Strain-rate Relationship of Aluminum Matrix Composites Predicted by Johnson-Cook Model

被引：2
|
作者：
Zhu DeZhi [1 ]
Chen WeiPing [1 ]
Li YuanYuan [1 ]
机构：
[1] S China Univ Technol, Sch Mech & Automobile Engn, Guangzhou 510641, Guangdong, Peoples R China
来源：
PHYSICAL AND NUMERICAL SIMULATION OF MATERIAL PROCESSING VI, PTS 1 AND 2 | 2012年 / 704-705卷
关键词：
Composite materials; Dynamic compression; Stress-strain relationship; DEFORMATION; BEHAVIOR;
D O I：
10.4028/www.scientific.net/MSF.704-705.935
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Strain-rate sensitivities of 55-65vo1.% aluminum 2024-T6/TiB2 composites and the corresponding aluminum 2024-T6 matrix were investigated using split Hopkinson pressure bar. Results showed that 55-65vol.% aluminum 2024-T6/TiB2 composites exhibited significant strain-rate sensitivities, which were three times higher than that of the aluminum 2024-T6 matrix. The strain-rate sensitivity of the aluminum 2024-T6 matrix composites rose obviously with reinforcement content increasing (up to 60%), which agreed with the previous researches. The aluminum 2024-T6/TiB2 composites showed hybrid fracture characteristics including particle cracking and aluminum alloy softening under dynamic loading. The flow stresses predicted by Johnson-Cook model increased slowly when the reinforcement volume fraction ranged in 10%-40%. While the reinforcement volume fraction was over 40%, the flow stresses of aluminum matrix composites increased obviously and the strains dropped sharply.
引用
收藏
页码：935 / 940
页数：6
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