On the analysis of transverse stress gauge data from shock loading experiments
On the analysis of transverse stress gauge data from shock loading experiments
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DOI：
10.1088/0022-3727/29/9/035
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发表时间：
1996-09
期刊：
影响因子：
--
通讯作者：
J. Millett;N. Bourne;Z. Rosenberg
中科院分区：
文献类型：
--
作者：
J. Millett;N. Bourne;Z. Rosenberg
理解剪切强度随压力的变化在本构模型的制定中的重要性早已被认识到。以前，这是通过测量材料的Hugoniot曲线与计算的静水压力的偏移量推导出来的。在最近的论文中，已经提出了一种直接测量技术，其中使用压阻计测量应力的两个主分量。从横向应力计收集的数据的减少引起了一些争论，并在这里进行审查。特别是，必须考虑压力计所经历的应力和应变状态。研究了应变片在纵向应力或压力作用下的硬化现象。给出了金属和陶瓷实验的例子。对量规几何形状的影响进行了评估，结果表明，在相同的冲击条件下，两种量规测得的应力相差在0.5%以内。还对压力计周围绝缘厚度的影响进行了调查，再次发现对测量应力没有影响。
The importance of understanding the variation of shear strength with pressure in the formulation of constitutive models has long been recognized. Previously, this had been deduced by measurements of the offset of the Hugoniot curve for a material from the calculated hydrostat. In recent papers, a direct measurement technique has been suggested in which both principal components of stress are measured using piezoresistive gauges. The reduction of the data collected from transverse stress gauges has attracted some debate and is reviewed here. In particular, the stress and strain states experienced by the gauge must be considered. The hardening of the gauge with longitudinal stress or pressure was investigated. Examples from experiments in metals and ceramics are given. The effect of gauge geometry was assessed and results show that the measured stresses from either gauge were within 0.5% of each other when subjected to identical impact conditions. An investigation was also performed on the effect of insulation thickness around the gauge and again no effect on the measured stress was found.