冲击剪切载荷下SiCP/6151Al复合材料变形局部化及增强颗粒尺寸效应

复合材料学报, 2002, 19(4): 51-55. doi: 10.3321/j.issn:1000-3851.2002.04.012

冲击剪切载荷下SiCP/6151Al复合材料变形局部化及增强颗粒尺寸效应

刘龙飞 ^1, , 戴兰宏 ^2, , 凌中 ^3, , 杨国伟 ^4,

1.中国科学院,力学研究所,非线性力学国家重点实验室,LNM,北京,100080;湘潭大学物理系,湘潭,411105

2.中国科学院,力学研究所,非线性力学国家重点实验室,LNM,北京,100080

3.中国科学院,力学研究所,非线性力学国家重点实验室,LNM,北京,100080

4.湘潭大学物理系,湘潭,411105

基金项目: 中国科学院资助项目(KJ-951-1-201) 国家自然科学基金(19902017)

关键词：冲击 , 金属基复合材料 , 变形局部化 , 尺寸效应

LOCALIZED DEFORMATION AND PARTICLE SIZE-EFFECT IN PARTICLE-REINFORCED SiCP/6151Al COMPOSITES UNDER IMPULSIVE SHEAR LOADINGS

利用特殊设计的"hat shape"试样,在分离式Hopkinson压杆和MTS通用材料试验机上实验研究了颗粒尺寸和应变率对颗粒增强金属基复合材料(SiCP/6151Al)变形局部化行为的影响.结果表明:颗粒尺寸对复合材料的变形强化与变形局部化行为有显著影响.具体表现为:颗粒越小,复合材料流动应力越高,即强化效果越好;另一方面,对受载试样的微观检测发现,颗粒越小,复合材料剪切变形局部化越明显.同时发现,冲击载荷(高应变率)下复合材料更容易发生变形局部化.

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冲击剪切载荷下SiCP/6151Al复合材料变形局部化及增强颗粒尺寸效应

LOCALIZED DEFORMATION AND PARTICLE SIZE-EFFECT IN PARTICLE-REINFORCED SiCP/6151Al COMPOSITES UNDER IMPULSIVE SHEAR LOADINGS

参考文献