The study focuses on characterizing the thermo-mechanical properties of SiC_f/SiC using micromechanics finite element method (FEM) and multi-scale thermal–mechanical coupling asymptotic homogenization methods. A multi-scale model of fiber, fiber bundle and 2D woven SiC_f/SiC has been established, while the predicted properties of the model are verified with the relevant experiments. The detailed steps to realize the micromechanical FEM are discussed, and the improvement methods have been put forward. To provide an optimal process of the micromechanical FEM based on the general software, different boundary and post-processing conditions are used and compared. Based on the traditional homogenization theory, the multi-scale thermal–mechanical coupling asymptotic homogenization method has also been developed to predict the thermo-mechanical properties of the RVE model with introduced realization. To verify the theoretical method, the properties of the 2D woven SiC_f/SiC were predicted using micromechanics FEM and multi-scale thermal–mechanical coupling method, and the experimental analysis was carried out to compare with the predict results. The two methods exhibit errors in predicting the inter-layer directional performance, while the performance in other directions varies only slightly. The error between the most of the predicted values and experimental measurements is approximately 11%.

该研究致力于利用微力学有限元方法（FEM）和多尺度热力耦合渐近均匀化方法来表征SiC _f / SiC的热机械性能。纤维，纤维束和二维编织SiC _f的多尺度模型已经建立了/ SiC，同时通过相关实验验证了模型的预测特性。讨论了实现微机械有限元的详细步骤，并提出了改进方法。为了基于通用软件提供最佳的微机械有限元程序，使用并比较了不同的边界条件和后处理条件。在传统均质化理论的基础上，还引入了多尺度热力耦合渐近均质化方法，以预测RVE模型的热力学性质。为了验证理论方法，二维编织SiC _f的性能用微力学有限元法和多尺度热力耦合方法对SiC / SiC进行了预测，并进行了实验分析，与预测结果进行了比较。两种方法在预测层间方向性能时均显示错误，而其他方向的性能仅略有变化。大多数预测值和实验测量值之间的误差约为11％。