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该文对2D编织陶瓷基复合材料的拉伸应力-应变行为进行了试验研究和理论模拟.将2D编织结构简化为:正交铺层结构和纤维束波动结构.基于Curtin和Ahn提出的基体随机开裂、纤维随机断裂的统计分布理论,得到正交铺层结构的应力-应变关系;基于体积平均方法,将纤维束波动部分分割为若干子单元;由于纤维束的波动使各子单元材料方向与加载方向不一致,因此考虑了各子单元的线性行为和非线性行为对材料响应的影响,同时引入强度分析模型,得到纤维束波动部分的应力-应变关系.结合正交铺层部分和纤维束波动部分的应力-应变关系,得到2D编织结构的应力-应变行为,理论与试验结果吻合较好.
In this paper, the tensile stress-strain behavior of 2D braided ceramic matrix composites has been studied experimentally and theoretically simulated.The 2D braided structure is simplified as: Orthogonal layer structure and fiber bundle fluctuation structure.Based on Curtin and Ahn’s matrix random Cracking and random fracture of fiber, the stress-strain relationship of orthogonal ply structure is obtained. Based on the volume average method, the undulating part of the fiber bundle is divided into several subunits. Due to the fluctuation of the fiber bundles, Therefore, the influence of linear behavior and nonlinear behavior of each subunit on material response is considered, and the stress-strain relationship of the fluctuating part of the fiber bundle is obtained by introducing the strength analysis model. Combined with the orthogonal laying part and the fiber bundle fluctuation Part of the stress - strain relationship, get 2D woven structure of stress-strain behavior, the theory and test results agree well.