SEDL / STP / STP1191-EB / STP24794S

Multiaxial Stress-Strain Modeling and Fatigue Life Prediction of SAE Axle Shafts

Chu, C-C
Research staff, Ford Motor Company, Scientific Research Laboratories, Dearborn, MI

Conle, FA
Research staff, Ford Motor Company, Scientific Research Laboratories, Dearborn, MI

Bonnen, JJF
Research staff, Ford Motor Company, Scientific Research Laboratories, Dearborn, MI

Pages: 18    Published: Jan 1993

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Abstract

A three-dimensional stress-strain model with an isotropic-kinematic hardening rule has been successfully applied to obtain estimated stress histories from the rosette strain histories. The strains are measured on surface elements near the notch root of SAE axle shafts subjected to variable-amplitude multiaxial service loading conditions. The critical plane approach is adopted to predict fatigue lives by examining the detailed stress and strain states on all potential critical planes of an element. Several commonly used damage criteria as well as a work-based criterion proposed here are evaluated by comparing the predicted and experimentally observed fatigue lives for a wide range of tests. The encouraging results demonstrate the current model's capability of simulating complex tests and predicting fatigue lives.