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  4. 颗粒形状对复合材料单轴棘轮行为及其细观塑性变形特征的影响

复合材料学报, 2008, 25(1): 153-160. doi: 10.3321/j.issn:1000-3851.2008.01.026

颗粒形状对复合材料单轴棘轮行为及其细观塑性变形特征的影响

郭素娟 1, , 康国政 2, , 阚前华 3,

1.西南交通大学,应用力学与工程系,成都,610031

2.西南交通大学,应用力学与工程系,成都,610031

3.西南交通大学,应用力学与工程系,成都,610031

基金项目:   教育部霍英东教育基金会高等院校青年教师基金(91007)   教育部跨世纪优秀人才培养计划(NCET05-0796)   四川省青年基金(05ZQ026-028)  

关键词： 金属基复合材料 , 颗粒形状 , 棘轮行为 , 塑性变形 , 有限元方法

Effect of particle shape on uniaxial ratcheting of SiCP/6061Al composites and its microscopic plastic deformation characteristics

在细观有限元模型基础上,利用ABAQUS有限元程序对具有不同颗粒形状(球形、立方体、短棱柱和短圆柱)的SiCP/6061Al合金复合材料的单调拉伸行为和单轴棘轮行为进行数值模拟,讨论颗粒形状对复合材料棘轮行为的影响.结果表明:颗粒形状对复合材料的弹性模量、单拉行为和单轴棘轮行为均有较大影响.在所讨论的几种颗粒形状中,球形颗粒的增强效果最弱,抵抗棘轮变形的能力最差;不同短棱柱颗粒的增强效果与其拥有的棱边数有关,即五棱柱颗粒的增强效果最好,然后随棱边数的增加逐渐下降,最后接近于短圆柱形颗粒.通过有限元分析结果讨论了不同颗粒形状下基体的细观塑性变形特征及其演化规律,这些结果有助于分析该类复合材料损伤和失效机制.

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