Citation
Raj Arora, Prithvi and Tan, Jeffrey Meng Lee and Barnard, Christian and Asrar, Waqar
Finite element analysis of residual stresses during cold working.
In: Persidangan Kebangsaan Penyelidikan & Pembangunan IPTA 2001 (25-26 Oktober 2001) hosted in Universiti Kebangsaan Malaysia, Bangi, Selangor, 25-26 Oktober 2001, Universiti Kebangsaan Malaysia, Bangi, Selangor. .
Abstract
A two-dimensional finite element (FE) analysis, under plane stress condition has been carried
using 2024-T3S1 aluminium alloy plate 6.35 mm thick with 6 mm diameter hole to study the cold
expansion process. 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 at the hole edge with reversed yielding on unloading. Reverse yielding was
observed ifthe pressure loading P//oy > 1.2 attributed to the exceeding of raised compressive yield
stress during unloading. A linear relationship has been observed between the cold work and the
applied ND-pressure till a ND-pressure of 1.2 for the loading case and unloading case. A
polynomial 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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