An energy‐based approach for uniaxial fatigue life estimation under asymmetric cyclic loading

Abstract

Energy parameter formed by multiplying the maximum strain range and the peak stress has the problem that one value may correspond to multiple fatigue damage states. For this issue, a new energy parameter suitable for tensioncompression is proposed, which includes an improved strain-energy model and a strain-energy ratio. The improved strain-energy model deduced by judging the volume change of the micro-element has positive and negative function which can use to distinguish tensile and compressive deformation. The strainenergy ratio is established to characterize the alternate tensile and compressive deformation under asymmetric cyclic loading. Then, applying fatigue test data,