Article
Mechanics
Uraching Chowdhury, Melih Eriten
Summary: Presliding contacts are critical in determining the dynamic response of assembled structures. However, current modeling approaches fail to capture load-dependent nonlinearities in these contacts, especially for materials with nonlinear viscoplastic response. This study aims to numerically model and investigate the influence of nonlinear material response on the presliding response of spherical contacts. The results confirm that nonlinear viscoplasticity significantly affects the tangential stiffness and dissipation in high normal preloads.
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2023)
Article
Engineering, Mechanical
Haibo Zhang, Izhak Etsion
Summary: The literature describes a surprising behavior of ultrathin soft coatings on harder substrates, where existing finite element models fail to explain the discontinuity in static friction coefficients. A new model based on the coupled Eulerian-Lagrangian method is able to capture this unexpected behavior and provide a reliable scientific explanation for experimental observations.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2021)
Article
Multidisciplinary Sciences
Owen Brazil, John B. Pethica, George M. Pharr
Summary: Microscale friction experiments on diamond/metal and diamond/silica contacts show that sink-in occurs when sliding on metallic substrates, increasing the contact area, while sink-in is less common in fused silica. The transition from sink-in to ploughing is mediated by failure of the contact interface, indicated by a sharp increase in energy dissipation. At lower contact pressures, elastic interfacial sliding behavior characteristic of scanning probe or surface force apparatus experiments is recovered, bridging the gap between nanotribology and plasticity-dominated macroscale friction.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2021)
Article
Computer Science, Interdisciplinary Applications
Julio Blanco-Lorenzo, Sheng Liu, Javier Santamaria, Paul A. Meehan, Ernesto G. Vadillo
Summary: Numerical analyses were conducted on the roller-raceway contact in a spherical roller bearing using frictional contact models of varying complexity. The study utilized models such as CECT (Conformal Exact Contact Theory) based on Kalker's exact contact theory and detailed Finite Element models. The adequacy of simplified contact solutions was evaluated by comparing them with solutions obtained from more comprehensive models. Additionally, the application of the exact contact theory, commonly used in wheel-rail systems, was demonstrated in contact mechanics analyses of rolling bearings, including implementation details. Different normal loads and friction levels were analyzed, leading to the identification of two distinct steady equilibrium configurations for the roller.
JOURNAL OF COMPUTATIONAL DESIGN AND ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Justin D. Glover, Xingwei Yang, Rong Long, Jonathan T. Pham
Summary: Glover et al. investigate the lateral motion of microparticles on a soft, adhesive surface and find that a moving microparticle can induce a cease at the leading front of the surface due to compressive stress buildup. They also discover that the surface forms a self-contacting crease at the leading front, and simulations show that interfacial strength plays a dominant role in the formation of the crease. The crease then propagates through the contact zone in a Schallamach wave-like fashion, facilitated by free slip at the adhesive, self-contacting interface.
NATURE COMMUNICATIONS
(2023)
Article
Engineering, Mechanical
Fitsum B. Tewelde, Tianfeng Zhou, Jia Zhou, Weijia Guo, Bin Zhao, Xiangyu Ge, Wenzhong Wang, Xiaoli Wang, Xibin Wang
Summary: This study examined the impact of asymmetric surface texturing on directional friction in a dry environment. Asymmetric micro-grooves were created on an electroless nickel phosphorous (Ni-P) plated disk using a diamond cutting process. Sliding tests were conducted in both clockwise (CW) and counter-clockwise (CCW) directions against polyether-ether-ketones (PEEK) material at various texture densities. The results indicate that asymmetric surface texturing has a significant effect on directional friction. At a texture density of 70%, the friction coefficient in the CW direction increased by 28.1% compared to the CCW direction. The lowest texture density caused a 61.3% increase in friction coefficient during CW rotation compared to the reference untextured surface.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Ilaria Ghezzi, Davide Tonazzi, Michael Rovere, Cedric Le Coeur, Yves Berthier, Francesco Massi
Summary: This study focuses on the impact of the complex rheology of lubricants on the evolution of friction coefficients at extremely low sliding velocities in greased contacts. By conducting tests on a dedicated tribometer, it was found that there is a non-trivial relationship between friction and velocity within the investigated velocity range.
TRIBOLOGY INTERNATIONAL
(2021)
Review
Chemistry, Physical
Sepehr Salari, Ali Beheshti
Summary: The paper discusses the influence of creep on contact and frictional properties, particularly in applications with high local loading. Various models for creeping contacts and friction under different material properties and loading conditions are evaluated.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Lucas Frerot, Alexia Crespo, Jaafar A. El-Awady, Mark O. Robbins, Juliette Cayer-Barrioz, Denis Mazuyer
Summary: The required tangential force for slip across a frictional interface can increase due to aging processes, including creep, chemical, or structural changes. In this study, the interplay between surface roughness and molecular motion within adsorbed monolayers explains the macroscopic friction response. Contact junctions and their dynamics are studied experimentally and computationally to understand their role in structural aging.
Article
Engineering, Civil
Le Chen, Xin Ruan, Xiaonong Guo, Wei Chen, Lilei Fu
Summary: A new rate-independent friction model is proposed in this paper to describe the quasi-static frictional process in structural engineering. The model, which is more engineering-oriented, can be easily applied in finite element analysis and shows comparable accuracy to existing test models. It is able to predict the energy dissipation and the stiffness deviation at the pre-sliding regime, and the impacts of contact curvature and coverage on the coefficient of static friction are assessed. The model is verified through a friction test and applied to a pedestrian bridge, showing good prediction and limited mechanical residuals.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Mechanical
Hao Chen, Xinlei Gao
Summary: The relationship between contact size (A) and static friction (f) in rigid crystalline systems is determined by both commensurability and contact shape. For commensurate contacts, f is proportional to A and independent of shape, while for incommensurate contacts, the relationship between f and A varies depending on the shape, with different exponents ranging from 0 to 1/2. The commensurability of a contact can be easily changed by perturbation of the misfit angle, which suggests further research is necessary when considering lateral forces and surface deformations in real systems.
Article
Materials Science, Multidisciplinary
R. Shah, G. H. M. van der Heijden
Summary: We develop a comprehensive theory for an end-loaded elastic rod constrained to deform on a cylindrical surface, considering various friction models. Our results are applicable in engineering and medical applications involving slender structures winding inside or outside a cylindrical boundary, providing insights into buckling and lifting off behavior under different loads.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Mathematics, Applied
R. V. Namm, G. I. Tsoy
Summary: This paper investigates a contact problem between an elastic body and an absolutely rigid foundation, considering Signorini contact conditions and Coulomb friction law. The proposed method based on the Uzawa algorithm and modified Lagrange functionals effectively solves the auxiliary problem and proves the theoretical convergence of the method.
JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS
(2023)
Article
Mathematics, Applied
Franz Chouly, Patrick Hild, Vanessa Lleras, Yves Renard
Summary: We investigated the Nitsche-based finite element method for contact problems with Coulomb friction, considering both static and dynamic situations. By assuming appropriate physical and numerical parameters, we established existence and/or uniqueness results for the discretized problems. Numerical studies were conducted to complement these theoretical results.
JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS
(2022)
Article
Engineering, Mechanical
Luigi Romano, Francesco Timpone, Fredrik Bruzelius, Bengt Jacobson
Summary: This paper investigates the rolling dynamics of spherical wheels using the theoretical framework of brush models. Different types of kinematics are considered and solutions for both steady-state and transient behaviors are derived. It is found that shear stresses inside the contact patch grow unbounded if the deflection of the bristle is not taken into account.
MECHANISM AND MACHINE THEORY
(2022)
Article
Engineering, Mechanical
Xiao Huang, Izhak Etsion, Tianmin Shao
Article
Engineering, Mechanical
R. Goltsberg, I. Etsion
Article
Engineering, Mechanical
Zhou Chen, Roman Goltsberg, Izhak Etsion
TRIBOLOGY INTERNATIONAL
(2016)
Article
Engineering, Mechanical
R. Goltsberg, I. Etsion
TRIBOLOGY INTERNATIONAL
(2016)
Article
Engineering, Mechanical
M. Kalin, A. Pogacnik, I. Etsion, B. Raeymaekers
TRIBOLOGY INTERNATIONAL
(2016)
Article
Engineering, Mechanical
M. Bar-Hen, I. Etsion
TRIBOLOGY INTERNATIONAL
(2017)
Article
Engineering, Mechanical
Z. Chen, R. Goltsberg, I. Etsion
TRIBOLOGY INTERNATIONAL
(2017)
Article
Engineering, Mechanical
Shai Ronen, Roman Goltsberg, Izhak Etsion
Article
Engineering, Mechanical
R. Goltsberg, S. Levy, Y. Kligerman, I Etsion
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2018)
Article
Engineering, Mechanical
Z. Chen, R. Goltsberg, I. Etsion
TRIBOLOGY INTERNATIONAL
(2018)
Article
Engineering, Manufacturing
Oleg Korchevnik, Roman Goltsberg, Yuri Kligerman, Izhak Etsion
IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY
(2018)
Article
Engineering, Mechanical
Ori Stav, Haytam Kasem, Rozalia Akhvlediani, Alon Hoffman, Yuri Kligerman, Izhak Etsion
TRIBOLOGY INTERNATIONAL
(2019)
Article
Engineering, Mechanical
Z. Chen, I. Etsion
TRIBOLOGY INTERNATIONAL
(2019)
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
Materials Science, Multidisciplinary
A. M. Kovalchenko, A. Erdemir, O. O. Ajayi, I. Etsion
MATERIALS PERFORMANCE AND CHARACTERIZATION
(2017)