This manuscript presents the formulation, implementation, calibration and application of a multiscale reduced-order model to simulate a titanium panel structure subjected to thermo-mechanical loading associated with high-speed flight. The formulation is based on the eigenstrain-based reduced-order homogenization model (EHM) and further considers thermal strain as well as temperature dependent material properties and evolution laws. The material microstructure (i.e., at the scale of a polycrystalline representative volume element (RVE)) and underlying microstructural mechanisms are directly incorporated and fully coupled with a structural analysis, allowing concurrently probing the response at the structural scale and the material microscale. The proposed approach was fully calibrated using a series of uniaxial tension tests of Ti-6242S at a wide range of temperatures and two different strain rates. The calibrated model is then adopted to study the response of a generic aircraft skin panel subjected to thermo-mechanical loading associated with high-speed flight. The analysis focuses on demonstrating the capability of the model to predict not only the structural scale response, but simultaneously the microscale response, and further studies the effects of temperature and texture on the response.

中文翻译：

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受热机械载荷影响的钛蒙皮板的多尺度降阶建模

本手稿介绍了多尺度降阶模型的制定、实施、校准和应用，以模拟承受与高速飞行相关的热机械载荷的钛板结构。该公式基于基于特征应变的降阶均质化模型 (EHM)，并进一步考虑了热应变以及与温度相关的材料特性和演化规律。材料微观结构（即在多晶代表性体积元素 (RVE) 的尺度上）和潜在的微观结构机制直接结合并与结构分析完全耦合，允许同时探测结构尺度和材料微观尺度的响应。使用 Ti-6242S 的一系列单轴拉伸试验在很宽的温度范围和两种不同的应变率下对所提出的方法进行了完全校准。然后采用校准模型来研究通用飞机蒙皮面板在与高速飞行相关的热机械载荷下的响应。分析的重点是证明模型不仅可以预测结构尺度响应，还可以同时预测微尺度响应，并进一步研究温度和纹理对响应的影响。