中文摘要：

基于纤维增强复合材料的热/机械疲劳损伤机理,考虑纤维强度的统计特性和金属基体循环响应的特征,发展了纤维断裂、基体和界面局部循环塑性以及基体/纤维脱粘等细观模式控制的疲劳破坏分析模型,结合Monte-Carlo方法研究了复合材料在循环载荷作用下的渐进破坏过程和疲劳行为,将纤维的统计强度、基体热塑性以及界面特性与复合材料的疲劳寿命定量地联系起来。

英文摘要：

In this paper, a micromechanically analytical model based upon progressive damage mechanisms under cyclical thermomechanical loading, by considering statistical particularity of fiber strength and cyclic response of matrix properties,is developed to investigate fatigue failure of continuous fiber-reinforced metal matrix composites, which is dominated by multiple damage events described by fiber fracture, local cyclic plasticity of matrix and interface,as well as interfacial debonding.A simulation scheme coupled with Monte-Carlo method was executed to simulate progressive failure process and fatigue behavior of the composites under cyclic loads.The results show that the curve of fatigue life is quantitatively related to the statistic variations in fiber strength, local thermo-plasticity of matrix properties and interface characters between fiber and matrix.