A model for fatigue crack propagation during high cycle fatigue

Abstract

This paper deals with the prediction of high-cycle fatigue behaviour for four different materials (a 7075-T6 alloy, a Ti-6Al-4V alloy, JIS S10C steel and a 0.4%C steel) using Chapetti´s approach to estimate the fatigue-crack propagation curve. In the first part of the paper, a single integral equation for studying the entire propagation process is determined using the recent results of Santus and Taylor, which consider a double regime of propagation (short and long cracks) characterized by the model of El Haddad. The paper?s second part includes a comparison of the crack propagation behaviour model proposed by Navarro and de Los Rios with that advanced in the first half of this work. The results allow us to conclude that the approach presented in this paper is a good and valid estimation of high-cycle fatigue-crack propagation using a single equation to describe the entire fatigue-crack regime.