Fatigue Strength of Metals under Alternating Stresses of Varying Amplitude

Abstract

The criterion on fatigue damage and the formulas which can predict the fatigue lives and fatigue limits of metallic members under alternating stresses of varying amplitude, are established. The fatigue tests under alternating stresses of varying amplitude were carried out by the specially designed testing machines of three types, using unnotched or notched specimens of low-carbon steel, high-carbon steel and duralumin. And it is concluded that the fatigue lives and fatigue limits of metals subjected to varying repeated stresses like this can be determined by the analysis introduced in this paper.