Effect of Creep-Fatigue Loading Condition on Crack Tip Fields of Grade 91 Steel at Crack Initiation and Growth

Abstract

In this paper, the effect of creep-fatigue loading condition on crack tip deformation and stress fields of Grade 91 steel at 600 o C at crack initiation and growth is studied. By using finite element debond analysis method, creep-fatigue crack growth tests using C(T) specimens under various load ratios and hold times are simulated, and the effect of creep-fatigue load ratio and hold time on the plastic zone, creep zone, crack opening profile, equivalent stress, crack-opening stress and triaxiality at crack initiation and growth is presented. It is found