Fatigue strength assessment of beams under variable combined random stress

Abstract

The paper deals with high-cycle fatigue of the beams subjected to variable combined load consisting of bending moment, torsional moment and axial force. It is assumed that the envisaged service life can be considered as a set of states and that the stress components in each state are stationary random processes of known power spectral densities. An equivalent state of stress is determined which makes formulating the fatigue criteria possible.