Elastic-Plastic Finite-Difference Analysis of Unidirectional Composites Subjectedto Thermomechanical Cyclic Loading

摘要

An analytical tool was developed to model a unidirectional composite subjected tothermomechanical cyclic loading and processing conditions. The finite difference method was incorporated into a PC compatible computer code, FIDEP (Finite-Difference Code for Elastic-Plastic Analysis of Composites). FIDEP provides an efficient numerical procedure for analyzing a variety of problems involving thermal and mechanical cycling. The procedure allows the modeling of the constituent materials as elastic-plastic with temperature dependent properties. The concentric cylinder approximation allows the computations to capture the three-dimensional aspects of the stress state in a real composite. Results for a thermal cool-down in an SCS-6/Ti-24A1-11Nb unidirectional composite compare well with those obtained using the finite element method. Several problems were solved for thermomechanical loading conditions and demonstrate the three-dimensional nature of the stress fields in the matrix material. Concentric cylinder model, Elastic plastic, Finite difference methods, Metal matrix composite, Thermomechanical fatigue, Unidirectional composite.