Lifetime Assessment for a Cracked Compressor Disk Based on the Plastic Stress Intensity Factor

Based on a new fracture mechanics parameter, this study is concerned with assessment of the lifetime of a cracked aircraft gas turbine engine compressor disk operating under low cyclic loading conditions. In combination with the elastic-plastic properties of the VT3-1 titanium alloy, various combinations of angular velocity, temperature, surface flaw form and size are considered. A lifetime prediction model, which is based on the fracture process zone size and plastic stress intensity factor (SIF), is proposed. The durability of the compressor disk is predicted on the basis of SIF distributions obtained from elastic and plastic crack growth models. © 2020, Allerton Press, Inc.