冲击剪切载荷下SiC_P/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 SiC_P/6151Al COMPOSITES UNDER IMPULSIVE SHEAR LOADINGS

作　　者：刘龙飞[1] 戴兰宏[1] 凌中[1] 杨国伟[2] 

机构地区：[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 [2]湘潭大学物理系,湘潭411105

出　　处：《复合材料学报》2002年第4期51-55,共5页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金 (1990 2 0 17);中科院重大项目 (KJ-95 1-1-2 0 1)

摘　　要：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 (Si CP/ 6 15 1Al)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 )The effects of the reinforcing particle size and strain rate on the deformation localization behavior of SiCp/6151Al composites are investigated by making use of Split Hopkinson bar and MTS-810 materials testing system with specially-designed hat-shaped specimens, which can produce a shear loading in the specimen. The experimental results demonstrate that the strengthening effect for the small-size particle-reinforced composite is higher than that for the large-size particle-reinforced composite. However, the small-size particle-reinforced composite is more prone to the deformation localization than the large-size particle reinforced composite under the impact loading. The mechanisms leading to the deformation localization in particle reinforced metal matrix composites are discussed in this paper as well.

关 键 词：冲击剪切载荷 SiCp/6151Al复合材料 增强颗粒 尺寸效应 变形局部化 碳化硅 铝 

分 类 号：TB333[一般工业技术—材料科学与工程]