摘要
用万能试验机和分离式霍普金森拉杆对7A52铝合金进行了准静态和动态拉伸性能测试,结合数字图像相关方法(digital imaging correlation,DIC)观测试样动态破坏图像,分析全应变场信息,研究局部应变分布和应变率特性,与传统霍普金森拉杆的电测法数据进行对比,验证霍普金森杆动态拉伸试验结果的有效性。结果表明:7A52铝合金的动态拉伸屈服强度和流动应力有明显的应变率效应,且动态加载下材料的应变硬化能力提升。DIC测试结果显示在动态拉伸过程中,试样中部X方向出现应变集中,在第500μs时达最大值13%,与电测法得到的真实应力-应变曲线中的最大应变值相当,且DIC测试得到的X方向平均应变率与电测法获得值相当,验证了霍普金森杆拉伸试验结果的有效性。
The quasi-static and dynamic tensile properties of 7A52 aluminum alloy were tested using universal testing machine and split Hopkinson bar. Combined with digital image correlation(DIC),the dynamic failure image of the sample was observed,and the full strain field information was analyzed. The local strain distribution and strain rate characteristics were studied,which was compared with the electrical measurement data of the traditional Hopkinson bar to verify the validity of the results of Hopkinson bar dynamic tensile test. The results show that the dynamic tensile yield strength and flow stress of 7A52 aluminum alloy have obvious strain rate effects,and the strain hardening ability of the material is improved under dynamic loading. The DIC test results show that during the dynamic stretching process,strain concentration occurs in the X direction in the middle of the sample,reaching a maximum value of 13% at the 500 μs,which is equivalent to the maximum strain value in the true stressstrain curve obtained by the electrical measurement method,and the average strain rate in the X direction obtained by the DIC test is equivalent to the value obtained by the electrical measurement method,which verifies the validity of the Hopkinson bar tensile test results.
作者
王彦莉
万明明
牟晓明
尹飞
厉雪
梁家毅
白嵘
WANG Yanli;WAN Mingming;MU Xiaoming;YIN Fei;LI Xue;LIANG Jiayi;BAI Rong(Ningbo Branch of Chinese Academy of Ordnance Science,Yantai 264003,China;Military Representative Office of the Army Equipment Department in Nanjing,Yantai 264003,China)
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2023年第2期78-83,共6页
Ordnance Material Science and Engineering
基金
横向合作课题。
