uniaxial tests at various strain amplitudes and strain-rates, and good accuracy of the response is obtained for strains up to 15%, within a temperature range of 293 − 673 K. We note that the cyclic plasticity model in our adapted theory can be readily enhanced with ratchetting, mean stress relaxation, strain amplitude history, Masing effects or other complex capabilities.

      PubDate: 2017-02-13T17:02:22Z
      DOI: 10.1016/j.camss.2016.09.001
       
  • Differential derivation of momentum and energy equations IN
           electroelasticity
    • Authors: Jiashi Yang
      Abstract: Publication date: Available online 9 February 2017
      Source:Acta Mechanica Solida Sinica
      Author(s): Jiashi Yang
      This paper presents a derivation of the equations of linear momentum, angular momentum, and energy of an electroelastic body using a composite particle consisting of two differential elements based on Tiersten's two-continuum model. The differential derivation shows the physics involved in a way different from the integral approach in the literature. Like the integral approach, it also produces the expressions of the electric body force, couple, and power which are fundamental to the development of the nonlinear macroscopic theory of an electroelastic body.

      PubDate: 2017-02-13T17:02:22Z
      DOI: 10.1016/j.camss.2016.05.001
       
  • Simulation of plastic deformation induced texture evolution using the
           crystallographic homogenization finite element method
    • Authors: Y.P. Chen; Y.Y. Cai
      Abstract: Publication date: Available online 9 February 2017
      Source:Acta Mechanica Solida Sinica
      Author(s): Y.P. Chen, Y.Y. Cai
      A semi-implicit elastic/crystalline viscoplastic finite element (FE) method based on a “crystallographic homogenization” approach is formulated for a multi-scale analysis. In the formulation, the asymptotic series expansion is introduced to define the displacement in the micro-continuum. This homogenization FE analysis is aimed at predicting the plastic deformation induced texture evolution of polycrystalline materials, the constituent microstructure of which is represented by an assembly of single crystal grains. The rate dependent crystal plasticity model is adopted for the description of microstructures. Their displacements are decomposed into two parts: the homogenized deformation defined in the macro-continuum and the perturbed one in the micro-continuum. This multi-scale formulation makes it possible to carry out an alternative transition from a representative micro-structure to the macro-continuum. This homogenization procedure satisfies both the compatibility and the equilibrium in the micro-structure. This developed code is applied to predict the texture evolution, and its performance is demonstrated by the numerical examples of texture evolution of FCC polycrystalline metals.

      PubDate: 2017-02-13T17:02:22Z
      DOI: 10.1016/j.camss.2016.10.002
       
  • A new, direct approach toward modeling thermo-coupled fatigue failure
           behavior of metals and alloys
    • Authors: Zhaoling Wang; Hao Li; Zhengnan Yin; Heng Xiao
      Abstract: Publication date: Available online 9 February 2017
      Source:Acta Mechanica Solida Sinica
      Author(s): Zhaoling Wang, Hao Li, Zhengnan Yin, Heng Xiao
      The objective of this study is two-fold. Firstly, new finite strain elastoplasticity models are proposed from a fresh standpoint to achieve a comprehensive representation of thermomechanical behavior of metals and alloys over the whole deformation range up to failure. As contrasted with the usual elastoplasticity models, such new models of much simpler structure are totally free, in the sense that both the yield condition and the loading-unloading conditions need not be introduced as extrinsic coercive conditions but are automatically incorporated as inherent constitutive features into the models. Furthermore, the new models are shown to be thermodynamically consistent, in a further sense that both the specific entropy function and the Helmholtz free energy function may be presented in explicit forms, such that the thermodynamic restriction stipulated by Clausius-Duhem inequality for the intrinsic dissipation may be identically satisfied. Secondly, it is then demonstrated that the thermo-coupled fatigue failure behavior under combined cyclic changes of stress and temperature may be derived as direct consequences from the new models. This novel result implies that the new model can directly characterize the thermo-coupled fatigue failure behavior of metals and alloys, without involving any usual damage-like variables as well as any ad hoc additional criteria for failure. In particular, numerical examples show that, under cyclic changes of temperature, the fatigue characteristic curve of fatigue life versus temperature amplitude may be obtained for the first time from model prediction both in the absence and in the presence of stress. Results are in agreement with the salient features of metal fatigue failure.

      PubDate: 2017-02-13T17:02:22Z
      DOI: 10.1016/j.camss.2016.10.001
       
  • A Theoretical Model for Characterizing the Internal Contact of the CICC
           Strands under Axial Strain
    • Authors: Shuai Dong; Ze Jing; Huadong Yong; Youhe Zhou
      Pages: 455 - 467
      Abstract: Publication date: October 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 5
      Author(s): Shuai Dong, Ze Jing, Huadong Yong, Youhe Zhou
      A theoretical model is proposed to calculate the internal contact distributions and contact forces of a 3×4×4×4 twisted Nb3Sn cable under applied axial strain. The critical current density reduction of the whole cable can be calculated. The thin rod theory is employed to analyze the mechanical behavior of each strand. According to the regular helical structure, the contact distribution of each strand is obtained, and the contact force in the cable is analyzed. At last, a prediction about the critical current density of the twisted cable is made. The results show that decreasing the pitch length can reduce the contact forces between strands.

      PubDate: 2016-11-03T18:53:45Z
      DOI: 10.1016/s0894-9166(16)30264-6
       
  • Nonlinear Vibration of A Loosely Supported Curved Pipe Conveying Pulsating
           Fluid under Principal Parametric Resonance
    • Authors: Yangyang Luo; Min Tang; Qiao Ni; Yikun Wang; Lin Wang
      Pages: 468 - 478
      Abstract: Publication date: October 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 5
      Author(s): Yangyang Luo, Min Tang, Qiao Ni, Yikun Wang, Lin Wang
      In this paper, the nonlinear dynamics of a curved pipe is investigated in the case of principal parametric resonance due to pulsating flow and impact with loose supports. The coupled in-plane and out-of-plane governing equations with the consideration of von Karman geometric nonlinearity are presented and discretized via the differential quadrature method (DQM). The nonlinear dynamic responses are calculated numerically to demonstrate the influence of pulsating frequency. Finally, the impact is taken into consideration. The influence of clearance on fretting-wear damage, such as normal work rate, contact ratio and impact force level, is demonstrated.

      PubDate: 2016-11-03T18:53:45Z
      DOI: 10.1016/s0894-9166(16)30265-8
       
  • SH Waves in (1 –x)Pb(Mg1/3Nb2/3)O3- xPbTiO3 Piezoelectric Layered
           Structures Loaded with Viscous Liquid
    • Authors: Guoquan Nie; Jinxi Liu; Yanping Kong; Xueqian Fang
      Pages: 479 - 489
      Abstract: Publication date: October 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 5
      Author(s): Guoquan Nie, Jinxi Liu, Yanping Kong, Xueqian Fang
      The velocity dispersion and attenuation of shear horizontal (SH) waves in a layered piezoelectric structure loaded with viscous liquid is studied, where the (1 – x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 [PMN-xPT] single crystal is chosen as the piezoelectric layer. The PMN-xPT is being polarized along [011]c and [001]c so that the macroscopic symmetries are mm 2 and 4 mm, respectively. For the nonconductive liquid, the electrically open and shorted conditions at the interface between the liquid and the piezoelectric layer are considered. The phase velocity equations are derived analytically. The effects of the electrically boundary condition, the viscous coefficient and mass density of liquid as well as the thickness of the PMN-xPT layer on the phase velocity and attenuation are graphically illustrated. The results show that the phase velocity for the [011]c polarized PMN-0.29PT is much smaller than that for the [001]c polarized PMN-0.33PT, and the effects of viscous coefficient and piezoelectric layer thickness on the phase velocity for the [011]c case are stronger than that for the [001]c case. In addition, the electrical boundary conditions have an obvious influence on the propagation behaviors. These results can be useful for the designs and applications of acoustic wave devices and liquid biosensors.

      PubDate: 2016-11-03T18:53:45Z
      DOI: 10.1016/s0894-9166(16)30266-x
       
  • Dynamic Crushing Strength Analysis of Auxetic Honeycombs
    • Authors: Xiuhui Hou; Zichen Deng; Kai Zhang
      Pages: 490 - 501
      Abstract: Publication date: October 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 5
      Author(s): Xiuhui Hou, Zichen Deng, Kai Zhang
      The in-plane dynamic crushing behavior of re-entrant honeycomb is analyzed and compared with the conventional hexagon topology. Detailed deformation modes along two orthogonal directions are examined, where a parametric study of the effect of impact velocity and cell wall aspect ratio is performed. An analytical formula of the dynamic crushing strength is then deduced based on the periodic collapse mechanism of cell structures. Comparisons with the finite element results validate the effectiveness of the proposed analytical method. Numerical results also reveal higher plateau stress of re-entrant honeycomb over conventional hexagon topology, implying better energy absorption properties. The underlying physical understanding of the results is emphasized, where the auxetic effect (negative Poisson’s ratio) induced in the re-entrant topology is believed to be responsible for this superior impact resistance.

      PubDate: 2016-11-03T18:53:45Z
      DOI: 10.1016/s0894-9166(16)30267-1
       
  • Two Kinds Equal Frequency Circuits to Achieve Locally Resonant Band Gap of
           a Circular Plate Attached Alternately by Piezoelectric Unimorphs
    • Authors: Longxiang Dai; Hongping Hu; Shan Jiang; Xuedong Chen
      Pages: 502 - 513
      Abstract: Publication date: October 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 5
      Author(s): Longxiang Dai, Hongping Hu, Shan Jiang, Xuedong Chen
      A circular thin plate is proposed for vibration attenuation, which is attached alternately by annular piezoelectric unimorphs with resonant shunt circuits. Two kinds of equal frequency resonant shunt circuits are designed to achieve an integrated locally resonant (LR) band gap (BG) with a much smaller transmission factor: (1) the structure is arrayed periodically while the resonant shunt circuits are aperiodic; (2) the resonant shunt circuits are periodic while the structure is aperiodic. The transmission factor curve is calculated, which is validated by the finite element method. Dependences of the LR BG performance upon the geometric and electric parameters are also analyzed.

      PubDate: 2016-11-03T18:53:45Z
      DOI: 10.1016/s0894-9166(16)30268-3
       
  • The Three-Stage Model Based on Strain Strength Distribution for the
           Tensile Failure Process of Rock and Concrete Materials
    • Authors: Rukun Guo; Shihai Li; Dong Zhou
      Pages: 514 - 526
      Abstract: Publication date: October 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 5
      Author(s): Rukun Guo, Shihai Li, Dong Zhou
      A three-stage model is introduced to describe the tensile failure process of rock and concrete materials. Failure of the material is defined to contain three stages in the model, which include elastic deformation stage, body damage stage and localization damage stage. The failure mode change from uniform body damage to localization damage is expressed. The heterogeneity of material is described with strain strength distribution. The fracture factor and intact factor, defined as the distribution function of strain strength, are used to express the fracture state in the failure process. And the distributive parameters can be determined through the experimental stress-strain curve.

      PubDate: 2016-11-03T18:53:45Z
      DOI: 10.1016/s0894-9166(16)30269-5
       
  • A Refined Theory of Axisymmetric Poroelastic Circular Cylinder
    • Authors: Di Wu; Xiangyong Li; Lianying Yu; Baosheng Zhao; Yang Gao
      Pages: 527 - 535
      Abstract: Publication date: October 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 5
      Author(s): Di Wu, Xiangyong Li, Lianying Yu, Baosheng Zhao, Yang Gao
      A refined theory of axisymmetric deformation of an isotropic poroelastic circular cylinder in a steady-state is presented directly by utilizing the general solutions and Lur’e method without any advance hypothesis. The refined equations are derived under non-homogenous boundary conditions, and the approximate solutions are obtained by omitting higher-order terms. The all-inclusive refined equations and approximate solutions constitute the refined theory of circular cylinders. Correlative examples are brought up to analyze influences of liquid-solid coupling properties on the mechanical behavior of poroelastic materials. Moreover, the present results are converted into those of homologous pure elastic problem directly.

      PubDate: 2016-11-03T18:53:45Z
      DOI: 10.1016/s0894-9166(16)30270-1
       
  • Dielectric Breakdown Model for an Electrically Semi-Permeable Penny-Shaped
           Crack in Three-Dimensional Piezoelectric Media
    • Authors: Minghao Zhao; Huayang Dang; Guangtao Xu; Cuiying Fan
      Pages: 536 - 546
      Abstract: Publication date: October 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 5
      Author(s): Minghao Zhao, Huayang Dang, Guangtao Xu, Cuiying Fan
      The dielectric breakdown (DB) model for a penny-shaped crack under a semi-permeable boundary condition in a three-dimensional piezoelectric medium is studied. An approximate analytical solution is derived by using the boundary integral equation with extended displacement discontinuity, and the corresponding boundary element method with double iterative approaches is developed to analyze the semi-permeable crack. The effect of electric boundary conditions on crack faces is discussed on the basis of DB model. By comparing the DB model with the polarization saturation (PS) model for different piezoelectric materials, some interesting phenomena related to the electric yielding zone and local J-integral are observed.

      PubDate: 2016-11-03T18:53:45Z
      DOI: 10.1016/s0894-9166(16)30271-3
       
  • Thermal Buckling Analysis of Size-Dependent FG Nanobeams Based on the
           Third-Order Shear Deformation Beam Theory
    • Authors: Farzad Ebrahimi; Mohammad Reza Barati
      Pages: 547 - 554
      Abstract: Publication date: October 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 5
      Author(s): Farzad Ebrahimi, Mohammad Reza Barati
      In this paper, the thermal effects on the buckling of functionally graded (FG) nanobeams subjected to various types of thermal loading including uniform, linear and non-linear temperature changes are investigated based on the nonlocal third-order shear deformation beam theory. The material properties of FG nanobeam are supposed to vary gradually along the thickness direction according to the power-law form. The governing equations are derived through Hamilton’s principle and solved analytically. Comparison examples are performed to verify the present results. Obtained results are presented for thermal buckling analysis of FG nanobeams such as the effects of the power-law index, nonlocal parameter, slenderness ratio and thermal loading in detail.

      PubDate: 2016-11-03T18:53:45Z
      DOI: 10.1016/s0894-9166(16)30272-5
       
  • Experimental and Numerical Study of Shear Fracture in Brittle Materials
           with Interference of Initial Double Cracks
    • Authors: Hadi Haeri; Vahab Sarfarazi; Mohammad Fatehi Marji; Ahmadreza Hedayat; Zheming Zhu
      Pages: 555 - 566
      Abstract: Publication date: October 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 5
      Author(s): Hadi Haeri, Vahab Sarfarazi, Mohammad Fatehi Marji, Ahmadreza Hedayat, Zheming Zhu
      A simultaneous experimental and numerical study of shear fracture of concrete-like materials is carried out using Brazilian disc specimens with initial double edge cracks and fourpoint bending beam specimens with double edge-notches. The interference effects of two cracks/notches are investigated through varied ligament angles and crack lengths. It is shown that shear fracturing paths change remarkably with the initial ligament angles and crack lengths. The cracked specimens are numerically simulated by an indirect boundary element method. A comparison between the numerical results and the experimental ones shows good agreement.

      PubDate: 2016-11-03T18:53:45Z
      DOI: 10.1016/s0894-9166(16)30273-7
       
  • Effect of Oxidation-Induced Material Parameter Variation on the High
           Temperature Oxidation Behavior of Nickel
    • Authors: Chao Wang; Shigang Ai; Daining Fang
      Pages: 337 - 344
      Abstract: Publication date: August 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 4
      Author(s): Chao Wang, Shigang Ai, Daining Fang
      In high temperature oxidation environment, the oxidation reaction will induce variations in material parameters, such as Young's modulus, thermal expansion coefficient (CTE), coefficient of oxygen diffusion (COD), etc. The oxidation-induced material parameter variations should be considered in high temperature mechanical analysis. In this paper, high temperature oxidation behavior of an oxide film/metal substrate system was investigated through a modified phase field approach. The oxidative stress and oxidation weight gain induced by high temperature oxidation were studied. Effects of Young's modulus, COD and CTE on oxidative stress in the oxide film were studied particularly. The simulation results showed that a better agreement with the experimental results could be obtained when considering the oxidation-induced material parameter variations in the high temperature mechanical analysis of oxide film/metal substrate system. The simulation results demonstrated that oxidative stress and oxidation weight gain were more sensitive to the variation of Young's modulus than to the variations of COD and CTE.

      PubDate: 2016-10-10T17:49:34Z
      DOI: 10.1016/s0894-9166(16)30237-3
       
  • Generalized Covariant Derivative with Respect to Time in Flat Space (I):
           Eulerian Description
    • Authors: Yajun Yin
      Pages: 345 - 358
      Abstract: Publication date: August 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 4
      Author(s): Yajun Yin
      This paper reports a new derivative in the Eulerian description in flat space-the generalized covariant derivative with respect to time. The following contents are included: (a) the restricted covariant derivative with respect to time for Eulerian component is defined; (b) the postulate of the covariant form invariability in time field is set up; (c) the generalized covariant derivative with respect to time for generalized Eulerian component is defined; (d) the algebraic structure of the generalized covariant derivative with respect to time is made clear; (e) the covariant differential transformation group in time filed is derived. These progresses reveal the covariant form invariability of Eulerian space and time.

      PubDate: 2016-10-10T17:49:34Z
      DOI: 10.1016/s0894-9166(16)30238-5
       
  • Generalized Covariant Derivative with Respect to Time in Flat Space (II):
           Lagrangian Description
    • Authors: Yajun Yin
      Pages: 359 - 370
      Abstract: Publication date: August 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 4
      Author(s): Yajun Yin
      The previous paper reported a new derivative in the Eulerian description in flat space—the generalized covariant derivative of generalized Eulerian component with respect to time. This paper extends the thought from the Eulerian description to the Lagrangian description: on the basis of the postulate of covariant form invariability in time field, we define a new derivative in the Lagrangian description in flat space—the generalized covariant derivative of generalized Lagrangian component with respect to time. Besides, the covariant differential transformation group is set up. The covariant form invariability of Lagrangian space-time is ascertained.

      PubDate: 2016-10-10T17:49:34Z
      DOI: 10.1016/s0894-9166(16)30239-7
       
  • The Residual Strain Measurement of Thin Conductive Metal Wire after
           Electrical Failure with SEM Moiré
    • Authors: Yanjie Li; Huimin Xie; Qinghua Wang; Mengmeng Zhou; Manqiong Xu; Qiang Luo; Changzhi Gu
      Pages: 371 - 378
      Abstract: Publication date: August 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 4
      Author(s): Yanjie Li, Huimin Xie, Qinghua Wang, Mengmeng Zhou, Manqiong Xu, Qiang Luo, Changzhi Gu
      In this study, the residual strain of a thin conductive metal wire on a polymer substrate after electrical failure is measured with SEM moire. Focused ion beam (FIB) milling is applied to fabricate micron moire gratings on the surfaces of constantan wires and the random phase shifting technique is used to process moire fringes. The virtual strain method is briefly introduced and used to calculate the real strain of specimens. In order to study the influence of a defect on the electrical failure of the constantan wire, experiments were conducted on two specimens, one with a crack, while the other one without any crack. By comparing the results, we found that the defect makes the critical beam current of electrical failure decrease. In addition, the specimens were subjected to compression after electrical failure, in agreement with the observed crack closure of the specimen. The successful results demonstrate that the moire method is effective to characterize the full-field deformation of constantan wires on the polymer membrane, and has a good potential for further application to the deformation measurement of thin films.

      PubDate: 2016-10-10T17:49:34Z
      DOI: 10.1016/s0894-9166(16)30240-3
       
  • Isogeometric Analysis of the Nonlinear Deformation of Planar Flexible
           Beams with Snap-back
    • Authors: Zheng Huang; Zeng He; Wen Jiang; Hou Qiao; Hui Wang
      Pages: 379 - 390
      Abstract: Publication date: August 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 4
      Author(s): Zheng Huang, Zeng He, Wen Jiang, Hou Qiao, Hui Wang
      Based on the continuity of the derivatives of the Non-Uniform Rational B-Splines (NURBS) curve and the Jaumann strain measure, the present paper adopted the position coordinates of the control points as the degrees of freedom and developed a planar rotation-free Euler-Bernoulli beam element for isogeometric analysis, where the derivatives of the field variables with respect to the arc-length were expressed as the sum of the weighted sum of the position coordinates of the control points, and the NURBS basis functions were used as the weight functions. Furthermore, the concept of bending strip was used to involve the rigid connection between multiple patches. Several typical examples with geometric nonlinearities were used to demonstrate the accuracy and effectiveness of the proposed algorithm. The presented formulation fully accounts for the geometric nonlinearities and can be used to study the snap-through and snap-back phenomena of flexible beams.

      PubDate: 2016-10-10T17:49:34Z
      DOI: 10.1016/s0894-9166(16)30241-5
       
  • Tension-Torsion High-Cycle Fatigue Life Prediction of 2A12-T4 Aluminium
           Alloy by Considering the Anisotropic Damage: Model, Parameter
           Identification, and Numerical Implementation
    • Authors: Linlin Sun; Miao Zhang; Weiping Hu; Qingchun Meng
      Pages: 391 - 406
      Abstract: Publication date: August 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 4
      Author(s): Linlin Sun, Miao Zhang, Weiping Hu, Qingchun Meng
      To consider the anisotropic damage in fatigue, an improved boom-panel model is presented to simulate a representative volume element (RVE) in the framework of continuum damage mechanics. The anisotropic damage state of the RVE is described by the continuity extents of booms and panels, whose damage evolutions are assumed to be isotropic. The numerical implementation is proposed on the basis of damage mechanics and the finite element method. Finally, the approach is applied to the fatigue life prediction of 2A12-T4 aluminium alloy specimen under cyclic loading of tension-torsion. The results indicate a good agreement with the experimental data.

      PubDate: 2016-10-10T17:49:34Z
      DOI: 10.1016/s0894-9166(16)30242-7
       
  • Stress Intensity Factor for the Interaction between a Straight Crack and a
           Curved Crack in Plane Elasticity
    • Authors: M.R. Aridi; N.M.A. Nik Long; Z.K. Eshkuvatov
      Pages: 407 - 415
      Abstract: Publication date: August 2016
      Source:Acta Mechanica Solida Sinica, Volume 29, Issue 4
      Author(s): M.R. Aridi, N.M.A. Nik Long, Z.K. Eshkuvatov
      Formulation in terms of hypersingular integral equations for the interaction between straight and curved cracks in plane elasticity is obtained using the complex variable functions method. The curved length coordinate method and a suitable numerical scheme are used to solve such integrals numerically for the unknown function, which are later used to find the stress intensity factor, SIF.

      PubDate: 2016-10-10T17:49:34Z
      DOI: 10.1016/s0894-9166(16)30243-9
       
 
 
JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
Fax: +00 44 (0)131 4513327
 
Home (Search)
Subjects A-Z
Publishers A-Z
Customise
APIs
Your IP address: 54.166.186.79
 
About JournalTOCs
API
Help
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-2016