An Elastic-Plastic Model for the Contact of Rough Surfaces

1987 ◽  
Vol 109 (2) ◽  
pp. 257-263 ◽  
Author(s):  
W. R. Chang ◽  
I. Etsion ◽  
D. B. Bogy
Keyword(s):  
Plastic Deformation ◽  
Control Volume ◽  
Rough Surfaces ◽  
Numerical Results ◽  
Volume Conservation ◽  
Plastic Model ◽  
Elastic Plastic ◽  
Asperity Model

An elastic-plastic asperity model for analyzing the contact of rough surfaces is presented. The model is based on volume conservation of an asperity control volume during plastic deformation. Numerical results obtained from this model are compared with other existing models that are either purely elastic or purely plastic. It is shown that these models are limiting cases of the more general elastic-plastic model presented here. Some of the results obtained deviate appreciably from previous analyses which do not consider asperity volume conservation.

Elastic-Plastic Adhesive Contact of Rough Surfaces Based on Accurate FEA Study Using N-Point Asperity Model

2014 ◽  
Vol 2 (2) ◽  
pp. 1-22
Author(s):  
Ajay K. Waghmare ◽  
Prasanta Sahoo
Keyword(s):  
Plastic Deformation ◽  
Rough Surfaces ◽  
Adhesive Contact ◽  
Plasticity Index ◽  
Asperity Contact ◽  
Element Analysis ◽  
Elastic Plastic ◽  
Significant Difference ◽  
Asperity Model ◽  
Adhesion Index

The paper describes a theoretical study of elastic-plastic adhesive contact of rough surfaces based on n-point asperity model and accurate finite element analysis (FEA) of elastic-plastic deformation of single asperity contact. The n-point asperity model developed by Hariri et al (2006) is integrated with the elastic-plastic model of . In this study an attempt is made to extend the work of by incorporating intermediate elastic-plastic regime of deformation. A large range of interference values ranging from fully elastic through elastic-plastic to fully plastic deformation of contacting asperities is considered. The effect of varying load and material parameters is analyzed in terms of well established adhesion index and plasticity index. A comparison between the present analysis with that of model shows significant difference in load–separation behaviour depending on combinations of mean separation, adhesion index and plasticity index.

A statistical model of elastic-plastic contact between rough surfaces

2019 ◽  
Vol 43 (1) ◽  
pp. 38-46 ◽  
Author(s):  
Guang Zhao ◽  
Sheng-xiang Li ◽  
Zhi-liang Xiong ◽  
Wen-dong Gao ◽  
Qing-kai Han
Keyword(s):  
Plastic Deformation ◽  
Interface Design ◽  
Present Model ◽  
Rough Surfaces ◽  
Contact Stiffness ◽  
Contact Point ◽  
Contact Model ◽  
Elastic Plastic ◽  
Classical Models ◽  
Asperity Deformation

In a mechanical interface, the contact surface topography has an important influence on the contact stiffness. In the contact processes of asperities, elastic-plastic change can lead to discontinuity and lack of smoothness at a critical contact point. The result is a large difference between the elastic-plastic deformation and the actual asperity deformation. Based on Hertz contact theory, the heights of asperities on a rough surface obey a Gaussian distribution. To take into consideration the continuity of elastic-plastic asperity deformation, we divide the elastic-plastic deformation into three stages: pre-elastic-plastic, mid-elastic-plastic, and post-elastic-plastic deformation. This establishes an elastic-plastic contact model of asperity at a continuous critical point. The contact model of a single asperity fits well with the Kogut–Etsion model and the Zhao–Maietta–Chang model, and the variation trend is consistent. At a lower plastic index, the present model coincides with classical models of contact area and contact load. At a higher plastic index, the simulation results of the present model differ from the Greenwood–Williamson model and the Chang–Etsion–Bogy model but are similar to results from the Kogut–Etsion and Zhao–Maietta–Chang models. This study provides a more accurate microscopic contact model for rough surfaces and a theoretical framework for interface design and analysis.

An elastic-plastic model for the contact of anisotropic rough surfaces

Wear ◽  
1991 ◽  
Vol 146 (2) ◽  
pp. 201-218 ◽  
Author(s):  
H. So ◽  
D.C. Liu
Keyword(s):  
Rough Surfaces ◽  
Plastic Model ◽  
Elastic Plastic

scholarly journals New analytical model of elastic-plastic contact for three-dimensional rough surfaces considering interaction of asperities

Friction ◽  
2021 ◽  
Author(s):  
Yuqin Wen ◽  
Jinyuan Tang ◽  
Wei Zhou ◽  
Lin Li ◽  
Caichao Zhu
Keyword(s):  
Plastic Deformation ◽  
Surface Science ◽  
Calculation Method ◽  
Rough Surfaces ◽  
Contact Stiffness ◽  
Three Dimensional ◽  
Correction Method ◽  
Elastic Plastic ◽  
Contact Distance ◽  
The Matrix

AbstractThe contact calculation of three-dimensional real rough surfaces is the frontier field of tribology and surface science. In this study, we consider the interaction and elastic-plastic deformation characteristics of asperities and further, propose an analytical contact calculation method for rough surfaces considering the interaction of asperities. Based on the watershed algorithm, the rough surface is segmented and the asperities are reconstructed into ellipsoids. According to the height relationship between the asperities, the definition of the deformation reference height of the matrix between each couple of asperities is provided. Subsequently, the calculation formula of the substrate deformation is provided according to the local contact pressure considering the elastic-plastic deformation of the asperity, and the contact state under a specific load is determined using the iterative correction method. The results correspond with those of finite element numerical calculation and the study reveals the following: (1) compared with the results obtained without considering the asperity interaction, contact area, distance, and stiffness will be reduced by 6.6%, 19.6%, and 49.5%, respectively, when the influence of asperity interaction is considered; (2) the interaction of the asperities has the greatest influence on the surface contact distance and stiffness. Under the same load, the existence of asperity interaction will reduce the contact distance, area, and stiffness; (3) considering the interaction of the asperities, the higher asperity will bear more load, but it will simultaneously reduce the contact of the surrounding area and increase that of the distant area. The calculation method proposed in this study has the advantages of high calculation efficiency and accuracy, thus, providing the calculation basis and method for subsequent studies on service performance of rough surfaces, such as the calculation of contact stiffness and fatigue performance analysis of rough surfaces.

Modification of the elastic-plastic model for the contact of rough surfaces

Wear ◽  
1991 ◽  
Vol 150 (1-2) ◽  
pp. 79-88 ◽  
Author(s):  
D.G. Evseev ◽  
B.M. Medvedev ◽  
G.G. Grigoriyan
Keyword(s):  
Rough Surfaces ◽  
Plastic Model ◽  
Elastic Plastic

Experimental Considerations in Single Asperity Interactions

2011 ◽  
Author(s):  
Daniel J. Burbridge ◽  
Sergey N. Gordeev
Keyword(s):  
Experimental Data ◽  
Plastic Deformation ◽  
Contact Mechanics ◽  
Friction And Wear ◽  
Rough Surfaces ◽  
Simulation Methods ◽  
Elastic Plastic ◽  
Single Asperity ◽  
Electron Imaging ◽  
Significant Effort

In the interest of understanding contact mechanics, friction and wear processes where plastic deformation occurs between rough surfaces, significant effort has and continues to be applied to understand single asperity elastic-plastic contacts. The main tools used in obtaining experimental data with which to inform and validate simulation methods in this area of study are nano and micro indenters. This article presents some of the less commonly considered phenomena which may affect the interpretation of experimental data from such apparatus. The interpretation of AFM pull off data is briefly discussed and invasive effects of electron imaging are highlighted.

Elastic–plastic adhesive contact of rough surfaces usingn-point asperity model

2009 ◽  
Vol 42 (6) ◽  
pp. 065302 ◽  
Author(s):  
Prasanta Sahoo ◽  
Anirban Mitra ◽  
Kashinath Saha
Keyword(s):  
Rough Surfaces ◽  
Adhesive Contact ◽  
Elastic Plastic ◽  
Asperity Model
Sign in / Sign up

Export Citation Format

Share Document