Residual Fatigue Life Evaluation of the Engine Crank Shaft Based on the Cumulative Fatigue Damage Theory

With the cumulative fatigue damage theory, the residual fatigue life assessment model of crankshaft was built and its residual life was evaluated based on the history statistical working conditions. First, the three-dimension solid model of the crankshaft was formed by Pro/E software, and then imported into finite element analysis software ANSYS to perform dynamic response calculation under typical working conditions, the high stress area of structure, namely that of the most severe cumulative fatigue damage, was obtained. Then the stress-time history was carried out rain-flow counting by the finite element analysis, and the fatigue load spectrum was established based on history statistics record. The fatigue residual life assessment model was built with nominal stress approach and one application example was given at last.