Effect of Strain Hardening on Elastic-Plastic Contact of a Deformable Sphere against a Rigid Flat under Full Stick Contact Condition

Biplab Chatterjee,Prasanta Sahoo

doi:10.1155/2012/472794

Abstract

The present study considers the effect of strain hardening on elastic-plastic contact of a deformable sphere with a rigid flat under full stick contact condition using commercial finite element software ANSYS. Different values of tangent modulus are considered to study the effect of strain hardening. It is found that under a full stick contact condition, strain hardening greatly influences the contact parameters. Comparison has also been made between perfect slip and full stick contact conditions. It is observed that the contact conditions have negligible effect on contact parameters. Studies on isotropic and kinematic hardening models reveal that the material with isotropic hardening has the higher load carrying capacity than that of kinematic hardening particularly for higher strain hardening.

Highlights

Surface interactions are dependent on the contacting materials and the shape of the contacting surfaces
Researchers have attempted to investigate the effect of material properties beyond the Hertz restriction and the elastic plastic contact of a sphere with a flat became a fundamental problem in contact mechanics
The effect of strain hardening on contact parameters under the full stick contact condition for both the isotropic and kinematic hardening models is investigated

Summary

Introduction

Surface interactions are dependent on the contacting materials and the shape of the contacting surfaces. Kogut and Etsion [21] (KE Model) first provided an accurate result of elastic-plastic contact of a hemisphere and a rigid flat using commercial finite element software ANSYS to study the plastic zone under frictionless contact condition They considered a wide range of material properties and sphere size and provided generalized empirical relations for contact area and contact force in terms of dimensionless contact interference for elastic, elastic-plastic, and fully plastic region. Brizmer et al [32] extended their study for the loading of an elastic plastic spherical contact both under full stick and perfect slip contact conditions They found that the interfacial parameters are insensitive to the contact condition and material properties of the deformable sphere. Present investigation attempts to study the effect of strain hardening on contact parameters for full stick contact condition

Theoretical Background

Finite Element Model

Results and Discussion

Elements

Conclusion