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力学与实践 ›› 2009, Vol. 31 ›› Issue (3): 39-43.doi: 10.6052/1000-0879-2008-296

• 应用研究 • 上一篇    下一篇

二维编织陶瓷基复合材料应力-应变行为

陶永强 矫桂琼 王波 常岩军   

  1. 西北工业大学力学与土木建筑学院 西安 710072
  • 收稿日期:2008-06-02 修回日期:2008-06-30 出版日期:2009-06-08 发布日期:2009-06-08

STRESS-STRAIN BEHAVIOR IN 2D WEAVE CERAMIC MATRIX COMPOSITE

  • Received:2008-06-02 Revised:2008-06-30 Online:2009-06-08 Published:2009-06-08

摘要: 对二维编织陶瓷基复合材料拉伸应力-应变行为进行了试验研究和理论模拟. 将二维 编织结构简化为:正交铺层结构和纤维束波动结构. 基于基体随机开裂、纤维随机断裂分布 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,将纤维束波动部分进行分割, 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,得到二维编织结构的应力-应变行为,理论与试验吻合较好.

关键词: 陶瓷基复合材料,应力-应变,纤维束波动,强度分析模型,正交铺层

Abstract: stress-strain behavior of 2D weave ceramic matrix composite is studied by experimental and theoretical methods. The 2D weave structure is simplified as a crossply structure and a fiber bundle undulation structure. Based on the matrix strength stochastic distribution theory and the fiber failure stochastic distribution theory, the stress-strain behavior and the tangent tensile modulus are obtained for unidirectional composite (0$^\circ$ ply). With the relationship between crossply and unidirectional ceramic matrix composite with the same material, the stress-strain behavior of crossply ceramic matrix composite can be obtained. A two-dimensional analytical method is proposed for fiber bundle undulation structure. With the composite strength model, the undulation structure is divided into sub-elements. The failure analysis is carried out considering the failure of different sub-elements in the fiber bundle undulation structure. Moreover, the stress-strain behavior of the undulation structure is obtained. Combining the crossply and the undulation structure's stress-strain behavior, the stress-strain behavior of of the 2D weave ceramic matrix composite is obtained; and the result agrees well with the experimental result.

Key words: ceramic matrix composite, 2D, fiber bundle undulation, strength model