Article
Engineering, Mechanical
Jiaxin Ye, Siqi Yao, Wei Sun, Longlong Li, Jiang Wei, Kaisen Zhang, Kun Liu
Summary: This passage investigates the adhesive processes of loose debris production and transfer to a high surface energy counterface. It proposes a model based on asperity contact and statistical hypotheses, which shows strong predictability in the evolution of transfer film area fraction, independent of debris size.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Ramin Aghababaei, Kai Zhao
Summary: Research has shown that a linear wear relation can be recovered only when material removal progresses by plastic deformation at the asperity tip. However, this linearity breaks down when cleavage cracking dominates the material removal.
Article
Engineering, Chemical
Li Ma, Ramin Aghababaei
Summary: This study uses molecular dynamics simulations to investigate the influence of adhesive strength and abrasion depth on material transfer during nanoscratching of Tungsten. The results show that the coupling between adhesion and abrasion decreases with increasing scratching depth, and there exists a critical adhesive strength as a function of scratching depth at which the material removal mechanism transitions.
Article
Chemistry, Physical
Yunbo Zhang, Abdeljalil Jourani
Summary: The study found that the martensite volume fraction has a significant impact on oxidative wear in 25CD4 dual-phase steel. Both friction coefficient and wear rate increase with higher MVF, leading to an increase in oxidation.
Article
Engineering, Mechanical
Jianqiao Hu, Hengxu Song, Stefan Sandfeld, Xiaoming Liu, Yueguang Wei
Summary: The Archard wear law, widely used to measure material wear, is derived from an idealized asperity flattening model, which cannot accurately represent the real situation with general interlocked asperities. Through molecular dynamics simulations, we found that the Archard law breaks down when fracture dominates the wear, and increasing interfacial adhesion or decreasing material ductility changes the dominant wear factor. We proposed a criterion to determine when the Archard wear law will fail and discussed its applicability to real materials.
TRIBOLOGY INTERNATIONAL
(2022)
Review
Chemistry, Physical
Haibo Zhang, Roman Goltsberg, Izhak Etsion
Summary: This paper reviews the classic work on wear modeling and provides a comprehensive summary of adhesive wear numerical models and techniques based on physical parameters. It investigates wear mechanisms at both the asperity level and rough surfaces, and suggests future work on considering more realistic geometries and material properties for adhesive wear modeling.
Article
Engineering, Mechanical
Feng-Chun Hsia, Fiona M. Elam, Daniel Bonn, Bart Weber, Steve E. Franklin
Summary: The research found that specific ploughing tracks on the flat corresponded to individual asperities on the sphere, leading to lower, more stable friction behavior and mild wear when these asperities were worn-off. It was also discovered that single asperity contact simulations are unreliable in predicting multi-asperity friction and wear behavior for this system.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Biotechnology & Applied Microbiology
Sushil Kandel, Steven Su, Richard M. Hall, Joanne L. Tipper
Summary: Polymer wear debris is a major concern in total joint replacements due to potential biological reactions. This study proposes an automatic particle segmentation algorithm using adaptive thresholding and Convolution Neural Network (CNN) classification. The use of computer algorithms and CNN allows for more efficient analysis of wear debris with complex characteristics, resulting in robust size and volume distribution graphs for estimation.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Stella Brach, Sylvain Collet
Summary: Through numerical simulations, this study reveals the critical condition for adhesive wear, where morphological features and material ductility must meet certain criteria for wear debris to detach.
PHYSICAL REVIEW LETTERS
(2021)
Article
Engineering, Mechanical
Jongsung Park, Byungsoo Joo, Hyungjo Seo, Wansu Song, Jung Ju Lee, Wan Kyu Lee, Ho Jang
Summary: Brake emissions from commercial brake pads were investigated to understand the mechanism of airborne particle generation. The emission factor and particle number concentration were found to be significantly different between low-steel and non-steel brake pads. The size distribution of particles was influenced by the surface topography of the brake pads.
Article
Engineering, Multidisciplinary
Son Pham-Ba, Jean-Francois Molinari
Summary: The use of molecular dynamics (MD) simulations and the discrete element method (DEM) can unravel the atomistic origins of adhesive wear. MD simulations have a high computational cost and are limited to a narrow time and length scale, while DEM can reduce the computational cost and have larger particle diameters and system sizes. Single asperity wear simulations performed with MD can be successfully reproduced with DEM, validating the coarse-graining procedure. DEM allows for more complex simulations and reaching scales inaccessible to MD in the context of adhesive wear.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Wadim Schulz, Vitalij Joukov, Florian Koehn, Wolfgang Engelhart, Veit Schier, Tim Schubert, Joachim Albrecht
Summary: Chromium and silicon are added to improve the performance of TiAlN hard coatings, resulting in high-quality TiAlCrSiN films. The study shows that TiAlCrSiN coating has a higher coefficient of friction and lower wear resistance compared to counterparts made of 100Cr6, with reduced adhesion of wear debris at the TiAlCrSiN surface. These findings contribute to the development of advanced cutting tools, especially for stainless steel.
Article
Chemistry, Multidisciplinary
Yeonuk Seong, Donghyeon Lee, Jihye Yeom, Junhong Park
Summary: The study focused on monitoring friction between two metal surfaces using acoustic signatures extracted from measured noise, showing differences in adhesive and abrasive wear states.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Mechanical
Cyrian Leriche, Steve Franklin, Bart Weber
Summary: In this work, a 6 degrees of freedom topographical difference method based on large atomic force microscopy (AFM) measurements was developed to detect wear at multi-asperity interfaces. The technique was able to detect wear volumes as small as 1.6 x 10(-11) +/- 3.7 x 10(-12) mm(3) (0.016 mu m(3)), beyond the sensitivity of many existing techniques. It was also combined with 100 mN normal force ball-on-flat friction experiments to track nanoscale wear across the entire area of contact.
Article
Engineering, Mechanical
Fernando J. Alamos, Martin Philo, David B. Go, Steven R. Schmid
Summary: This study simulated the contact between a single asperity/rigid tool under constant pressure using finite element modeling and design of experiments, and derived a new contact area expression based on characteristic time of asperity deformation.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Thibault Roch, Efim A. Brener, Jean-Francois Molinari, Eran Bouchbinder
Summary: Frictional sliding is a complex phenomenon influenced by various factors and can lead to self-healing slip pulses. Velocity-driven frictional systems exhibit coarsening dynamics saturated at system length in the sliding direction, resulting in steadily propagating pulses. For sufficiently small system heights, the pulse may be accompanied by periodic elasto-frictional instabilities.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Correction
Materials Science, Multidisciplinary
Vladislav A. Yastrebov, Guillaume Anciaux, Jean-Francois Molinari
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Engineering, Mechanical
Simone Balestra, Gianluca Costagliola, Amedeo Pegoraro, Federico Picollo, Jean-Francois Molinari, Nicola M. Pugno, Ettore Vittone, Federico Bosia, Agusti Sin
Summary: In this study, benchmark experiments were conducted to evaluate the frictional properties of laser patterned low-density polyethylene. It was found that the friction increases with humidity and that the experimental results are in good agreement with numerical simulations. The introduction of a deviation term improved the quantitative results of the model.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2022)
Article
Materials Science, Multidisciplinary
R. Rezakhani, V Rubino, J. F. Molinari, A. Rosakis
Summary: The study investigates dynamic shear ruptures in mode II propagating along a predefined frictional interface of two plates of an elastic material using three-dimensional finite element modeling. The numerical simulations reveal rapid development of out-of-plane stresses in the interior of the specimen and on the interface plane, with complex patterns and a transition from plane-stress to plane-strain conditions during dynamic rupture propagation.
MECHANICS OF MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Tobias Brink, Enrico Milanese, Jean Francois Molinari
Summary: Frictional contacts lead to the formation of a third body, which consists of wear particles and their agglomerates. The behavior and properties of the third body at the nanoscale control macroscopic tribological performance. In this study, large-scale atomistic simulations on a brittle material reveal that the third body transitions from a particle-based state to a shear-band-like state by forming adhesive bridges between the particles. Initially, sliding resistance and wear rate are controlled by surface roughness, but upon agglomeration, friction becomes solely dependent on the real contact area.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Construction & Building Technology
E. R. Gallyamov, A. Leemann, B. Lothenbach, J. -f. Molinari
Summary: This paper studies the possibility of crack growth due to internal loading caused by alkali-silica reaction. The study reveals the dependence of crack growth potential on the shape of the ASR product, particularly spherical and spheroidal shapes. For a chosen material properties and expansion value, there exists a critical spheroid radius below which no crack growth is expected.
CEMENT AND CONCRETE RESEARCH
(2022)
Article
Engineering, Multidisciplinary
Son Pham-Ba, Jean-Francois Molinari
Summary: The use of molecular dynamics (MD) simulations and the discrete element method (DEM) can unravel the atomistic origins of adhesive wear. MD simulations have a high computational cost and are limited to a narrow time and length scale, while DEM can reduce the computational cost and have larger particle diameters and system sizes. Single asperity wear simulations performed with MD can be successfully reproduced with DEM, validating the coarse-graining procedure. DEM allows for more complex simulations and reaching scales inaccessible to MD in the context of adhesive wear.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Mathias Lebihain, Thibault Roch, Jean-Francois Molinari
Summary: The deformation of crack fronts in materials is crucial for understanding the failure properties of micro-structured solids and interfaces, yet the impact of a process zone behind the crack front is often overlooked. Research shows that the presence of a process zone results in competing effects on crack front deformations, impacting the stability and shape of the crack front, and leading to heterogeneities in fracture energy.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Engineering, Chemical
Shijun Yin, Gianluca Costagliola, Jean-Francois Molinari
Summary: We investigate the persistence of micro-contacts between two elastic random rough surfaces using a simple model, finding that the original contact clusters gradually disappear and are replaced by new ones, while the real contact area remains constant. This study sheds light on the microscopic origins of phenomenological rate-and-state friction laws and memory effects observed in frictional sliding.
Article
Engineering, Mechanical
S. Z. Wattel, J. Garcia-Suarez, J. -f. Molinari
Summary: When two rough surfaces slide against each other, either ductile behavior or brittle behavior can be observed. A critical length scale has been identified to control the transition between these two behaviors. This study extends the work to simple heterogeneous materials with random fluctuations, and finds that local variations influence the global behavior. Local fluctuations make the heterogeneous material weaker but increase the overall ductility.
EXTREME MECHANICS LETTERS
(2022)
Article
Construction & Building Technology
E. R. Gallyamov, M. Shakoorioskooie, J. -F. Molinari
Summary: This paper presents a novel finite element model for simulating the alkali-silica reaction in a realistic concrete meso-structure. The model is able to simulate complex crack patterns and has been validated by matching experimental data.
CEMENT AND CONCRETE RESEARCH
(2022)
Article
Engineering, Civil
E. R. Gallyamov, M. Corrado, J. Fauriel, J. -f. Molinari
Summary: This paper aims to analyze a concrete gravity dam in Western Switzerland using a 2D thermo-mechanical multi-scale ASR model. The simulation results are compared to field measurements and observations. The analysis reveals that temperature variation has a negligible effect on ASR advancement, and the difference in length between the upstream and downstream faces is the main reason for upstream drift at the crest level. The study also shows that ASR-related expansion anisotropy and cracks alignment are more pronounced in the upstream part and the foundation, which can be attributed to the transmission of self-weight and the constraining effect of underlying rock.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Multidisciplinary
Manon Voisin-Leprince, Joaquin Garcia-Suarez, Guillaume Anciaux, Jean-Francois Molinari
Summary: This paper discusses the multiscale modeling of a granular material trapped between continuum elastic domains. The granularity of the granular region is modeled using the discrete element method (DEM), while the elastic regions are represented by two continuum domains using the finite element method (FEM). The paper presents two different strategies for coupling the discrete and continuum domains to properly transmit waves between them. The confinement pressure results in the appearance of ghost forces, which are addressed using overlapping coupling strategies. The paper also compares the performance of the strategies and analyzes the propagation of waves through the interface.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Ramin Aghababaei, Emily E. Brodsky, Jean-Francois Molinari, Srinivasan Chandrasekar
Summary: This article reviews recent advances in understanding the origins of roughness on natural and engineered surfaces and their connection with subsurface deformation mechanisms. Directions for future research are discussed.
Article
Materials Science, Multidisciplinary
Joaquin Garcia-Suarez, Tobias Brink, Jean-Francois Molinari
Summary: Building on an analogy to ductile fracture mechanics, this study investigates the energetic cost of debris particle creation during adhesive wear. The study reveals deviations from linearity at the microscopic scale and provides a theoretical foundation to estimate the statistical distribution of sizes of fine particles emitted due to adhesive wear processes.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Yanzheng Wang, Qian Wu, Yiran Tian, Guoliang Huang
Summary: This paper proposes the microstructure design of an odd plate and investigates the directional wave energy amplification and the presence of interface waves in odd plates through theoretical and numerical analysis. The research findings contribute to the understanding of elastic behavior in 2D non-Hermitian systems.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
F. Greco, D. Codony, H. Mohammadi, S. Fernandez-Mendez, I. Arias
Summary: This study overcomes the difficulty of harnessing the flexoelectric effect by designing multiscale metamaterials. Through topology optimization calculations, we obtain optimal structures for various apparent piezoelectric properties and find that low-area-fraction lattices are the preferred choice. The results show competitive estimations of apparent piezoelectricity compared to reference materials such as quartz and PZT ceramics.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Xiaoxuan Zhang, Tryaksh Gupta, Zhenlin Wang, Amalie Trewartha, Abraham Anapolsky, Krishna Garikipati
Summary: This study presents a computational framework for coupled electro-chemo-(nonlinear) mechanics at the particle scale in solid-state batteries, including interfacial fracture, degradation in charge transfer, and stress-dependent kinetics. The discontinuous finite element method allows for arbitrary particle shapes and geometries.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Chengguan Zhang, Xavier Balandraud, Yongjun He
Summary: The coexistence of both austenite and martensite is a common characteristic in Shape Memory Alloys (SMAs). The multiple-domain microstructures, consisting of austenite, martensite twins, and individual martensite variants, evolve collectively during the phase transformation, affecting the material's macroscopic response. This paper presents an experimentally observed interface consisting of five domains in a Ni-Mn-Ga single-crystal, and analyzes the effects of thermal loading path and material initial state on the domain pattern formation.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Shaobao Liu, Haiqian Yang, Guang-Kui Xu, Jingbo Wu, Ru Tao, Meng Wang, Rongyan He, Yulong Han, Guy M. Genin, Tian Jian Lu, Feng Xu
Summary: The balance between stress and adhesion plays a crucial role in governing the behaviors of adherent cells, such as cell migration. In certain microenvironments, such as tumor, variations in hydrostatic pressure can significantly impact cell volume and adhesion, which in turn affects cell behavior.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Xun Xiong, Qinglei Zeng, Yonghuan Wang, Ying Li
Summary: In this work, the authors investigate the possibility of enhancing the resistance to crack growth in brittle materials through microstructure design. They establish a computational framework to simulate crack propagation and characterize fracture energy. The effects of different types of voids on toughening mechanisms are explored, and the critical conditions for embrittlement-toughening transition are identified. The study also discusses the difference between void toughening in brittle and ductile materials, and extends the toughening strategy to nacre-like materials.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Huan Wang, Yong-Quan Liu, Jiu-Tao Hang, Guang-Kui Xu, Xi-Qiao Feng
Summary: This study establishes a cytoarchitectural model to accurately capture the buckling and postbuckling behaviors of epithelia under fast compression. The stress evolution of epithelia is divided into three stages: loading, phase transition, and stress recovery. The postbuckling process is governed by the active tension generated by the actomyosin network. The study also proposes a minimal model that predicts the flattening time and stress recovery extent as functions of applied strain or strain rate, in agreement with simulations and experiments.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Lei Liu, Hao Liu, Yuming He, Dabiao Liu
Summary: This study investigates the mechanics and topologically complex morphologies of twisted rubber filaments using a combination of experiment and finite strain theory. A finite strain theory for hyperelastic filaments under combined tension, bending, and torsion has been established, and an experimental and theoretical morphological phase diagram has been constructed. The results accurately determine the configuration and critical points of phase transitions, and the theoretical predictions agree closely with the measurements.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Abhishek Painuly, Kunnath Ranjith, Avinash Gupta
Summary: This paper analyzes the interfacial waves caused by frictional slipping and studies their dispersion relation and wave modes. By studying the slip waves in a geophysical model, the surface wave dispersion phenomenon is explored, and an alternative explanation is proposed.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Houlin Xu, Joshua Vievering, Hoang T. Nguyen, Yupeng Zhang, Jia-Liang Le, Zdenek P. Bazant
Summary: Motivated by the extraordinary strength of nacre, this study investigated the probabilistic distribution of fishnet strength using Monte Carlo simulations and found that previous analytical solutions are not applicable for fishnets with a large number of links. By approximating large-scale fishnets as a continuum with cracks or holes, the study revealed that the strength distribution follows the Weibull distribution. This new model has significance for optimizing the strength-weight ratio in printed material structures.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Souhayl Sadik, Arash Yavari
Summary: This paper revisits the mathematical foundations of nonlinear viscoelasticity and studies the geometry of viscoelastic deformations. It discusses the decomposition of the deformation gradient into elastic and viscous distortions and concludes that the viscous distortion can only be a two-point tensor. The governing equations of nonlinear viscoelasticity are derived and the constitutive and kinetic equations for various types of viscoelastic solids are discussed.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Wen Cheng, Hongkuan Zhang, Yu Wei, Kun Wang, Gengkai Hu
Summary: In this study, we propose a phenomenon similar to Thouless pumping for a continuous in-plane elastic system, enabling topological transport of elastic waves through spatial modulation of material elasticity. By incorporating specific lattice microstructures, termed pentamode materials, precise and robust control over elastic wave propagation is achieved.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Linda Werneck, Mertcan Han, Erdost Yildiz, Marc-Andre Keip, Metin Sitti, Michael Ortiz
Summary: We have developed a simple model that describes the ionic current through neuronal membranes by considering the membrane potential and extracellular ion concentration. The model combines a simplified Poisson-Nernst-Planck model of ion transport through individual ion channels with channel activation functions calibrated from experimental data. The calibrated model accounts for the transport of calcium, sodium, potassium, and chloride and shows remarkable agreement with experimentally measured current-voltage curves for human neural cells.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)