Model for fatigue life estimation under multiaxial random loading and its verification based on fatigue tests results

The paper presents the procedure for fatigue life estimation, which can be applied for complex service loading of structural elements. Four multiaxial criteria and method of variance for critical plane determination are described. On the basis of fatigue tests for cylindrical specimens made of aluminum alloy PA6 under constant amplitude and random axial with torsional loading, the results of comparison calculated and experimental fatigue lives are presented. The criterion of maximum combination of normal and shear stresses on the critical plane gave the best results.