Modelling Elasto-Plastic Material Behaviour for Multiaxial Fatigue Life Predictions: Comparisons and Results

摘要

A comparison between incremental plasticity models for the calculation of the stress-strain inelastic stabilised response of a material subject to complex loading is presented. The stress-strain response, calculated with three different algorithms, has been compared with measured responses from strain-controlled tests on normalised SAE 1045 steel thin-walled tubular specimens. The comparison, extended on a variety of non-proportional load paths, is used to estimate the influence of the plasticity models and the hardening rules. All the plasticity models presented in this paper are in qualitative agreement with the experimental results for all loading cases. The two-surface model with Mroz hardening rule, being also in good quantitative agreement with experimental results, is suggested as the most suitable one for multiaxial fatigue life prediction.