FINITE ELEMENT ANALYSIS OF RESIDUAL STRESSES DURING COLD WORKING
Keywords:
Cold work. residual stress, elastic-plastic boundary, reverse yielding, finite element analysis. aluminium alloy.Abstract
A two-dimensional finite dement (FE) analysis. under plane stress condition has been carried out usng 2024-T351 aluminium alloy plate 6.35 mm thick with 6 mm diameter hole subjected to internal pressure. The material for the analysis is assumed to be isotropic, and a von Mises
failure criterion along with linear isotropic hardening is used. The residual stress distribution has
been obtained with pressure loading. The results indicate that large compressive tangential
residual stresses were induced al the hole edge. Reverse yielding was observed for the pressure
loading PI a, > 1.2. A linear relationship has been observed between the applied ND-pressure
and the anticipated equivalent cold work till a ND-pressure of 1.2. A polynominl relationship is
obtained giving the estimate of elastic-plastic boundary for a specified value of ND-pressure at
the hole periphery.
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