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.

中文翻译：

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热机械疲劳下钛合金的晶体塑性建模

摘要 开发晶体塑性模型以了解 Ti-6Al-4V 在同相 (IP) 和异相 (OP) 热机械载荷下的疲劳行为。开发了使用等温单调和疲劳实验数据的系统校准和验证策略来参数化模型。随后，进行了 IP 和 OP 热机械疲劳载荷下的晶体塑性有限元方法模拟。IP 和 OP 情况下的应力范围和滞后与周期的比较表明，所提出的模型能够适当地捕捉它们的差异。微观结构中的应力分布也清楚地解释了与实验中观察到的 OP 相比，IP 下的寿命更长。