Limiting State Models for Structural Materials Under Symmetrical Cyclic Bending-Torsional Loading

Abstract

Accurate and approximate alternatives of limiting state models for isotropic metallic materials under symmetrical cyclic bending-torsional loading are proposed. In the accurate models, the relation between the peak amplitudes of normal and tangential stresses is preset with exponential transcendental functions. The approximate alternatives were obtained from the accurate models by series expansion of transcendental functions reduced to two and three terms. The models were experimentally verified with limiting state calculation problems for solid cylindrical and thinwalled tubular specimens. The proposed models are compared with classical fracture criteria-based ones.