采用多颗粒三维单胞模型和复合材料细观有限元分析方法,借助先进循环黏塑性本构模型的有限元实现,对SiC颗粒增强6061Al复合材料的室温、高温时间相关单轴棘轮行为进行数值模拟.讨论了颗粒排列方式和界面结合状态的变化对复合材料棘轮行为的影响;同时,分析了复合材料中基体和界面的微观变形特征及其演变规律;最后,选取一组合理的微结构参数,对复合材料的时间相关棘轮行为进行了数值模拟,并通过与已有实验结果的比较,检验了有限元分析的合理性.结果表明:多颗粒代表性体积单元能够反映复合材料更多的微观细节;颗粒排列方式的变化显著影响复合材料的整体棘轮行为;界面结合状态越好,产生的棘轮变形越小;具有合理参数值的弱界面模型给出的时间相关棘轮变形预测结果比完好界面模型的结果更接近实验值.
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