Subjects -> ENGINEERING (Total: 2878 journals)
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    - ENGINEERING (1458 journals)
    - ENGINEERING MECHANICS AND MATERIALS (458 journals)
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    - INDUSTRIAL ENGINEERING (100 journals)
    - MECHANICAL ENGINEERING (119 journals)

MECHANICAL ENGINEERING (119 journals)                     

Showing 1 - 119 of 119 Journals sorted alphabetically
Accurate: Journal of Mechanical Engineering and Science     Open Access   (Followers: 10)
Acta Mechanica     Hybrid Journal   (Followers: 26)
Acta Mechanica et Automatica     Open Access   (Followers: 1)
Acta Mechanica Solida Sinica     Full-text available via subscription   (Followers: 9)
Acta Universitatis Sapientiae Electrical and Mechanical Engineering     Open Access  
Advanced Energy Materials     Hybrid Journal   (Followers: 30)
Advances in Mechanical Engineering     Open Access   (Followers: 140)
Advances in Tribology     Open Access   (Followers: 15)
American Journal of Mechanical Engineering     Open Access   (Followers: 61)
Archive of Mechanical Engineering     Open Access   (Followers: 73)
Archives of Civil and Mechanical Engineering     Full-text available via subscription   (Followers: 4)
Australian Journal of Mechanical Engineering     Hybrid Journal   (Followers: 6)
Bulletin of NTU - Dynamics and strength of machines     Open Access   (Followers: 2)
Bulletin of the Polish Academy of Sciences : Technical Sciences     Open Access   (Followers: 1)
Case Studies in Mechanical Systems and Signal Processing     Open Access  
Chinese Journal of Mechanical Engineering     Open Access   (Followers: 3)
Curved and Layered Structures     Open Access   (Followers: 3)
Emission Control Science and Technology     Hybrid Journal   (Followers: 2)
European Mechanical Science     Open Access  
Facta Universitatis, Series : Mechanical Engineering     Open Access   (Followers: 6)
Friction     Open Access   (Followers: 7)
Frontiers in Mechanical Engineering     Open Access   (Followers: 6)
Frontiers of Mechanical Engineering     Hybrid Journal   (Followers: 7)
High Speed Machining     Open Access   (Followers: 6)
Human Factors and Mechanical Engineering for Defense and Safety     Hybrid Journal   (Followers: 1)
Infotekmesin : Media Komunikasi Ilmiah Politeknik Cilacap     Open Access  
Ingeniería Mecánica     Open Access   (Followers: 4)
Ingenieria Mecánica. Tecnologia y Desarrollo     Open Access   (Followers: 3)
International Journal of Applied Mechanics and Engineering     Open Access   (Followers: 9)
International Journal of Civil, Mechanical and Energy Science     Open Access   (Followers: 3)
International Journal of Dynamics and Control     Hybrid Journal   (Followers: 7)
International Journal of Engineering Materials and Manufacture     Open Access   (Followers: 2)
International Journal of Manufacturing, Materials, and Mechanical Engineering     Full-text available via subscription   (Followers: 20)
International Journal of Material and Mechanical Engineering     Open Access   (Followers: 29)
International Journal of Mechanical and Materials Engineering     Open Access   (Followers: 11)
International Journal of Mechanical Engineering Education     Full-text available via subscription   (Followers: 13)
International Journal of Mechanical Sciences     Hybrid Journal   (Followers: 14)
International Journal of Mechatronics and Automation     Hybrid Journal   (Followers: 6)
International Journal of Metrology and Quality Engineering     Full-text available via subscription   (Followers: 4)
International Journal of Microwave Engineering and Technology     Full-text available via subscription   (Followers: 5)
International Journal of Powertrains     Hybrid Journal   (Followers: 2)
Iranian Journal of Science and Technology, Transactions of Mechanical Engineering     Hybrid Journal  
JMST Advances     Hybrid Journal  
Journal of Aircraft     Hybrid Journal   (Followers: 336)
Journal of Applied Mechanical Engineering     Open Access   (Followers: 10)
Journal of Applied Mechanical Engineering and Green Technology     Open Access   (Followers: 2)
Journal of Biomechanical Engineering     Full-text available via subscription   (Followers: 14)
Journal of Computational and Applied Research in Mechanical Engineering     Open Access  
Journal of Energy, Mechanical, Material and Manufacturing Engineering     Open Access   (Followers: 1)
Journal of Mechanical Design     Full-text available via subscription   (Followers: 81)
Journal of Mechanical Design and Testing     Open Access   (Followers: 1)
Journal of Mechanical Engineering     Open Access   (Followers: 72)
Journal of Mechanical Engineering and Automation     Open Access   (Followers: 12)
Journal of Mechanical Engineering Research     Open Access   (Followers: 13)
Journal of Mechanical Engineering Science and Technology     Open Access   (Followers: 1)
Journal of Mechanical Science and Technology     Hybrid Journal   (Followers: 7)
Journal of Mechanical, Civil and Industrial Engineering     Open Access  
Journal of Mechanics     Hybrid Journal   (Followers: 21)
Journal of Mechatronics, Electrical Power, and Vehicular Technology     Open Access   (Followers: 6)
Journal of Microelectromechanical Systems     Hybrid Journal   (Followers: 40)
Journal of Non-Equilibrium Thermodynamics     Hybrid Journal   (Followers: 7)
Journal of Renewable Energy and Mechanics     Open Access   (Followers: 1)
Journal of Statistical Mechanics: Theory and Experiment     Full-text available via subscription   (Followers: 4)
Journal of Strain Analysis for Engineering Design     Hybrid Journal   (Followers: 7)
Journal of the Brazilian Society of Mechanical Sciences     Open Access   (Followers: 2)
Journal of the Brazilian Society of Mechanical Sciences and Engineering     Hybrid Journal   (Followers: 3)
Journal of the Mechanical Behavior of Biomedical Materials     Hybrid Journal   (Followers: 13)
Journal of Theoretical and Applied Mechanics     Open Access   (Followers: 27)
Jurnal Crankshaft     Open Access   (Followers: 3)
Jurnal Energi Dan Manufaktur     Open Access  
Jurnal Taman Vokasi     Open Access  
Jurnal Teknik Mesin     Open Access  
Jurnal Teknik Mesin     Open Access   (Followers: 1)
Latin American Journal of Solids and Structures     Open Access   (Followers: 5)
Lubricants     Open Access   (Followers: 2)
Main Group Metal Chemistry     Open Access   (Followers: 2)
Material Design & Processing Communications     Hybrid Journal  
Mechanical Engineering and Design     Open Access   (Followers: 77)
Mechanical Engineering Research     Open Access   (Followers: 19)
Mechanical Sciences     Open Access   (Followers: 11)
Mechanical Systems and Signal Processing     Hybrid Journal   (Followers: 8)
Media Mesin : Majalah Teknik Mesin     Open Access   (Followers: 7)
Mekanika : Majalah Ilmiah Mekanika     Open Access   (Followers: 1)
Modern Mechanical Engineering     Open Access   (Followers: 60)
MTZextra     Full-text available via subscription  
Open Mechanical Engineering Journal     Open Access   (Followers: 2)
Periodica Polytechnica Mechanical Engineering     Open Access  
Proceedings of the Institution of Mechanical Engineers Part A: Journal of Power and Energy     Hybrid Journal   (Followers: 8)
Proceedings of the Institution of Mechanical Engineers Part B: Journal of Engineering Manufacture     Hybrid Journal   (Followers: 16)
Proceedings of the Institution of Mechanical Engineers Part C: Journal of Mechanical Engineering Science     Hybrid Journal   (Followers: 26)
Proceedings of the Institution of Mechanical Engineers Part D: Journal of Automobile Engineering     Hybrid Journal   (Followers: 17)
Proceedings of the Institution of Mechanical Engineers Part E: Journal of Process Mechanical Engineering     Hybrid Journal   (Followers: 3)
Proceedings of the Institution of Mechanical Engineers Part F: Journal of Rail and Rapid Transit     Hybrid Journal   (Followers: 15)
Proceedings of the Institution of Mechanical Engineers Part G: Journal of Aerospace Engineering     Hybrid Journal   (Followers: 45)
Proceedings of the Institution of Mechanical Engineers Part H: Journal of Engineering in Medicine     Hybrid Journal   (Followers: 3)
Proceedings of the Institution of Mechanical Engineers Part I: Journal of Systems and Control Engineering     Hybrid Journal   (Followers: 15)
Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology     Hybrid Journal   (Followers: 37)
Proceedings of the Institution of Mechanical Engineers Part K: Journal of Multi-body Dynamics     Hybrid Journal   (Followers: 4)
Proceedings of the Institution of Mechanical Engineers Part L: Journal of Materials: Design and Applications     Hybrid Journal   (Followers: 12)
Proceedings of the Institution of Mechanical Engineers Part M: Journal of Engineering for the Maritime Environment     Hybrid Journal   (Followers: 6)
Proceedings of the Institution of Mechanical Engineers Part N: Journal of Nanoengineering and Nanosystems     Hybrid Journal   (Followers: 3)
Proceedings of the Institution of Mechanical Engineers Part O: Journal of Risk and Reliability     Hybrid Journal   (Followers: 7)
Proceedings of the Institution of Mechanical Engineers Part P: Journal of Sports Engineering and Technology     Hybrid Journal   (Followers: 4)
Quantitative InfraRed Thermography Journal     Hybrid Journal   (Followers: 1)
Recent Patents on Mechanical Engineering     Hybrid Journal  
Rekayasa Mesin     Open Access  
Research Papers Faculty of Materials Science and Technology Slovak University of Technology     Open Access   (Followers: 3)
Science China Physics, Mechanics & Astronomy     Hybrid Journal   (Followers: 4)
Scientific Bulletin of Valahia University - Materials and Mechanics     Open Access  
Simetris : Jurnal Teknik Mesin, Elektro dan Ilmu Komputer     Open Access  
Strojarstvo     Full-text available via subscription  
Strojn?cky casopis ? Journal of Mechanical Engineering     Open Access   (Followers: 1)
Technical Reports Mechanical Engineering     Open Access   (Followers: 6)
Trends in Mechanical Engineering & Technology     Full-text available via subscription   (Followers: 3)
Tribologia : Finnish Journal of Tribology     Open Access   (Followers: 2)
Universal Journal of Mechanical Engineering     Open Access   (Followers: 20)
Vestnik of Don State Technical University     Open Access  
Двигуни внутрішнього згоряння     Open Access   (Followers: 1)
Проблемы машиностроения - Mechanical Problems     Open Access   (Followers: 1)

           

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Journal Cover
Facta Universitatis, Series : Mechanical Engineering
Journal Prestige (SJR): 0.227
Citation Impact (citeScore): 1
Number of Followers: 6  

  This is an Open Access Journal Open Access journal
ISSN (Print) 0354-2025 - ISSN (Online) 2335-0164
Published by U of Niš Homepage  [12 journals]
  • CLOUD-BASED EXPERT SYSTEM FOR SYNTHESIS AND EVOLUTIONARY OPTIMIZATION OF
           PLANAR LINKAGES

    • Authors: Rosen Mitrev, Boris Tudjarov, Todor Todorov
      Abstract: The present paper introduces a cloud-based expert system for synthesis and evolutionary optimization of planar linkages. The kinematic structure of the linkage is composed by the modular approach based on Assur’s groups. The dyads are represented as functional blocks with input and output variables. The applied approach for obtaining the geometrical relationships between the input and the output variables of the dyads is based on the use of homogeneous transformation matrices. The developed software system allows a dimensional synthesis of planar linkages by using genetic optimization algorithms. One feature is remote creation of the models of genetic algorithms as well as the receiving of the results by means of a user-friendly interface. By exploiting the application, the user can produce and edit the initial information about the synthesized or optimized linkage; thus he can receive the calculation results as a web page and/or as MS Excel file. An additional mutation of the best chromosome genes by scanning of every gene within its searching space improves the optimal solution. The analyzed numerical case studies show the applicability of the developed software system for mechanism analysis, synthesis and optimization. Because the number of genes is not limited, the linkages with a very big number of design variables can be synthesized by exploiting the developed approach.
      PubDate: 2018-05-29
      Issue No: Vol. 16, No. 1 (2018)
       
  • A NUMERICAL AND EXPERIMENTAL ANALYSIS OF THE DYNAMIC STABILITY OF
           HYDRAULIC EXCAVATORS

    • Authors: Dragoslav Janošević, Jovan Pavlović, Vesna Jovanović, Goran Petrović
      Abstract: The paper presents the results of a numerical and experimental analysis of the dynamic stability of hydraulic excavators. The analysis has employed the software developed on the basis of a defined general dynamic mathematical model of an excavator grounded in Newton-Euler equations as well as the measured quantities of the excavator operating state in exploitation conditions. The defined model is used to model the members of the excavator kinematic chain using rigid bodies while the actuators (hydraulic cylinders and hydraulic motors) of the excavator drive mechanisms are modeled with elastically dampened elements. The elastically dampened characteristics of the actuators are defined with regard to the size of the actuator as well as to the compressibility and temperature of the hydraulic oil used in the excavator hydrostatic drive system. To illustrate the analysis, the paper provides the results of the analysis of the dynamic stability of a 16000 kg tracked excavator equipped with a manipulator digging bucket of 0.6 m3 in capacity.
      PubDate: 2018-05-16
      Issue No: Vol. 16, No. 1 (2018)
       
  • A CRITICAL ASSESSMENT OF KASSAPOGLOU'S STATISTICAL MODEL FOR
           COMPOSITES FATIGUE

    • Authors: Michele Ciavarella, Giuseppe Carbone, Vladimir Vinogradov
      Abstract: Kassapoglou has recently proposed a model for fatigue of composite materials which seems to suggest that the fatigue SN curve can be fully predicted on the basis of the statistical distribution of static strengths. The original abstract writes expressions for the cycles to failure as a function of R ratio are derived. These expressions do not require any curve fitting and do not involve any experimentally determined parameters. The fatigue predictions do not require any fatigue tests for calibration". These surprisingly ambitious claims and attractive results deserve careful scrutiny. We contend that the result, which originates from the reliability theory where exponential distributions is sometimes used to model distribution of failures when age (or wearout) has no influence on the probability of failure, does not conform to a fatigue testing with the resulting SN curve distribution. Despite Kassapoglou's attempt to use a wearout law which seems to confirm this result even with wearout, we contend that a proper statistical treatment of the fatigue process should not make wear-out constants disappear, and hence the SN curves would depend on them, and not just on scatter of static data. These concerns explain the large discrepancies found by 3 independent studies which have tried to apply Kassapoglou's model to composite fatigue data.
      PubDate: 2018-05-15
      Issue No: Vol. 16, No. 1 (2018)
       
  • METHOD OF DIMENSIONALITY REDUCTION IN CONTACT MECHANICS AND FRICTION: A
           USER’S HANDBOOK. III. VISCOELASTIC CONTACTS

    • Authors: Valentin L. Popov, Emanuel Willert, Markus Heß
      Abstract: Until recently the analysis of contacts in tribological systems usually required the solution of complicated boundary value problems of three-dimensional elasticity and was thus mathematically and numerically costly. With the development of the so-called Method of Dimensionality Reduction (MDR) large groups of contact problems have been, by sets of specific rules, exactly led back to the elementary systems whose study requires only simple algebraic operations and elementary calculus. The mapping rules for axisymmetric contact problems of elastic bodies have been presented and illustrated in the previously published parts of The User's Manual, I and II, in Facta Universitatis series Mechanical Engineering [5, 9]. The present paper is dedicated to axisymmetric contacts of viscoelastic materials. All the mapping rules of the method are given and illustrated by examples.
      PubDate: 2018-05-14
      Issue No: Vol. 16, No. 1 (2018)
       
  • A STUDY OF THE ENVIRONMENTAL KUZNETS CURVE FOR TRANSPORT GREENHOUSE GAS
           EMISSIONS IN THE EUROPEAN UNION

    • Authors: Nikola Petrović, Nebojša Bojović, Marijana Petrović, Vesna Jovanović
      Abstract: In view of the European Union as one of the main polluters in the word and the fact that GDP per capita in the European Union is equivalent to the 282 percent of the world`s average, it is interesting to study the relationship between transport GHG emissions and the economic activity within the European Union. In the paper, the authors check the environment Kuznets curve hypothesis for members of the EU over the period 2000-2014. The analysis results show that an inverse-U relationship exists between transport GHG emissions and GDP per capita. At the same time, the results indicate that the change of economic structure has influenced the transport GHG emissions in the developed countries, that is, in the countries that record a higher level of GDP per capita.
      PubDate: 2018-04-15
      Issue No: Vol. 16, No. 1 (2018)
       
  • FOREWORD

    • Authors: Sergey G. Psakhie
      Abstract: Foreword to the thematic issue entitled: Adhesion and Friction: Simulation, Experiment, Applications 
      PubDate: 2018-02-14
      Issue No: Vol. 16, No. 1 (2018)
       
  • NUMERICAL INVESTIGATION OF THE INFLUENCE OF THE DOUBLY CURVED BLADE
           PROFILES ON THE REVERSIBLE AXIAL FAN CHARACTERISTICS

    • Authors: Živan Spasić, Miloš Jovanović, Jasmina Bogdanović-Jovanović, Saša Milanović
      Abstract: Abstract. In reversible axial fans a change in the direction of the impeller rotation is accompanied with a change in the direction of the working fluid flow. To satisfy the flow reversibility, the impeller blades are usually designed with straight symmetrical profiles. The flow reversibility may also be achieved by using asymmetrical blade profiles in which, to satisfy the equality of the leading and trailing angle of the profiles, the mean line of the profile has to have a double curvature in the shape of the stretched letter 'S'. The paper numerically investigates the influence of the doubly curved blade profiles on the reversible axial fan characteristics. Numerical simulations are carried out on an axial fan only with the impeller, with the blades that have double-curved mean line profiles for different values of the angles at the profile ends. For numerical simulation the ANSYS CFX software package is used. Results of the numerical simulation are shown in diagrams Δp(Q), h(Q) and P(Q) at different angles of the profile ends. On the basis of the simulation and analysis of the characteristics, appropriate conclusions are proposed, along with the most advantageous profile of the blades.
      PubDate: 2018-01-18
      Issue No: Vol. 16, No. 1 (2018)
       
  • IMPACT OF SKINFOLD THICKNESS ON WAVELET-BASED MECHANOMYOGRAPHIC SIGNAL

    • Authors: Eddy Krueger, Eduardo M. Scheeren, Carla Daniele Pacheco Rinaldin, André E. Lazzaretti, Eduardo Borba Neves, Guilherme Nunes Nogueira-Neto, Percy Nohama
      Abstract: Surface mechanography (MMG) is a non-invasive technique that captures signs of low-frequency vibrations of skeletal muscles through the skin. However, subcutaneous structures may interfere with the acquisition of MMG signals. The objective of this study was to verify the influence of skinfold thickness (ST) on the MMG wavelet-based signal in the rectus femoris muscle during maximal voluntary contraction in two groups of individuals: group I (n = 10, ST <10 mm ) and group II (n = 10, ST equal to or> 20 mm). Negative correlation was observed between the 19 Hz, 28 Hz and 39 Hz frequency bands with ST. There was a statistical difference in almost all frequency bands, especially in the X and Y axes. All MMG axes in group II presented higher magnitudes in frequency bands 2 and 6 Hz (like low-pass filter). Thus, these results can be applied to calibrate MMG responses as biofeedback systems.
      PubDate: 2018-01-16
      Issue No: Vol. 16, No. 1 (2018)
       
  • ADHESIVE FORCE OF FLAT INDENTERS WITH BRUSH-STRUCTURE

    • Authors: Qiang Li, Valentin L. Popov
      Pages: 1 - 8
      Abstract: We have numerically studied adhesive contact between a flat indenter with brush structure and an elastic half space using the boundary element method. Various surface structures with different size, number and shape of the “pillars”, as well as their distributions (regular or random) have been investigated. The results validate the theoretical prediction that the adhesive force in contact of an indenter with discontinuous areas is roughly proportional to the square root of the real contact density (“filling factor”).
      PubDate: 2018-02-14
      DOI: 10.22190/FUME171220005L
      Issue No: Vol. 16, No. 1 (2018)
       
  • DUGDALE-MAUGIS ADHESIVE NORMAL CONTACT OF AXISYMMETRIC POWER-LAW GRADED
           ELASTIC BODIES

    • Authors: Emanuel Willert
      Pages: 9 - 18
      Abstract: A closed-form general analytic solution is presented for the adhesive normal contact of convex axisymmetric power-law graded elastic bodies using a Dugdale-Maugis model for the adhesive stress. The case of spherical contacting bodies is studied in detail. The known JKR- and DMT-limits can be derived from the general solution, whereas the transition between both can be captured introducing a generalized Tabor parameter depending on the material grading. The influence of the Tabor parameter and the material grading is studied.

      PubDate: 2018-02-14
      DOI: 10.22190/FUME171121003W
      Issue No: Vol. 16, No. 1 (2018)
       
  • ADHESION BETWEEN A POWER-LAW INDENTER AND A THIN LAYER COATED ON A RIGID
           SUBSTRATE

    • Authors: Antonio Papangelo
      Pages: 19 - 28
      Abstract: In the present paper we investigate indentation of a power-law axisymmetric rigid probe in adhesive contact with a "thin layer" laying on a rigid foundation for both frictionless unbounded and bounded compressible cases. The investigation relies on the "thin layer" assumption proposed by Johnson, i.e. the layer thickness being much smaller than the radius of the contact area, and it makes use of the previous solutions proposed by Jaffar and Barber for the adhesiveless case. We give analytical predictions of the loading curves and provide indentation, load and contact radius at the pull-off. It is shown that the adhesive behavior is strongly affected by the indenter shape; nevertheless below a critical thickness of the layer (typically below 1 µm) the theoretical strength of the material is reached. This is in contrast with the Hertzian case, which has been shown to be insensitive to the layer thickness. Two cases are investigated, namely, the case of a free layer and the case of a compressible confined layer, the latter being more "efficient", as, due to Poisson effects, the same detachment force is reached with a smaller contact area. It is suggested that high sensitive micro-/nanoindentation tests may be performed using probes with different power law profiles for characterization of adhesive and elastic properties of micro-/nanolayers.
      PubDate: 2018-02-14
      DOI: 10.22190/FUME180102008P
      Issue No: Vol. 16, No. 1 (2018)
       
  • ADHESIVE WEAR: GENERALIZED RABINOWICZ’ CRITERIA

    • Authors: Valentin L. Popov
      Pages: 29 - 39
      Abstract: In a recent paper in Nature Communications, Aghababaei, Warner and Molinari [5] used quasi-molecular simulations to confirm the criterion for formation of debris, proposed in 1958 by Rabinowicz [4]. The work of Aghababaei, Warner and Molinari improves our understanding of adhesive wear but at the same time puts many new questions. The present paper is devoted to the discussion of possible generalizations of the Rabinowicz-Molinari criterion and its application to a variety of systems differing by the interactions in the interface and by the material properties (elastic and elastoplastic) and structure (homogeneous and layered systems). A generalization of the Rabinowicz-Molinari criterion for systems with arbitrary complex contact configuration is suggested which does not use the notion of "asperity".
      PubDate: 2018-02-14
      DOI: 10.22190/FUME171226004P
      Issue No: Vol. 16, No. 1 (2018)
       
  • SIMULATION OF FRACTURE USING A MESH-DEPENDENT FRACTURE CRITERION IN THE
           DISCRETE ELEMENT METHOD

    • Authors: Andrey Dimaki, Evgeny Shilko, Sergey Psakhie, Valentin Popov
      Pages: 41 - 50
      Abstract: Recently, Pohrt and Popov have shown that for simulation of adhesive contacts a mesh dependent detachment criterion must be used to obtain the mesh-independent macroscopic behavior of the system. The same principle should be also applicable for the simulation of fracture processes in any method using finite discretization. In particular, in the Discrete Element Methods (DEM) the detachment criterion of particles should depend on the particle size. In the present paper, we analyze how the mesh dependent detachment criterion has to be introduced to guarantee the macroscopic invariance of mechanical behavior of a material. We find that it is possible to formulate the criterion which describes fracture both in tensile and shear experiments correctly.
      PubDate: 2018-02-14
      DOI: 10.22190/FUME171229010D
      Issue No: Vol. 16, No. 1 (2018)
       
  • SIMULATION OF WEAR IN A SPHERICAL JOINT WITH A POLYMERIC COMPONENT OF THE
           TOTAL HIP REPLACEMENT CONSIDERING ACTIVITIES OF DAILY LIVING

    • Authors: Vladimir Pakhaliuk, Aleksandr Poliakov
      Pages: 51 - 63
      Abstract: The present study assesses the impact of the main typical activities of patients' daily living (ADL) after total hip arthroplasty (THA) on the wear parameters of sliding couple's materials by simulating linear and volumetric wear according to the Archard's law in a spherical joint with a polymeric element of the total hip replacement (THR). The mathematical wear model, built on the basis of algorithms and custom codes of the finite element analysis in ANSYS and MATLAB software systems, has been studied numerically. The activities used in the model are: level walking, stair ascending-stair descending, chair sitting-chair rising, and deep squatting. They were described by typical waveforms of the angular displacements of the THR's femoral component and the waveforms of the applied force. The results of the simulation show that for the same duration the overall wear value with ADL is significantly higher than in the case of level walking according to the requirements of ISO 14242-1. Therefore, the evaluation of the wear value for ADL is more informative for predicting the functional life time of the THR. Analysis of the simulation results shows that the amount of wear calculated for all activities separately is practically the same as the overall wear value obtained at summary action of ADL. This effect of the independence of contributions to the total amount of wear of each activity makes it possible to significantly simplify the solution of the problem of wear estimation for typical activities, including stochastic ones.
      PubDate: 2018-02-14
      DOI: 10.22190/FUME171226006P
      Issue No: Vol. 16, No. 1 (2018)
       
  • THE “SPORT” OF ROUGH CONTACTS AND THE FRACTAL PARADOX IN WEAR
           LAWS

    • Authors: Michele Ciavarella, Antonio Papangelo
      Pages: 65 - 75
      Abstract: In a recent paper in Science, namely, “The Contact Sport of Rough Surfaces”, Carpick summarizes recent efforts in a “contact challenge” to predict in detail an elastic contact between the mathematically defined fractal rough surfaces under (very little) adhesion. He also suggests the next steps that are needed to “fulfill da Vinci’s dream of understanding what causes friction”. However, this is disappointing as friction has been studied since the times of Leonardo and in 500 years, no predictive model has emerged, nor any significant improvement from rough contact models. Similarly, a very large effort we have spent on the “sport” of studying rough surfaces has not made us any closer to being able to predict the coefficient of proportionality between wear loss and friction dissipation which was already observed by Reye in 1860. Recent nice simulations by Aghababaei, Warner and Molinari have confirmed the criterion for the formation of debris of a single particle, proposed in 1958 by Rabinowicz, as well as Reye’s assumption for the proportionality with frictional loss, which is very close to Archard anyway. More recent investigations under variable loads suggest that Reye’s assumption is probably much more general than Archard’s law. The attempts to obtain exact coefficients with rough surfaces models are very far from predictive, essentially because for fractals most authors fail to recognize that resolution-dependence of the contact area makes the models very ill-defined. We also suggest that in the models of wear, rough contacts should be considered “plastic” and “adhesive” and introduce a new length scale in the problem.
      PubDate: 2018-02-14
      DOI: 10.22190/FUME180109011C
      Issue No: Vol. 16, No. 1 (2018)
       
  • A NUMERICAL STUDY OF THE MICROSCALE PLASTIC STRAIN LOCALIZATION IN
           FRICTION STIR WELD ZONES

    • Authors: Ruslan Balokhonov, Varvara Romanova, Ekaterina Batukhtina, Maxim Sergeev, Evgeniya Emelianova
      Pages: 77 - 86
      Abstract: A crystal plasticity approach was used to study the effects of grain shape and texture on the deformation behavior of friction stir weld (FSW) microregions. The explicit stress-strain analysis was performed for two representative grain structures with equiaxed and extended grains. Grain orientations were assigned to simulate no texture or a weak or strong cubic texture. Calculations have shown that the texture gave rise to earlier plastic strain localization on a larger scale. The highest stresses were found to develop in a non-textured specimen with equiaxed grains where the grain boundaries served as a barrier to dislocation motion. In both equiaxed and extended grain structures with a strong cubic texture no pronounced strain localization was seen on the grain scale but mesoscale shear bands appeared early in the deformation process. The calculations have shown that the microstructure-based simulation is a reasonable tool to study the deformation behavior of FSW materials, which is difficult to be predicted within macroscopic models alone.
      PubDate: 2018-02-14
      DOI: 10.22190/FUME180102012B
      Issue No: Vol. 16, No. 1 (2018)
       
  • FRACTURE MECHANICS SIMPLE CALCULATIONS TO EXPLAIN SMALL REDUCTION OF THE
           REAL CONTACT AREA UNDER SHEAR

    • Authors: Michele Ciavarella
      Pages: 87 - 91
      Abstract: In a very recent paper, Sahli and coauthors [12] (R. Sahli et al., 2018, “Evolution of real contact area under shear”, PNAS, 115(3), pp. 471-476) studied the contact area evolution for macroscopic smooth spheres under shear load in presence of adhesion. It was found that contact area AA reduces quadratically with respect to shear load T, i.e. A=A0-alphaAT2, where A0 is the contact area with no shearing, and alphaA is the "area reduction parameter" found to be approximately proportional to A0-3/2 across 4 orders of magnitude of A0. In this note we focus on the smooth sphere/plane contact because we believe that the case of a rough contact requires separate investigations, and we use a known model of fracture mechanics, which contains a fitting parameter b which governs the interplay between fractures modes, in order to find very good agreement between the data and the analytical predictions, developing relatively simple equations. The interaction with modes is limited.
      PubDate: 2018-02-14
      DOI: 10.22190/FUME180108007C
      Issue No: Vol. 16, No. 1 (2018)
       
  • SOLUTION OF ADHESIVE CONTACT PROBLEM ON THE BASIS OF THE KNOWN SOLUTION
           FOR NON-ADHESIVE ONE

    • Authors: Valentin L. Popov
      Pages: 93 - 98
      Abstract: The well-known procedure of reducing an adhesive contact problem to the corresponding non-adhesive one is generalized in this short communication to contacts with an arbitrary contact shape and arbitrary material properties (e.g. non homogeneous or gradient media). The only additional assumption is that the sequence of contact configurations in an adhesive contact should be exactly the same as that of contact configurations in a non-adhesive one. This assumption restricts the applicability of the present method. Nonetheless, the method can be applied to many classes of contact problems exactly and also be used for approximate analyses.
      PubDate: 2018-02-14
      DOI: 10.22190/FUME180105009P
      Issue No: Vol. 16, No. 1 (2018)
       
 
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