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研究了短纤维增强复合材料(MMC)的蠕变损伤和失效的细观机理。采用微胞模型结合有限元软件ABAQUS 进行。基体的损伤失效由K-R 模型描述,纤维断裂由应力准则控制,它们已分别作为用户子程序编入到ABAQUS 中。有限元分析表明,在纤维断裂前损伤主要位于纤维头顶角附近,断裂后集中在纤维断裂面附近。纤维断裂对基体蠕变损伤影响有限,但是断面附近产生很高的应力集中,该应力集中将有助于裂纹在基体中的发展。
The mesoscopic mechanism of creep damage and failure of short fiber reinforced composites (MMCs) was studied. Mice model with finite element software ABAQUS. Damage damage to the matrix is described by the K-R model. Fiber fractures are controlled by stress criteria and have been programmed into the ABAQUS as user subroutines, respectively. Finite element analysis shows that the damage is mainly located near the top of the fiber tip before the fiber breakage, and is concentrated near the fiber fracture surface after fracture. The fiber fracture has a limited impact on the creep damage of the matrix, but high stress concentration is generated in the vicinity of the fracture. This stress concentration will help the crack growth in the matrix.