Experimental Support for Generalized Equation Predicting Low Cycle Fatigue

Abstract

Experimental data from cyclic strain fatigue tests on twelve structural materials are compared on the basis of a low cycle fatigue equation as suggested by an ASME task group. This equation S=Ec2N1/2+Se where Se is the endurance limit, E the modulus of elasticity, N the cycles to failure, and c a constant derived from reported values of reduction in area, gives the stress amplitude S for comparison with elastically computed stresses. A satisfactory or good correlation with experiments for up to 105 cycles of failure is found.