2D编织陶瓷基复合材料应力-应变行为的试验研究和模拟  

EXPERIMENTAL INVESTIGATION AND NUMERICAL SIMULATION OF THE STRESS-STRAIN BEHAVIOR OF 2D WEAVE CERAMIC MATRIZ COMPOSITES

作　　者：陶永强[1] 矫桂琼[1] 王波[1] 杨成鹏[1] 

机构地区：[1]西北工业大学力学与土木建筑学院,西安710129

出　　处：《固体力学学报》2010年第3期258-268,共11页Chinese Journal of Solid Mechanics

基　　金：自然科学基金(90405015);高等学校博士学科点专项科研基金(20030699040)资助.

摘　　要：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.Stress-strain behavior of 2D weave ceramic matrix composites is studied both experimentally and analytically,while 2D weave structures are simplified as crossply structures and fiber bundle undulation structures;Based on the distribution theory of matrix stochastic cracking and fiber stochastic failure,stress-strain behavior and tangent tensile modulus related to applied load of unidirectional composite（0°ply） are obtained.Using the relationship between crossply and unidirectional ceramic matrix composite stress-strain behavior,one can readily obtain the stress-strain behavior of crossply ceramic matrix composite.A two-dimensional analytical method is presented for fiber bundle undulation structure.Through the composite strength model,the undulation structure is divided into a series of sub-elements.The failure analysis is carried out considering the failure of different sub-elements in fiber bundle undulation structure.Moreover,stress-strain behavior of undulation structure is obtained.Integrating the stress-strain behavior of crossply and undulation structure as a whole,the stress-strain behavior of 2D weave ceramic matrix composites is gained,well agreed between the theoretical prediction with the experimental results.

关 键 词：2D 陶瓷基复合材料 纤维束波动 强度分析模型 线性 非线性 细观力学 

分 类 号：TB332[一般工业技术—材料科学与工程]