Subjects -> INSTRUMENTS (Total: 63 journals)
Showing 1 - 16 of 16 Journals sorted by number of followers
International Journal of Remote Sensing     Hybrid Journal   (Followers: 151)
IEEE Sensors Journal     Hybrid Journal   (Followers: 112)
Remote Sensing of Environment     Hybrid Journal   (Followers: 96)
Journal of Applied Remote Sensing     Hybrid Journal   (Followers: 88)
Remote Sensing     Open Access   (Followers: 57)
Modern Instrumentation     Open Access   (Followers: 57)
International Journal of Remote Sensing Applications     Open Access   (Followers: 49)
International Journal of Instrumentation Science     Open Access   (Followers: 41)
Experimental Astronomy     Hybrid Journal   (Followers: 39)
Measurement and Control     Open Access   (Followers: 36)
Photogrammetric Engineering & Remote Sensing     Full-text available via subscription   (Followers: 33)
Journal of Instrumentation     Hybrid Journal   (Followers: 31)
Remote Sensing Science     Open Access   (Followers: 30)
Applied Mechanics Reviews     Full-text available via subscription   (Followers: 27)
Review of Scientific Instruments     Hybrid Journal   (Followers: 20)
European Journal of Remote Sensing     Open Access   (Followers: 18)
Flow Measurement and Instrumentation     Hybrid Journal   (Followers: 15)
Journal of Sensors and Sensor Systems     Open Access   (Followers: 12)
Transactions of the Institute of Measurement and Control     Hybrid Journal   (Followers: 12)
Remote Sensing Applications : Society and Environment     Full-text available via subscription   (Followers: 9)
Videoscopy     Full-text available via subscription   (Followers: 9)
International Journal of Applied Mechanics     Hybrid Journal   (Followers: 8)
Metrology and Measurement Systems     Open Access   (Followers: 8)
Science of Remote Sensing     Open Access   (Followers: 7)
Imaging & Microscopy     Hybrid Journal   (Followers: 7)
Instrumentation Science & Technology     Hybrid Journal   (Followers: 7)
Microscopy     Hybrid Journal   (Followers: 7)
International Journal of Metrology and Quality Engineering     Full-text available via subscription   (Followers: 6)
Computational Visual Media     Open Access   (Followers: 5)
Measurement : Sensors     Open Access   (Followers: 5)
PFG : Journal of Photogrammetry, Remote Sensing and Geoinformation Science     Hybrid Journal   (Followers: 5)
Optoelectronics, Instrumentation and Data Processing     Hybrid Journal   (Followers: 5)
Journal of Astronomical Instrumentation     Open Access   (Followers: 4)
IEEE Sensors Letters     Hybrid Journal   (Followers: 4)
Sensors and Materials     Open Access   (Followers: 4)
Journal of Optical Technology     Full-text available via subscription   (Followers: 4)
Journal of Medical Devices     Full-text available via subscription   (Followers: 4)
Measurement Techniques     Hybrid Journal   (Followers: 3)
Sensors International     Open Access   (Followers: 3)
IJEIS (Indonesian Journal of Electronics and Instrumentation Systems)     Open Access   (Followers: 3)
IEEE Journal on Miniaturization for Air and Space Systems     Hybrid Journal   (Followers: 3)
Solid State Nuclear Magnetic Resonance     Hybrid Journal   (Followers: 3)
Journal of Instrumentation Technology & Innovations     Full-text available via subscription   (Followers: 2)
International Journal of Sensor Networks     Hybrid Journal   (Followers: 2)
Geoscientific Instrumentation, Methods and Data Systems     Open Access   (Followers: 2)
International Journal of Testing     Hybrid Journal   (Followers: 1)
Medical Devices & Sensors     Hybrid Journal   (Followers: 1)
Invention Disclosure     Open Access   (Followers: 1)
Journal of Research of NIST     Open Access   (Followers: 1)
Geoscientific Instrumentation, Methods and Data Systems Discussions     Open Access   (Followers: 1)
International Journal of Measurement Technologies and Instrumentation Engineering     Full-text available via subscription   (Followers: 1)
Journal of Medical Signals and Sensors     Open Access   (Followers: 1)
Instruments and Experimental Techniques     Hybrid Journal   (Followers: 1)
Journal of Vacuum Science & Technology B     Hybrid Journal   (Followers: 1)
Metrology and Instruments / Метрологія та прилади     Open Access  
Measurement Instruments for the Social Sciences     Open Access  
Труды СПИИРАН     Open Access  
Standards     Open Access  
Jurnal Informatika Upgris     Open Access  
InfoTekJar : Jurnal Nasional Informatika dan Teknologi Jaringan     Open Access  
Devices and Methods of Measurements     Open Access  
EPJ Techniques and Instrumentation     Open Access  
Documenta & Instrumenta - Documenta et Instrumenta     Open Access  
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Journal Cover
International Journal of Applied Mechanics
Journal Prestige (SJR): 0.793
Citation Impact (citeScore): 2
Number of Followers: 8  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1758-8251 - ISSN (Online) 1758-826X
Published by World Scientific Homepage  [120 journals]
  • Progressive Failure Analysis of Composite Laminates Subjected to
           Transverse Loading with Augmented Finite Element Method

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      Authors: Shu Li, Zhaoyang Ma, Qingda Yang
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      In this paper, two-dimensional (2D) orthotropic augmented finite element method (A-FEM) is applied to account for progressive failure of composite laminates under transverse loading, which considers all major cracking modes (delamination, fiber kinking/rupture matrix cracking). High-fidelity simulations of different stacking composite laminates under transverse loading are implemented. Both predicted load−deflection curves and damage evolution are in good agreement with that of experimental results, which demonstrates the numerical capability of A-FEM. In addition, the influence of stacking sequence on the failure mechanism is also studied by predicted damage evolution of laminates with different stacking sequence [math], [math] and [math]. Results show that the tensile matrix crack in the bottom laminar is always the first damage mode for the composite laminate, and the subsequent crack propagation is related to ply orientation of adjacent plies which have a blocking effect on crack propagation.
      Citation: International Journal of Applied Mechanics
      PubDate: 2022-06-29T07:00:00Z
      DOI: 10.1142/S1758825122500387
       
  • A Novel Re-Entrant-Type Metamaterial with Tunable Negative Poisson’s
           Ratios and Coefficients of Thermal Expansion

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      Authors: Fucong Lu, Xinqiang Chen, Yilin Zhu, Chuanbiao Zhang, Yuhang Hou
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      Introducing bi-material double-triangular elements into a standard re-entrant structure, a novel metamaterial is proposed in this work. The effect of geometrical parameters on negative Poisson’s ratio (NPR) and coefficient of thermal expansion (CTE) is studied theoretically and verified by finite element (FE) method. Results show that the proposed structure provides tunable Poisson’s ratios in wide ranges (from negative to positive) by adopting base materials with different elastic moduli. The horizontal Poisson’s ratio of the structure increases with the increment of the re-entrant angle, and decreases with the decrement of the elastic modulus ratio (i.e., the ratio of the elastic modulus of MAT-1 and MAT-2); while the vertical Poisson’s ratio decreases with the increment of the re-entrant angle, but is independent on the elastic modulus ratio. Moreover, comparing with various reported re-entrant structures, the proposed design enhances elastic modulus significantly owing to the introduced bi-material triangles. The structure also exhibits tailorable CTEs. The CTE of the structure decreases with the increment of the CTE ratios and the re-entrant angle.
      Citation: International Journal of Applied Mechanics
      PubDate: 2022-06-29T07:00:00Z
      DOI: 10.1142/S1758825122500405
       
  • Simplified Method for Predicting Time-Dependent Behavior of Deep-Buried
           Tunnel Considering Tunnel Excavation Rate and Stress Release Effects

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      Authors: Jutao Qiu, Yusheng Shen, Xi Zhang, Yifei Zhang, Yuhang Gan, Xiaojun Zhou
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      The excavation of a tunnel in soft rock will cause stress disturbance to the surrounding rock. Meanwhile, the creep of soft rock occurs under deviatoric stress, which may cause damage to the tunnel structure and affect its long-term service life. It is a challenge to evaluate the time-dependent behavior of deep-buried tunnels in rheological rock mass accurately and take measures to reduce tunnel convergence as much as possible for geotechnical engineers. A simplified method for calculating the stresses and displacements of the surrounding rock and tunnel lining with time is proposed in this paper. Moreover, theoretical derivations for four viscoelastic models are carried out based on the degeneration relationship between them. The effects of both tunnel excavation rate and rock stress release are considered. The analytical expressions of the lined tunnel are derived via the Boltzmann superposition principle and the theory of the integral equations. The effectiveness of the proposed analytical method is verified by the existing analytical solutions and the numerical simulation. Additionally, the calculated results are compared with those without considering stress release. Finally, parametric analysis is performed to investigate the influence on the responses of the deep-buried tunnel.
      Citation: International Journal of Applied Mechanics
      PubDate: 2022-06-29T07:00:00Z
      DOI: 10.1142/S1758825122500430
       
  • Vibration Control of a Time-Delayed Rotor-Active Magnetic Bearing System
           by Time-Varying Stiffness

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      Authors: Guorong Zhang, Guang Xi
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      Active magnetic bearing (AMB) can actively control the vibration of the rotor, and its control law plays a key role. In this study, the vibration control of a rotor-AMB system with time delay is studied. The nonlinear vibration equation is derived based on the Newton law considering the time-varying stiffness (TVS) control. The method of multiple scales is applied to obtain the approximate solutions in the case of the primary parametric resonance and 1:1 internal resonance. The results show that the vibration amplitude and stable region are both periodic with respect to time delay. Their period is exactly equal to the rotating period of rotor. Additionally, the eccentricity-response curves are constructed to illustrate the vibration control of the time-varying stiffness. The results show that the time-varying stiffness control suppresses the vibration effectively. At the same time, it is also found that the time-varying stiffness control may cause an increase in vibration amplitude or even instability in small range of unbalance eccentricity. The influence of time delay on the time-varying stiffness control is investigated. It is found that the time-varying stiffness controller exhibits different performance depending on the time delay.
      Citation: International Journal of Applied Mechanics
      PubDate: 2022-06-25T07:00:00Z
      DOI: 10.1142/S1758825122500077
       
  • Response Statistics of Single-Degree-of-Freedom Systems with Lévy Noise
           by Improved Path Integral Method

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      Authors: Wanrong Zan, Wantao Jia, Yong Xu
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      In this paper, we put forward an improved version of the path integral (PI) method for the response statistics of single-degree-of-freedom (SDOF) system excited by Lévy noise. To overcome the problem of large amount of calculation and storage, the PI method is simplified and parallelized, which makes the PI method for SDOF system with Lévy noise feasible and efficient. As the key to the PI method, the short-time transition probability density function (PDF) of the SDOF system is derived and verified by proving that the PI solution satisfies the corresponding fractional Fokker–Planck–Kolmogorov (FPK) equation. The fractional FPK equation, which is the governing equation of the SDOF system, is derived through the characteristic function and the Chapman–Kolmogorov equation. To solve the problem of large storage and calculations in the PI method, we simplify the one-step iteration formula and perform parallel calculations on the simplified formula. The simplification of the one-step iteration formula reduces one-fold integration, thereby reducing the storage capacity of the one-step transition matrix. Parallel calculation by domain decomposition can effectively reduce the calculation time, which can be seen from the running time of two prototypical examples. Besides, to show the effectiveness of the improved PI method, Monte Carlo solutions and analytical solutions are used as reference solutions.
      Citation: International Journal of Applied Mechanics
      PubDate: 2022-06-23T07:00:00Z
      DOI: 10.1142/S1758825122500296
       
  • A New Expression of Internal Stiffness for Load Path Analysis in
           Structures

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      Authors: Shengjie Zhao, Nan Wu, Sviatoslaw Karnaoukh
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      The load transfer inside a given structure can be expressed by load paths. Based on the concept of internal stiffness that is independent of stress analysis, the [math]* index is a powerful tool to visualize the load paths by measuring strain energy caused by displacement at the loading point. In this short communication, a scalar index [math]* is introduced as a new expression of internal stiffness to visualize the load paths with a greater precision. The load paths are defined as the streamlines following the decay direction of the internal stiffness. Based on the numerical simulations, [math]* load paths have higher load transfer efficiency compared to [math]* counterparts. The experimental study of an [math]-bracket with stiffeners placed on the main load paths further verifies the effectiveness of the [math]* index for load path analysis. The proposed concept for load path analysis showcases great potential in design evaluation and optimization for load-bearing components from a macroscopic view.
      Citation: International Journal of Applied Mechanics
      PubDate: 2022-06-23T07:00:00Z
      DOI: 10.1142/S1758825122500302
       
  • Indentation Response of Power and Sigmoid Functionally Graded PSZ/NiCrAlY
           Composites

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      Authors: M. A. Eltaher, A. Wagih
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      Owing to their superior mechanical properties, functionally graded materials (FGMs) are currently applicable for many tribological systems, which increased the need for a rapid prediction tool of the hardness and wear behavior of these materials. To this end, this paper aims to present empirical equations to predict the residual indentation deformation for the PSZ/NiCrAlY composite FGM that could give a rapid indication on the material hardness and wear rates at different indentation loads. The empirical equations were derived for two common gradient laws, power (P-FGM) and sigmoid (S-FGM), based on numerical results obtained and validated with experimental results in this study. The numerical results were obtained by simulating indentation experiments using commercial finite element software considering the gradient of all the elastic and plastic material properties. The influence of the gradient index, gradient law and indentation displacement on the force-indentation response, contact pressure distribution, plastic stains, contact surface profile evolutions, and the residual indentation deformations were studied. The results showed that contact force and contact pressure were larger for P-FGM than S-FGM for all the gradient indices. The residual indentation deformation is larger for S-FGM than P-FGM for all the gradient indices due to the higher PSZ ceramic phase at the contact area for P-FGM than S-FGM. The residual indentation deformation of the FGM was normalized with respect to its value for the pure matrix based on the finite element results that highlighted the independence of this ratio on the indentation load. Finally, empirical equations were derived to predict the residual indentation deformation for the PSZ/NiCrAlY composite FGM with respect to the gradient index for both the gradient laws, power and sigmoid functions.
      Citation: International Journal of Applied Mechanics
      PubDate: 2022-06-20T07:00:00Z
      DOI: 10.1142/S1758825122500260
       
  • Size-Dependent Elastic Buckling of Two-Variable Refined Microplates
           Embedded in Elastic Medium

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      Authors: Yuhang Duan, Bo Zhang, Xiangyu Li, Xu Zhang, Huoming Shen
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      This study applies a two-variable refined shear deformation theory (TVRSDT) and a modified couple stress theory (MCST) to develop a size-dependent elastic buckling model for microplates under combined axial compression and in-plane shear and resting on Winkler–Pasternak foundation. Our model incorporates two transverse displacement variables and one material length scale parameter (MLSP); it satisfies the zero-traction boundary conditions on the top and bottom surfaces of microplates, thereby circumventing the use of a shear correction factor. The equations of motion are determined via the Euler–Lagrange equation. A closed-form buckling solution is presented for microplates with four edges simply supported. To handle the nonsimply supported microplates, a thirty-two-degree-of-freedom (32-DOF) four-node differential quadrature (DQ) finite element with [math]-continuity is proposed. The corresponding element matrices are obtained using the minimum potential energy principle. Comparison studies are conducted to exhibit the validity of the derived formulations. Finally, the present buckling model is employed for predicting the elastic buckling behaviors of microplates embedded in an elastic medium. The effects of in-plane loading patterns, boundary conditions, aspect ratio, length-to-thickness ratio, MLSP and elastic medium parameters on the buckling load and buckling mode are elucidated.
      Citation: International Journal of Applied Mechanics
      PubDate: 2022-06-20T07:00:00Z
      DOI: 10.1142/S1758825122500399
       
  • Generalized Theory for DISes in a Large Deformed Solid

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      Authors: Yong Li, Kai Zhang, Fuqian Yang
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      Analysis of diffusion-induced stress in the electrode materials of metal-ion batteries, especially in silicon-anode lithium-ion battery with large deformation, involves an in-depth understanding of the interaction between atomic migration and matrix volume expansion. Under large migration velocity of solute atoms in a host matrix, such chemo-mechanical coupling can result in the damage or structural degradation of the matrix (electrode), leading to capacity fading. Incorporating the effects of concentration changing rate on strain energy in Helmholtz free energy and the finite deformation framework, a generalized theory has been established to solve stresses in an elasto-plastic electrode induced by lithiation. Numerical calculations of lithiation-induced stresses are performed in an amorphous nano-spherical silicon electrode by using the free-volume-based constitutive relation of amorphous materials and the generalized theory. We analyze the effects of the volumetric expansion coefficient associate with solute atoms and the volumetric expansion coefficient associate with the concentration changing rate of solute atoms on the stress evolution. The results reveal that the concentration changing rate of solute atoms likely accelerates surface cracking of electrode materials during lithiation.
      Citation: International Journal of Applied Mechanics
      PubDate: 2022-06-03T07:00:00Z
      DOI: 10.1142/S1758825122500247
       
  • Analytical and Numerical Investigation on Dynamic Behavior of Rectangular
           FML Sandwich Tubes with Metal Foam Core Under Low-Velocity Impact

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      Authors: Yan Song, Hui Yuan, Jinlong Du, Hao Sun, Zelin Han, Jianxun Zhang
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      In this work, the dynamic behavior for clamp-supported rectangular fiber metal laminate (FML) sandwich tubes with metal foam core under low-velocity impact is studied by analytical solution and numerical method analysis. The yield criterion of the FML sandwich tube with metal foam core is proposed. Based on yield criterion, the theoretical solution for rectangular FML sandwich tubes dynamic behavior under low-velocity impact is developed considering the strength and the coupling effect of bending and tension. Finite element study is conducted. Theoretical results are well consistent in the finite element ones. Finally, the influences of material and geometric parameters, and impact position on impact force and maximum deflection of FML sandwich tubes are analyzed systematically. The results reveal that the FML sandwich tubes’ impact forces increase with the increase of the strength, number and thickness of the metal layer, the strength and thickness of the composite layer and foam strength; and impact forces increase with the decrease of the metal volume fraction of FML. Also, the impact force increases with the decrease of the distance between the impact position and the clamp-supported end.
      Citation: International Journal of Applied Mechanics
      PubDate: 2022-06-03T07:00:00Z
      DOI: 10.1142/S1758825122500284
       
  • Design and Optimization of a Multimode Low-Frequency Piezoelectric Energy
           Harvester

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      Authors: Longfei He, Fumio Narita
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      In this paper, we present a microelectromechanical systems (MEMS)-based multimode low-frequency piezoelectric energy harvester (PEH), which can operate at low resonant frequencies (i.e., [math][math]Hz). The proposed harvester has a symmetric serpentine structure with a doubly clamped configuration comprising several proof masses at the junctions. The optimal parameters of the proposed energy harvester are determined by a computerized optimization technique based on a genetic algorithm (GA). Finite element simulations showed that the optimization results can generate high voltage with two usable low-frequency resonant frequencies. Furthermore, we discuss the array structure based on the proposed PEH. Finite element simulations demonstrate that our piezoelectric MEMS harvester array can generate voltage with a frequency ranging from 110.95 to 157.84[math]Hz. Its normalized power density (NDP) when operating in the first four modes is 1284, 932, 1978, and 2592 [math]Wcm[math] m[math]s4, respectively, and its performance outperforms those of previously reported MEMS-based energy harvesters.
      Citation: International Journal of Applied Mechanics
      PubDate: 2022-06-03T07:00:00Z
      DOI: 10.1142/S1758825122500338
       
  • Optimal Response Prediction of Composite Honeycomb Sandwich Plate:
           Theoretical and Experimental Verification

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      Authors: Vasudevan Rajamohan, P. Edwin Sudhagar, A. Paul Praveen, Umut Topal, Subrata Kumar Panda, Trung Vo-Duy
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      This study reports the optimal frequencies and damping factor of the honeycomb sandwich composite plates. The sandwich panel face sheets have been considered as layered composite and honeycomb core. The higher-order shear deformation theory has been adopted to formulate the structural model and solve the governing equations of motion of sandwich structures to compute the frequencies. An optimal layout of the honeycomb composite laminated sandwich structure is being utilized to improvise both the fundamental natural frequencies and damping factors using a teaching–learning-centered artificial bee colony (TLABC). An experimental investigation is performed to demonstrate the effectiveness of the current TLABC algorithm to identify the optimal values by comparing them with numerically obtained results. Additionally, for the optimal layer sequences and the fiber orientations of the composite laminated plates, several optimization problems are developed with the objective functions of frequency maximization and modal damping factors (MDF). The TLABC algorithm integrated with finite element method has been utilized to evaluate the said responses. Hence, it is concluded that the efficient design layout of a honeycomb sandwich composite plate configurations would provide the guidelines for the designer to control the vibration effectively.
      Citation: International Journal of Applied Mechanics
      PubDate: 2022-06-03T07:00:00Z
      DOI: 10.1142/S1758825122500363
       
  • A Triaxial Viscoplastic Model with Temperature Dependence for Asphalt
           Concrete Permanent Deformation

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      Authors: Wei Cao, Y. Richard Kim
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      Asphalt concrete is a composite material comprised of aggregate skeleton and asphalt cement. Its permanent or viscoplastic (VP) deformation is characterized by time and temperature dependence, memory effect, and pressure sensitivity. To the best knowledge of the authors, there have been no VP models explicitly considering the nonlinear temperature effects in permanent deformation of asphalt concrete. In previous work, the authors developed a triaxial VP model that featured a VP relaxation spectrum and a modulus parameter [math],[math]. The spectrum was postulated as a material function representing the time dependence and memory effect, while [math],[math] was only a function of the stress condition to capture the pressure dependence. The objective of this study was to incorporate temperature dependence into the model. It was achieved by introducing the concept of VP shift factor solely to translate the relaxation spectrum. This strategy was inspired by the time–temperature superposition principle in the viscoelastic (VE) theory. The shift factor was identified experimentally at three temperatures different from the model calibration temperature. The VP shift factor function was thus established, and comparison with its VE counterpart showed that the VP response exhibited greater temperature sensitivity. Numerical simulation was conducted at several temperatures to illustrate the nonlinear temperature effects on the VP deformation and relaxation of the internal stress that served as the hardening/softening variable.
      Citation: International Journal of Applied Mechanics
      PubDate: 2022-05-30T07:00:00Z
      DOI: 10.1142/S1758825122500235
       
  • Determination of Assumed Strain Hardening Relationship from
           Shear–Compression Model and Data Analysis

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      Authors: Amir Partovi, Mohammad Mehdi Shahzamanian, Peidong Wu
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      A new method for obtaining equivalent stress–strain curves of bilinear and Swift law material models from the numerical results of shear–compression test (SCT) is developed. This task is conducted on the basis of the approximate analytical relations for the compression and shear conditions at the gauge section and by the application of correction factors. Logarithmic correction models are developed and used to generalize the geometry of an optimum shear–compression specimen (SCS) that is calibrated by one-factor-at-time method for a reference material. Furthermore, a dataset created from 125 finite element simulations is analyzed by data analysis techniques, and a universal nonlinear strain hardening relationship is determined. This model is used to predict the stress–strain curves directly from the force–displacement curve of the SCS. The input and output stress–strain curves are in good agreement with an average error of approximately 3%. The numerical findings of this study provide a foundation to develop a general quantitative relationship to study the behavior of materials by SCT.
      Citation: International Journal of Applied Mechanics
      PubDate: 2022-05-24T07:00:00Z
      DOI: 10.1142/S1758825122500181
       
  • Honeycomb Enhanced Self-Locked Structure for Energy Absorption

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      Authors: Xiaobo Liu, Shaowei Zhu, Liming Chen, Weiguo Li, Houchang Liu, Xin Pan
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      The self-locked structures are expandable, detachable, and easy to transport. When under impact loading, their self-locked effects can prevent the lateral splashing of themselves without any outer constraints, thus such structures have great potential for energy absorbing and protection in some emergencies. However, the low specific energy absorption (EA) of the existing self-locked structures has limited their application. In this work, self-locked structures with honeycombs fillings are proposed to improve their EA capacity. The deformed configurations and EA performance of self-locked structures with and without honeycombs fillings were investigated by experimental and numerical methods. It is found that self-locked structures with honeycombs fillings not only inherit the self-locked effect of existing self-locked structures, but also their load-carrying capacity is greatly improved, and the special EA capacity of the proposed structures is higher than any of the existing self-locked structures. This work provides a guideline for the design of the self-locked structure with both lightweight and high mechanical performance, and it is instructive for the design of other structures with both functional and mechanical properties.
      Citation: International Journal of Applied Mechanics
      PubDate: 2022-05-24T07:00:00Z
      DOI: 10.1142/S1758825122500193
       
  • Wide Bandwidth Wind-Induced Vibration Energy Harvester with an Angle
           Section Head

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      Authors: Yu Chen, Zhichun Yang, Shengxi Zhou
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      A high-performance wind-induced vibration energy harvester with an angle section head is designed. Experimental results show that the harvester has a wide frequency-locked/operating wind speed range. Experiments are carried out for the harvester with different angles and lengths of the angle section head. It is found that the reasonable design of the angle section head can benefit wind energy harvesting. In this study, the widest operating wind speed range of 13.4[math]m/s (from 6.6[math]m/s to 20[math]m/s) is experimentally demonstrated, and the maximum output power is 214.6[math][math]W.
      Citation: International Journal of Applied Mechanics
      PubDate: 2022-05-24T07:00:00Z
      DOI: 10.1142/S1758825122500211
       
  • Coarse-Grained Modeling and Mechanical Behaviors of
           Actin–Spectrin–Microtubule Complex in Axonal Cytoskeleton

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      Authors: Yanzhong Wang, Xi Wei, Bo Gong, Yuan Lin, Jin Qian
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      Axon is a long protrusion from the neuronal cell body whose interconnection forms the nervous network and allows biomechanical signals to be transmitted among neurons. From the mechanic’s point of view, the axon cytoskeleton consists of bundles of microtubules (MTs), cross-linked by microtubule-associated protein (MAP) tau, and supported by a periodic array of actin–spectrin rings. Yet, the fundamental question of how these actin–spectrin rings and microtubule bundles behave in synergy to provide the required mechanical strength to the whole axon is still poorly understood. Here, we developed a coarse-grained molecular dynamics model of axon to address this outstanding issue. We show that the dynamic response of spectrin filaments plays a vital role in the strain-softening of axon, which serves as a buffering mechanism for neurons to accommodate externally imposed deformation. Furthermore, the actin–spectrin structure is found to be essential for maintaining the mechanical stability of axon and allowing it to bear larger compressive forces. Our model and predictions not only explain recent experimental observations on axonal mechanics, but also provide insights on how to potentially modify the mechanical response of axonal cytoskeleton and therefore tune its capability in executing different biological duties.
      Citation: International Journal of Applied Mechanics
      PubDate: 2022-05-24T07:00:00Z
      DOI: 10.1142/S1758825122500223
       
  • Thermal Entrainment in the Core Regions of Transitional Plane Fountains in
           Linearly Stratified Ambient Fluids

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      Authors: M. I. Inam, Wenxian Lin, S. W. Armfield
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      Thermal entrainment is an integral feature of free-shear flows involving temperature changes, including fountains (negatively buoyant jets). The understanding of thermal entrainment is essential for applications involving thermal stratification such as that in a solar water storage tank. In this study, thermal entrainment in the core regions of transitional plane fountains in linearly-stratified ambient fluids is studied numerically over a range of the Froude number, Reynolds number, and dimensionless thermal stratification parameter. The results show that thermal entrainment has a negligible effect on the inner core region, but is significant in the outer core region, particularly at the interfaces among the upflow, downflow, and ambient fluid, and the thermal entrainment parameter, which quantifies the extent of thermal entrainment, decreases with height or in a stronger stratification, but increases with increasing Froude number or Reynolds number. Several numerical relations are obtained with the numerical results for the thermal entrainment parameter.
      Citation: International Journal of Applied Mechanics
      PubDate: 2022-05-14T07:00:00Z
      DOI: 10.1142/S175882512250020X
       
  • Vibro–Acoustic Analysis of the Strong Coupling System with an
           Elastically Restrained Rectangular Plate Backed by a Trapezoidal Cavity

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      Authors: J. L. liao, H. C. Zhu, J. X. Hou, S. W. Yuan
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      The vibro–acoustic strong coupling problem between the panel and cavity widely exists in the industry. This paper developed a numerical method to study the natural characteristics and vibro–acoustic response of the strong coupling system with an elastically restrained rectangular plate backed by a trapezoidal cavity. The isoparametric transformation technique was used to normalize the trapezoidal cavity. The dynamical equations of the coupling system were derived using the energy principle and the Rayleigh–Ritz method with the Legendre polynomial series as trial functions. Then, the effects of structural boundary conditions and bevel angle on the natural frequencies of the system with the elastic plate on the top surface of the trapezoidal cavity were explored. The natural frequency increased with the number of structural support boundaries and the inclination angle of the trapezoidal cavity bevel. Besides, the steady-state response of the coupling system under different excitation conditions was investigated. Therefore, accurate prediction for steady-state response will provide ideas for noise control of the vibro–acoustic strong coupling problem.
      Citation: International Journal of Applied Mechanics
      PubDate: 2022-05-12T07:00:00Z
      DOI: 10.1142/S1758825122500168
       
  • Poro-Thermoelastic Waves in a Homogeneous Anisotropic Plate Plunged in the
           Inviscid Fluid

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      Authors: Vijayata Pathania, Pankaj Dhiman
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      This paper inspects the behavior of thermoelastic waves in the homogeneous, transversely isotropic plate containing voids immersed in the inviscid fluid in reference to the one-temperature generalized model of thermoelasticity. The basic governing equations for the solid plate have been developed in the context of the linear theory of poro-thermoelasticity. Helmholtz decomposition principle has been employed to solve the equations of motion for liquid. For the stress-free solid-liquid interfaces, the isothermal and thermally insulated boundary conditions have been applied simultaneously on the obtained solutions. The solutions of governing equations reveal that there exists a coupled system of waves namely thermal waves, void wave motion, and elastic waves, and a decoupled purely transverse wave. Apart from that, one mechanical wave in each liquid layer also exists. The secular equation for anti-symmetric and symmetric modes of vibration has been derived which better explains wave motion. To unveil the wave characteristics, the numerical–functional iteration technique has been employed for generating numerical data and results have been validated by tracing out the various graphs. The effects of temperature change, as well as voids in the solid plate and inviscid liquid in the neighborhood of the plate, have been noticed on phase velocity, attenuation coefficient, etc
      Citation: International Journal of Applied Mechanics
      PubDate: 2022-04-30T07:00:00Z
      DOI: 10.1142/S1758825122500090
       
  • The Problem of Wedge Indenter with Flat-Rounded Bottom Indenting
           Half-Plane Elastic Body

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      Authors: Bo Liu, Ting Li, Yanhui Han, Yanqing He, Chunqing Fu
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      In this paper, the problem of a wedge indenter with flat-rounded bottom indenting an infinite half-plane elastic body is solved. It can be used to study the penetration force or the surface stress distribution of the cutter when the tool intrudes into an elastic body. First, a first-order continuity method is proposed to eliminate the stress singularity caused by the sharp corners of the wedge indenter with flat bottom. The two-dimensional elastic contact problem is transformed into a Riemann–Hilbert boundary value problem with discontinuous coefficients expressed in the form of complex variables. For the frictionless contact problem, the explicit analytical solution is obtained for contact stress on the half-plane surface. Furthermore, the expression of the stress potential function is also derived to solve the stress field in the half-plane. Verification indicates that the wedge indenter with flat-rounded bottom can degenerate to several well-studied shaped indenters, including the Hertz model and flat-rounded model. The model in this paper is also validated with its numerical counterpart built in the finite element program LS-DYNA. Finally, the sensitivity of different configuration parameters on the normal contact stress and interior stress field in numerical model was investigated.
      Citation: International Journal of Applied Mechanics
      PubDate: 2022-04-25T07:00:00Z
      DOI: 10.1142/S1758825122500107
       
  • A Novel Methodology for Non-Destructive Characterization of
           Polymers’ Viscoelastic Properties

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      Authors: Andrea Genovese, Antonio Maiorano, Riccardo Russo
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      A procedure of non-destructive experimental tests aimed at determining the viscoelastic characteristics of the rubbers is described. After recalling the basic principles of viscoelastic theory, the experimental setup and the measurements necessary for the test are described. The procedure consists in hitting the surface of the object under test with a specially instrumented indenter. The techniques for processing the acquired signals to identify the characteristic starting and ending points of indentation in the time-histories are then illustrated. By analyzing separately the phases of the free drop of the indenter and the phase of contact between indenter and rubber, the main mechanical characteristics, such as stiffness and damping of both the instrumented indenter and the bulk of rubber under test are estimated. The methods of calculating the viscoelastic parameters of the rubber starting from the knowledge of the above mechanical parameters are then illustrated. The determined results, in terms of storage and loss moduli, are compared with those provided by classic DMA type tests. The qualitative agreement is excellent. The quantitative agreement falls in the scattering range typical for this kind of measurement. The paper is completed with a discussion of the main causes of measurement uncertainty.
      Citation: International Journal of Applied Mechanics
      PubDate: 2022-04-25T07:00:00Z
      DOI: 10.1142/S175882512250017X
       
 
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