Design of a split Hopkinson pressure bar with partial lateral confinement
Design of a split Hopkinson pressure bar with partial lateral confinement
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DOI：
10.1088/0957-0233/27/12/125903
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发表时间：
2016-10
影响因子：
2.4
通讯作者：
A. Barr;S. Clarke;S. Rigby;A. Tyas;J. Warren
中科院分区：
文献类型：
--
作者：
A. Barr;S. Clarke;S. Rigby;A. Tyas;J. Warren
本文介绍了改进的分体式霍普金森压力杆 (SHPB) 的设计，其中样本的部分横向限制是由长钢储液器中包含的流体环的惯性提供的。与无侧限测试或在轴向加载之前施加恒定的单元压力相比，允许在整个轴向加载过程中形成横向约束：这使得能够在更能代表埋藏爆炸事件的条件下表征土壤的高应变率剪切行为。位于储层壁中的压力传感器可以量化横向应力，并且使用色散校正技术来提供轴向应力和应变的精确测量。利用初步的数值模型为实验设计提供信息，并通过干燥石英砂的样本结果证明了设备的功能。
This paper presents the design of a modified split Hopkinson pressure bar (SHPB) where partial lateral confinement of the specimen is provided by the inertia of a fluid annulus contained in a long steel reservoir. In contrast to unconfined testing, or a constant cell pressure applied before axial loading, lateral restraint is permitted to develop throughout the axial loading: this enables the high-strain-rate shear behaviour of soils to be characterised under conditions which are more representative of buried explosive events. A pressure transducer located in the wall of the reservoir allows lateral stresses to be quantified, and a dispersion-correction technique is used to provide accurate measurements of axial stress and strain. Preliminary numerical modelling is utilised to inform the experimental design, and the capability of the apparatus is demonstrated with specimen results for a dry quartz sand.