Elastic-Plastic and Residual Stress Analysis of a Thermoplastic Composite Hollow Disc under Internal Pressures

Abstract

This article deals with the elastic-plastic stress analysis of a thin thermoplastic composite disc under internal pressures. An analytical solution is performed for satisfying elastic-plastic stress-strain relations and boundary conditions for small plastic deformations. Because of the material properties, the composite disc is assumed to be elastic-perfectly plastic, and the Tsai-Hill Criterion is used as a yield criterion. Elastic-plastic and residual stress distributions are obtained from the inner radius to the outer radius, and they are presented in tables and figures. All radial stresses r are compressive, and they are highest at the point where the plastic deformation begins. All tangential stresses are tensile, and they are highest at the inner radius. The magnitude of tangential residual stresses is higher than that of the radial residual stresses, and it changes nonlinearly from the inner radius to the outer radius.