Crack Growth Behavior in Titanium Alloy Tc11 at room and high temperature

摘要

The paper presents some recent results of a rsearch program on the evaluation of the fatigue crack propagation(FCP) behavior of the titanium alloy--TC11, which is used for gas-turbine engine discs and blades. Crack propagation tests were carried out at room temperature on center cracked tension(CCT) specimens under three stress ratios R=0,0.5,-1, and at 400 degree on compact tension(CT) and single edged specimens understres ratios R=0.1 -1, respectively. The crack growth rates were compared by using stress intensity factor and effective stress intensity factor. THe results show that the effects of stress ratio and ambient temperature are decreased when the crack growth rates were correlated by using the effective stress intensity factor.