Numerical Simulation of Low Cycle Fatigue Behavior of Ti2AlNb Alloy Subcomponents

Abstract

Many titanium alloy subcomponents are subjected to fatigue loading in aerospace engineering, resulting in fatigue failure. The fatigue behavior of Ti 2 AlNb alloy subcomponents was investigated based on the Seeger fatigue life theory and the improved Lemaitre damage evolution theory. Firstly, the finite element models of the standard openhole specimen and Y-section subcomponents have been established by ABAQUS. The damage model parameters were determined by fatigue tests, and the reliability of fatigue life simulation results of the Ti 2 AlNb alloy standard open-hole specimen was verified. Meanwhile, the fatigue life of Ti 2 AlNb alloy Y-section subcomponents was predicted. Under the same initial conditions, the average error of fatigue life predicted by two different models was 20.6%. Finally, the effects of loading amplitude, temperature, and Y-interface angle on fatigue properties of Ti 2 AlNb Y-section subcomponents were investigated. These results provide a new idea for evaluating the fatigue life of various Ti 2 AlNb alloy subcomponents.