微型Hopkinson杆技术

Miniature-Hopkinson bar technique

介绍了一种可对材料进行更高应变率动态性能实验的微型Hopkinson杆技术,对金属材料其应变可超过104s-1。使用激光径向位移测试仪和与传统Hopkinson杆对比实验,对微型Hopkinson杆技术的有效性进行了验证。实验结果表明,微型Hopkinson杆确定的试样应变与激光径向位移测试的结果相当吻合;在低应变率范围内,与传统Hopkinson杆的实验结果有很好的一致性。从而证明了微型Hopkinson杆技术可进行应变率在104s-1以上材料的动态力学性能实验。

A miniature-Hopkinson bar technique, which was used to measure the mechanical behavior of materials at high strain rates, was proposed. For some metals, the strain rate can exceed 10^4s^-1. The validation of this technique was proven by using laser occlusive radius detector （LORD）, and by comparing tests with conventional Hopkinson bar technique. The results show that the strains measured by miniature Hopkinson bar technique have a good agreemant with the strains obtained with LORD. Over the low strain rate ranges, the flow stresses are consistent with that of conventional Hopkinson bar. The miniature Hopkinson bar can be utilized to measure the dynamic behavior of materials at the strain rate beyond 10^4s^-1.