Abstract
A crystal plasticity model is developed to understand the fatigue behavior of Ti-6Al-4V under in-phase (IP) and out-of-phase (OP) thermo-mechanical loading. A systematic calibration and validation strategy using experimental data of isothermal monotonic and fatigue is developed to parameterize the model. Subsequently, crystal plasticity finite element method simulations under IP and OP thermo-mechanical fatigue loads are performed. A comparison of the stress range and hysteresis with cycles, between the IP and OP cases, shows that the proposed model is able to capture their differences appropriately. The stress distribution in the microstructure also clearly explains the larger life under IP as compared to OP as observed in experiments.
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