An Adhesive Wear Model of Fractal Surfaces in Normal Contact

2008 ◽  
Author(s):  
X. Yin ◽  
K. Komvopoulos
Keyword(s):  
Interfacial Adhesion ◽  
Adhesive Wear ◽  
Adhesion Force ◽  
Plastic Material ◽  
Normal Load ◽  
Asperity Contact ◽  
Wear Coefficient ◽  
Wear Model ◽  
Normal Contact ◽  
Fractal Surfaces

A generalized adhesive wear model was derived for three-dimensional fractal surfaces in normal contact. A criterion for wear particle formation was derived based on the critical asperity contact area for fully plastic asperity deformation, taking into account the contribution of the adhesion force to the total normal load applied at the contact interface. The analysis yields a relationship of the adhesive wear coefficient in terms of total normal load (global interference), fractal parameters, elastic-plastic material properties, surface energies, material compatibility, and interfacial adhesion characteristics of the contacting rough surfaces. Numerical results of the wear coefficient of representative engineering material systems illustrate the roles of global interference and interfacial adhesion conditions (lubrication effect) in adhesive wear of surfaces in normal contact.

An Abrasive Wear Model of Fractal Surfaces Based on the Slip–Line Theory of Plasticity

2009 ◽  
Author(s):  
X. Yin ◽  
K. Komvopoulos
Keyword(s):  
Abrasive Wear ◽  
Slip Line ◽  
Interfacial Adhesion ◽  
Plastic Material ◽  
Normal Load ◽  
Wear Particle ◽  
Wear Coefficient ◽  
Wear Model ◽  
Line Field ◽  
Fractal Surfaces

A generalized abrasive wear model of a three-dimensional rough (fractal) surface sliding against a relatively softer material is presented. The model is based on a slip-line field of a rigid spherical asperity (or spherical wear particle) that plows through a soft surface, resulting in material removal by a microcutting process. The analysis yields a relationship of the abrasive wear coefficient in terms of the interfacial adhesion characteristics of the interacting surfaces, topography (fractal) parameters, elastic-plastic material properties, and applied normal load. Numerical results illustrate the effects of surface roughness and interfacial adhesion (lubrication effect) on the abrasive wear coefficient of fractal surfaces.

Adhesive Wear Based on Accurate FEA Study of Asperity Contact and n-Point Asperity Model

2016 ◽  
Vol 4 (1) ◽  
pp. 1-24
Author(s):  
Ajay K. Waghmare ◽  
Prasanta Sahoo
Keyword(s):  
Adhesive Wear ◽  
Complete Solution ◽  
Wear Particle ◽  
Wear Volume ◽  
Asperity Contact ◽  
Wear Model ◽  
Element Analysis ◽  
Particle Generation ◽  
Elastic Plastic ◽  
Asperity Model

The paper describes a theoretical study of adhesive wear based on accurate finite element analysis (FEA) of elastic-plastic contact of single asperity and n-point asperity model. The wear model developed considers wear particle generation in whole range of deformation, ranging from fully elastic through elastic-plastic to fully plastic. Well defined adhesion index and plasticity index are used to study the prospective situations arising out of variation in load, material properties, and surface roughness. It is observed that the wear volume at particular level of separation increases with increase in plastic deformation and adhesion effect. Materials having higher tendency to adhesion show higher wear rate. Trend of the results obtained is found in line with the existing solutions which are modeled with conventional asperity concept. Inclusion of separate formulations for intermediate state of deformation of asperities which are based on accurate FEA study gives complete solution.

Wear Behavior of Carbon Steels

Tribology ◽  
2006 ◽  
Author(s):  
Ahmed A. Akbar ◽  
Farag M. Shuaeib ◽  
Aimen M. Younis
Keyword(s):  
Working Conditions ◽  
Wear Behavior ◽  
Normal Load ◽  
Testing Machine ◽  
Carbon Steels ◽  
Wear Testing ◽  
Volume Loss ◽  
Wear Coefficient ◽  
Normal Contact ◽  
Rotating Speed

The present work is concerned with study the wear behavior of 1020, 1060, and 1095 steels under different wear conditions, rotating contact speeds (500,850, and 1200 rpm) and normal contact loads (50,100,150 and 200 N) using pin on wheel wear testing machine. The prepared specimens were normalized to make sure that all types of steels are in the same structure. Wear testing results were recorded by measuring weight loss at different contact times (10, 20, 30, 60 and 90 min). The aim of this paper was to study the effect of normal loads and rotating speeds and their interactions on wear behavior of steels under various continuous sliding contact times. The presented relations between the volume loss and working conditions showed that low carbon steel had wear loss higher than other carbon content. In addition, results for all types showed that lower rotating speed had higher effect than other speeds and high normal load had higher effect than other loads. The highest volume loss was observed at high normal load and low rotating speed. And the relation between wear coefficient and working conditions was also observed that wear coefficient decreases as both normal load and rotating speed increase.

A Dynamic Wear Model for Micro-Grooved Water-Lubricated Bearings Under Transient Mixed Lubrication Condition

2020 ◽  
Vol 142 (7) ◽  
Author(s):  
Guo Xiang ◽  
Yanfeng Han ◽  
Tao He ◽  
Jiaxu Wang ◽  
Ke Xiao
Keyword(s):  
Friction Coefficient ◽  
Sliding Wear ◽  
Boundary Friction ◽  
Radial Clearance ◽  
Asperity Contact ◽  
Wear Coefficient ◽  
Wear Model ◽  
Surface Parameters ◽  
Simulation Results ◽  
Dynamic Wear

Abstract The study presents a dynamic wear model for micro-grooved water-lubricated bearings considering the transient mixed elastohydrodynamic lubrication (mixed-EHL) condition. In the established model, the modified Archard wear model and the mixed-EHL model are bridged to study the transient interdependent relationship between the sliding wear behavior and the mixed-EHL performance. In order to consider the effect of the transient mixed-EHL performance on the sliding wear, the Archard model is extended to include the time-varying wear coefficient based on the fatigue concept. To verify the presented model, the comparisons with the experimental results available in the literatures have been conducted. In this study, the evolution of the wear and mixed-EHL performance distribution over time is predicted, and the impact of the radial clearance, boundary friction coefficient, and surface parameters on the numerical predictions is evaluated. The simulation results reveal that the worn region moves toward the rotational direction slowly. The simulation results also reveal that the wear rate and the wear coefficient first decrease considerably, and then decrease gently, and the sliding wear geometry promotes the hydrodynamic effects and reduces the asperity contact during the operation. Furthermore, the parametric study demonstrates that dynamic wear and mixed-EHL performance is sensitive to the radial clearance, boundary friction coefficient, and surface parameters.

scholarly journals Simulation and Experimental Study on Wear of U-Shaped Rings of Power Connection Fittings under Strong Wind Environment

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 735
Author(s):  
Songchen Wang ◽  
Xianchen Yang ◽  
Xinmei Li ◽  
Cheng Chai ◽  
Gen Wang ◽  
...  
Keyword(s):  
Abrasive Wear ◽  
Adhesive Wear ◽  
Surface Hardness ◽  
Wear Depth ◽  
Strong Wind ◽  
Wear Model ◽  
Wind Environment ◽  
Simulation Results ◽  
Oxidation Wear ◽  
Good Agreement

The objective of this study was to investigate the wear characteristics of the U-shaped rings of power connection fittings, and to construct a wear failure prediction model of U-shaped rings in strong wind environments. First, the wear evolution and failure mechanism of U-shaped rings with different wear loads were studied by using a swinging wear tester. Then, based on the Archard wear model, the U-shaped ring wear was dynamically simulated in ABAQUS, via the Umeshmotion subroutine. The results indicated that the wear load has an important effect on the wear of the U-shaped ring. As the wear load increases, the surface hardness decreases, while plastic deformation layers increase. Furthermore, the wear mechanism transforms from adhesive wear, slight abrasive wear, and slight oxidation wear, to serious adhesive wear, abrasive wear, and oxidation wear with the increase of wear load. As plastic flow progresses, the dislocation density in ferrite increases, leading to dislocation plugs and cementite fractures. The simulation results of wear depth were in good agreement with the test value of, with an error of 1.56%.

An Extension of CEB Elastic-Plastic Contact Model

2007 ◽  
Author(s):  
A. Sepehri ◽  
K. Farhang
Keyword(s):  
Contact Force ◽  
Tangential Force ◽  
Three Dimensional ◽  
Tangential Direction ◽  
Asperity Contact ◽  
Force Component ◽  
Normal Contact ◽  
Elastic Plastic ◽  
Force Components ◽  
Plastic Parts

Three dimensional elastic-plastic contact of two nominally flat rough surfaces is by developing the equations governing the shoulder-shoulder contact of asperities based on the Chang, Etsion and Bogy (CEB) model of contact in which volume conservation is assumed in the plastic flow regime. Shoulder-shoulder asperity contact yields a slanted contact force consisting of both tangential (parallel to mean plane) and normal components. Each force component comprises elastic and elastic-plastic parts. Statistical summation of normal force components leads to the derivation of the normal contact force for the elastic-plastic contact akin to the CEB model. Half-plane tangential force due to elastic-plastic contact is derived through the statistical summation of tangential force component along an arbitrary tangential direction.

scholarly journals The effect of sampling interval on the predictions of an asperity contact model of two-process surfaces

2017 ◽  
Vol 65 (3) ◽  
pp. 391-398 ◽  
Author(s):  
P. Pawlus ◽  
R. Reizer ◽  
M. Wieczorowski ◽  
W. Żelasko
Keyword(s):  
Surface Region ◽  
Sampling Interval ◽  
Plasticity Index ◽  
Contact Model ◽  
Asperity Contact ◽  
Normal Contact ◽  
Method Of Calculation ◽  
Surface Separation ◽  
Sampling Intervals ◽  
Flat Steel

AbstractContact of random machined two-process steel textures with a smooth, flat steel surface is discussed in this paper. Two-process surfaces were machined by vapour blasting followed by lapping. An elastic-plastic contact model was applied, assuming distributed radius of asperities. Calculation procedures allowed the mean surface separation, contact pressure, and area fraction to be computed as functions of sampling intervals. Parameters characterizing the summits important in contact mechanics were calculated for different sampling intervals. Plasticity index of two-process textures was calculated using the modified procedure. It was found that the influence of sampling interval on normal contact depended on the rough surface ability to plastic deformation. The use of a traditional method of calculation overestimated the plasticity index. Peaks from plateau surface region governed contact characteristics of two-process surfaces.

Sign in / Sign up

Export Citation Format

Share Document