Bounds of Application of the Sensing Block Method for Measuring Dynamic Load.
Bounds of Application of the Sensing Block Method for Measuring Dynamic Load.
复制标题
传感块法测量动载荷的应用范围。
DOI：
10.1299/kikaia.68.1767
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
K. Mimura
中科院分区：
文献类型：
--
作者：
S. Tanimura;T. Umeda;K. Mimura
近年来，精确测量材料在大应变率范围内的应力应变关系，以精确地建立率敏感材料的本构方程，已引起人们越来越多的关注。霍普金森压杆系统被广泛用于此目的。然而，该装置应该足够长，以防止应力波从输入和输出杆的端部立即反射。新开发的传感块（SB）系统，它包括一个小的传感突起和一个相对较大的质量块，预计将广泛用于许多材料。本文用数值方法研究了SB法测量动载荷的适用范围。明确了传感突起尺寸与载荷上升时间的关系，以满足各种模型精度的要求。结果表明，在所确定的条件下，动载荷的测量具有足够的精度。
In recent years, an increasing interest has been paid to the accurate measurement of stress-strain relations of materials for wide range of strain rates which are needed to formulate the constitutive equations of rate-sensitive materials precisely. The Hopkinson Pressure Bar system is widely used for this purpose. However, the device should be long enough to prevent the immediate reflection of stress waves from the ends of the input and output bars. The newly developed Sensing Block (SB) system, which consists of a small sensing projection and a relatively large mass block, is expected to be used widely for many materials. In this paper, the bounds of application of the SB method for measuring dynamic load was examined numerically. The relation between the size of sensing projection and the rising time of applied load was cleared to satisfy some criterions on the accuracy for each model. The results ensure the sufficient accuracy for measuring dynamic load under the obtained conditions.