摘要
作为高应变率材料力学性能测试的主要手段,霍普金森压杆实验的测试时长受到压杆长度限制,试件无法在较宽广的应变率下实现大变形.由此提出了一种在有限杆长下实现大变形加载的实验技术,该技术将传统上用于超高应变率实验的直接撞击方法应用于较低应变率下的材料动态性能测试,可实现102s-1量级应变率下材料较大变形下的动态应力—应变曲线测试.实际应用表明该方法简单有效.并且文中也对该技术的适用范围、实验装置的几何参数及材料参数对测试结果的影响进行了分析讨论.
As a major method of mechanical property test under high strain rate, the time duration of the Hopkinson Bar test is limited by the length of the pressure bars, and the specimen can＇t achieve large deformation in a wide range of strain rate. In this paper, an experimental technique for large deformation loading with finite bar length is presented. The traditional method of direct impact test for ultra-high strain rate test has been applied to the dynamic performance testing of materials in relatively lower strain rate. Using this technique, the dynamic stress-strain curve of materials under the strain rate in the order of 102 s-1 can be obtained. Practical application shows that the method is simple and effective. The range of application of the technique, the geometrical parameters of the experimental device and the influence of the material parameters on the test results are also discussed.
作者
陈浩
郭鑫
宋力
CHEN Hao;GUO Xin;SONG Li(Faculty of Mechanical Engineering ＆ Mechanics,Ningbo University,Ningbo 315211,China)
出处
《宁波大学学报（理工版）》
CAS
2018年第4期70-73,共4页
Journal of Ningbo University：Natural Science and Engineering Edition
基金
国家自然科学基金(11272162)
浙江省教育厅科研项目(Y200907622)
宁波大学科技学院预研项目(003-21021003)
关键词
直接撞击
霍普金森压杆
大变形
direct impact
Hopkinson pressure bar
large deformation
