A Low Cycle Fatigue Damage Accumulation Approach Based On Energy Criterion And Its Verification For Polyvinyl Chloride Polymer

A new approach of low-cycle fatigue damage accumulation based on an applied energy criterion of the fatigue process is proposed. However, taken for granted is that the proportion of two or further successive stress levels are used to explain the phenomenon on damage expansion. This approach is introduced into a nonlinear fatigue model whose purpose is to predict the fatigue life under variable loading. Experimental data from polymer material as polyvinyl chloride are utilized to verify the effectuality of the proposed approach. It is found that the proposed approach shows a good estimation and its damage curve presents a characteristic nonlinear behaviour of damage growth.