Assessment of the Existing Models to Estimate the Fatigue Life under Both Multiaxial in Phase and 90° Out of Phase Loading Conditions

The objective of this paper is to evaluate the validity of commonly usedmultiaxial fatigue criteria for different multiaxial loading conditions. the bestcriterion is identified through comparative analysis. the assessment is basedon the experimental research findings of the sae notched shaft, which is usedas a benchmark. the relative performance of the three existing multiaxialfatigue theories based on the strain criteria and the critical plane approachesare investigated. there is no fixed strain life criterion that can predict thefatigue life best for different loading cases. among all the critical plane modelsconsidered, fatemi and socie model gives best fatigue life prediction for bothmultiaxial in phase and 90° out of phase loading cases.