Elastic-Plastic Analysis of Thin Sheets with Pressurized Circular Holes

Abstract

Using the numerical boundary integral equation (BIE) method for two-dimensional elasto-plasticity based on the quadratic isoparametric formulation, solutions for the deformations and stresses in two 2024-T81 aluminum sheets with pressurized circular holes are obtained. Results are presented showing the plastic zone developments in these structures, the variations of the stresses when subjected to the applied radial pressures at the hole peripheries, as well as the residual stress distributions when the loads are completely removed. Where appropriate, the computed solutions are compared with those obtained analytically for a similar problem.