冲击剪切载荷下SiC<sub>P</sub>/6151Al复合材料变形局部化及增强颗粒尺寸效应

刘龙飞; 戴兰宏; 凌中; 杨国伟

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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

1.
;
2.
湘潭大学物理系,湘潭 411105

基金项目: (国家自然科学基金(19902017)及中科院重大项目(KJ-951-1-201)

详细信息

作者简介:
刘龙飞(1975),男,硕士研究生,主要从事材料动态力学性能方面的研究。

中图分类号: TB331
计量
- 文章访问数: 1496
- PDF下载量: 742
- 被引次数: 0
出版历程
- 收稿日期: 2000-12-01
- 修回日期: 2001-01-15
- 刊出日期: 2002-08-15

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

1.
State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, The Chinese Academy of Sciences, Beijing 100080, China;
2.
Department of Physics, Xiangtan University, Xiangtan 411105, China

摘要

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(SiC_P/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。
- 冲击 /
- 金属基复合材料 /
- 变形局部化 /
- 尺寸效应
Abstract: The effects of the reinforcing particle size and strain rate on deformation localization behavior of SiC_P/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 deformation localization than the large-particle composite under impact loading. The mechanisms leading to deformation localization in particle reinforced metal matrix composites are discussed in this paper as well.
- high strain rate /
- metal matrix composites /
- deformation localization /
- size-effect