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

Abstract

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.

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

“…To formulate the wear problem, it is necessary to consider the load-deformation analysis in elastic, elastic-plastic, and plastic zones of deformation. As in earlier study (Waghmare & Sahoo, 2014b), to model the contact load in presence of adhesion in -elastic, elastic-plastic, and plastic state of deformation, Johnson et al (1971) (hence forth called as JKR), KE (2013), and Roy Chowdhury and Pollock (1981) theories are used respectively. The normalized applied load on a single n-point asperity in elastic given by (Waghmare & Sahoo, 2014b).…”

“…So use of this model is expected to yield comparatively more accurate results of analysis. Based on this new n-point asperity model, the rough surface contact problems for various contact conditions have been considered earlier (Hariri et al, 2006b;Sahoo et al, 2009;Waghmare & Sahoo, 2014a;2014b;2015a;in press). Novelty of the present work is -it incorporates wear contribution from all zones of asperity contact deformation; and it analyses the contact situation for wear in more realistic way of modeling, i.e.…”