Micromechanical analysis of fiber-reinforced ceramic matrix composites by a hierarchical quadrature element method
Micromechanical analysis of fiber-reinforced ceramic matrix composites by a hierarchical quadrature element method
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DOI：
10.1016/j.compstruct.2022.116143
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发表时间：
2022-08
影响因子：
6.3
通讯作者：
W. Xiang;Xin Li;Huai Ni;Bo Liu
中科院分区：
文献类型：
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作者：
W. Xiang;Xin Li;Huai Ni;Bo Liu
采用分层正交单元法对单向纤维增强陶瓷基复合材料在纵向拉伸载荷作用下的应力进行了预测。HQEM是一种近似的有限元方法，它只需要很少的采样点就可以得到高精度的结果。参数分析进行了调查的HQEM模型的界面性能的敏感性和确定最佳的界面参数的损伤CMC的细观力学分析的详细过程进行了阐述。通过与常用的基于经典剪滞模型的损伤纤维增强CMCs应力分布分析结果的比较，验证了HQEM对纤维和基体应力分布的估计。针对均布载荷下含单一基体裂纹的SiCf/SiC复合材料，分析了界面完全结合、界面脱粘和纤维破坏3种典型情况下的破坏过程，阐明了CMC破坏的特征，揭示了微观结构行为与整体破坏的关系。目前的工作提供了一个有前途的方法，高精度和高效的CMC断裂分析的扩展的基础。
This work performed stress predictions of unidirectional fiber-reinforced ceramic matrix composites (CMCs) subjected to longitudinal tension using a hierarchical quadrature element method (HQEM). The HQEM is ap-version finite element method that can present highly accurate results using only a few sampling points. Parametric analysis was conducted to investigate the sensitivity of the HQEM model to interface properties and the detailed process of determining the optimal interface parameters for micromechanical analysis of damaged CMCs has been elaborated. By comparison with the analytical results based on the classical shear-lag model which is commonly adopted to analyze the stress distributions of the damaged fiber-reinforced CMCs, the HQEM estimates of fiber and matrix stress distributions were validated. For uniformly loaded SiCf/SiC composites with a single matrix crack, the micromechanical behaviors of three typical cases during failure process, namely, interface perfectly bonded, interface debonding and fiber failure were analyzed, illustrating the characteristics of CMC failure and providing insight into the mechanisms relating the microstructural behavior to global failure. The present work offers the foundations of the extension of a promising approach for highly accurate and efficient fracture analysis of CMCs.