Equivalent K_t Method for Evaluating Fatigue Properties of Titanium Alloy Welding Specimens

With regard to the Titanium alloy welding structures generally used in advanced aircraft structures,an equivalent theoretical stress concentration coefficient Kt (K_te) was introduced to describe the fatigue property of welding specimen. On the basis of the fatigue properties of Titanium alloy specimens,a technological approach used to determine K_te is established through fatigue testing for the Titanium alloy welding specimen under a spectrum load. The detailed process determining K_te and some useful results are given by taking the TC4 titanium alloy oxy-arc welding specimen for example.