Elastic-Plastic Analysis by the Hybrid-Stress Model and the Initial-Stress Approach.

摘要

A finite-element elastic-plastic incremental procedure for the static analysis of structures whose initially-isotropic material behavior may be elastic,perfectly-plastic or strain hardening has been developed and implemented in a breadboard computer program. The formulation is based on the assumed-stress hybrid model and the initial stress included by modifying the conventional hybrid functional,resulting in a consistently derived equivalent load vector due to the initial stress. Also included in the formulation is an equivalent load term corresponding to the possible compatibility mismatch at each incremental step. The formulation and the corresponding solution procedure are evaluated using a particular plane-stress example,and convergence of the solution is shown. (Author)