Strain-rate Relationship of Aluminum Matrix Composites Predicted by Johnson-Cook Model
Strain-rate sensitivities of 55-65vol.% 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 droped sharply.
D.Z.Zhu W.P Chen Y.Y.Li
School of Mechanical and Automobile Engineering, South China University of Technology Wushan RD., Tianhe District, Guangzhou, P.R.China, 510641
国际会议
桂林
英文
1-5
2010-11-16（万方平台首次上网日期，不代表论文的发表时间）