Application of biaxial plasticity and damage modelling to the life prediction and testing of automotive components

摘要

A method has been developed for making life predictions for engineering components subject to multiaxial loadings using the local strain approach.the method has been incorporated into a computer program,which uses a Mroz-Garud (1,2) cyclic plasticity model and the Wang-Brown cycle counting and damage models (3,4).The plasticity,rainflow cycle counting and damage models have been generalised to deal with any free-surface loading conditions.The program makes calculations based on strain gauge rosette measurements and its application is illustrated by calculations from three typical automotive components.Some interesting methods for visualising the analysis results are explored.In addition to life prediction,the approach also has applications in accelerated durability testing.