Accession Number : AD0772933

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

Descriptive Note : Interim rept.,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE AEROELASTIC AND STRUCTURES RESEARCH LAB

Personal Author(s) : Spilker,Robert L.

Report Date : SEP 1973

Pagination or Media Count : 107

Abstract : SITE MATERIALS, Structures, Fibers, Mathematical models, Stresses, Stress strain relations, Static loadsFinite element analysisA 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)

Descriptors :   *Elastic properties, *Plastic properties, *Composite materials, Structures, Fibers, Mathematical models, Stresses, Stress strain relations, Static loads

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE