Fatigue Life Prediction in Selective Laser Melted Samples Under Variable Amplitude Loading Based on Two Constant-Amplitude Tests

Abstract

This paper addresses the fatigue behaviour of selective laser melted samples subjected to variable amplitude loading. In a first stage, a series of low-cycle fatigue tests is performed to identify an energy damage parameter able to correlate the load history with the fatigue lifetime. In a second stage, an energy-life curve is established on the basis of two tests performed under pulsating loading conditions. Finally, fatigue lifetime of samples tested at variable-amplitude loading are successfully predicted using the energy-life curve previously established along with an adequate fatigue damage accumulation law.