Investigation of strain rate on residual stress distribution

Abstract

Residual stresses are induced in the material during various manufacturing practices and thus significantly affect the life span of manufactured objects. Most of the manufacturing processes involve metal working or deformation at some stage, which leads to the development of residual stresses. Hence, it is essential to understand the effect of metal deformation parameters on the residual stress distribution as it has vital design implications. This study attempts to investigate the effect of deformation rate on the residual stress distribution in a ductile material such as copper. The nanoindentation technique has been employed to examine the residual stresses. Copper bars are deformed in tension at different strain rates and residual stress distribution is estimated along the span of deformed bars. The experimental outcomes had shown an overall increase in residual stresses with increase in strain rate, whereas, the uniform distribution of residual stresses was observed at a higher strain rate. This study contributes in the elucidation and optimization of residual stresses based on the manufacturing record as residual stress is a serious complication in superior material fabrication and practices.