Contact around a Sharp Corner with Small Scale Plasticity

Zupan Hu

doi:10.11648/j.am.s.2017060101.12

Abstract

Owing to elastic singularity, the contact stress around a sharp corner is highly sensitive to the boundary conditions and local geometrical details. Determination of such stress is critical in predicting failures such as wear, fretting fatigue and crack initiation. In this paper, the stress around such corner is analyzed based on linear elasticity and small scale plasticity. The stress on the contact interface is generalized in a way that the results can be easily converted to represent another corner with different dimensions or boundary conditions. An example is presented to show the determination of the stress scale and the formulation of a generalized solution. It is shown that the generalized macro stress field away from the corner dominates the contact behaviors around the corner.

Highlights

The stress field around a contact interface with a sharp corner is closely related to various failures such as wear, fatigue and plastic yielding, which significantly limit the life of various engineering components [1,2,3,4,5,6,7,8,9,10,11,12,13,14]
The goal of this paper is to investigate the effects of slip and small scale plasticity on the stress field on contacting surfaces, with a particular emphasis on the behavior at corners
The slip behaviors around a sharp corner is highly sensitive to the specific loading condition, corner angle, dimensions and local yielding

Summary

Introduction

The stress field around a contact interface with a sharp corner is closely related to various failures such as wear, fatigue and plastic yielding, which significantly limit the life of various engineering components [1,2,3,4,5,6,7,8,9,10,11,12,13,14]. The damage is determined by the energy dissipation process in the slip regions [22, 25]. Such identification is crucial for predicting the life of many engineering components. Studies have shown that crack growth is accelerated greatly at the boundary between the slip and stick zones, reducing the fatigue life significantly [25,26,27,28,29,30,31,32]

Objectives

Methods

Results

Conclusion