Development of a Compact Dynamic Loading Device with a Stress Sensing Block and Its Application to the Evaluation of Stress-Strain Relations at High Rates of Strain.
Development of a Compact Dynamic Loading Device with a Stress Sensing Block and Its Application to the Evaluation of Stress-Strain Relations at High Rates of Strain.
复制标题
具有应力传感块的紧凑型动态加载装置的开发及其在高应变率下应力-应变关系评估中的应用。
DOI：
10.1299/kikaia.62.2609
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
S. Tanimura
中科院分区：
文献类型：
--
作者：
K. Mimura;Shin Hirata;Yoshitaka Chuman;S. Tanimura
本文介绍了一种应变率范围为300 ~ 1500/s的小型动态加载装置，它能使我们测量长应力脉冲而不受波反射和干涉的干扰。采用了一种特殊的测压元件机构，应力传感块，它由一个相对较大的质量块的小圆柱形旋钮，并通过磁性线性编码器测量试样的位移。在该装置中，输入输出杆系统的尺寸可减小到普通分离式Hopkinson杆装置的1/2或1/3，而获得的应力-应变曲线的精度与分离式Hopkinson杆装置的精度相当。为了验证该装置的适用性，对几种面心立方、体心立方和六方晶系金属的应力-应变关系进行了测量，并讨论了它们的实验趋势。
A compact dynamic loading device for the strain rate range from 300/s to 1500/s which enables us to measure a long stress pulse without wave disturbance due to wave reflection and interference has been developed and examined. A special load cell mechanism, a stress sensing block, which consists of the small cylindrical knob followed by a relatively large mass block was employed, and the displacement of the specimen was measured by means of the magnetic linear encoder. In this device, the dimension of input and output bar system can be reduced to 1/2 or 1/3 of that of a ordinary split Hopkinson bar device, while the accuracy of the obtained stress-strain curves retains the same level of that obtained by the split Hopkinson bar device. In order to verify the applicability of the device, stress-strain rerations of several fcc, bcc and hcp metals were measured, and their experimental tendencies are discussed.