摘要
采用粘结带模型描述复合材料界面的分离特性,利用有限元数值方法模拟了陶瓷基复合材料的纤维拔出的细观损伤和破坏过程,计算了其拔出过程的载荷-位移响应曲线,研究了界面结合强度、纤维的埋深长度以及热膨胀不匹配对纤维拔出过程的影响。结果表明该模型能很好的解释纤维拔出的破坏过程,纤维的最大拔出力和材料的承载能力都随面结合强度、纤维的埋入长度和基体的热膨胀系数增大而增大;纤维与基体热膨胀系数的不匹配对摩擦拔出力有直接影响。
The separation characteristics of composite interface were described by adopting cohesive zone model. The meso-demage and fracture process of fiber pullout of the ceramic matrix composites were stimulated by means of finite element numerical method and the load displacement curve of the pullout process were also calculated. The effects of the interfacial bond strength, the embedded length of fiber and the thermal expansion coefficient on the fiber pullout process were studied. The results showed that the model could explain the fracture process of fiber pullout well. The maximal pullout force and the load carrying capacity increased with the above factors increasing The disagreement between fiber and thermal expansion coefficient affect the pullout force directly.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第A01期766-769,共4页
Rare Metal Materials and Engineering
关键词
陶瓷基复合材料
单纤维拔出
有限元
粘结带模型
ceramic matrix composites
finite element methods
fiber pullout
cohesive zone models
