应变式压杆压力传感器在冲击波载荷测试中的应用  

Strain Type Pressure Rod Gauge Used for Measuring Blast Loading

作　　者：胡永乐[1] 林俊德[2] 金飞华[2] 石培杰[2] 胡昊[2] 

机构地区：[1]浙江大学机械与能源工程学院,杭州310027 [2]西北核技术研究所,陕西西安710024

出　　处：《实验力学》2006年第5期547-552,共6页Journal of Experimental Mechanics

摘　　要：在近区爆炸冲击波载荷测量中,压电式压力传感器因上升时间短且强度高的高频压力脉冲作用而可能产生疲劳和过载失效。本文根据应力波在细长圆柱弹性杆中的传播特性,设计了一种应变式压杆压力传感器,当圆柱杆的一端受到压力波作用时,产生的弹性应力波沿杆轴向传播,通过测量杆的轴向应变可计算出杆中传播的应力波,从而得到作用在杆端的压力波。为了检验压杆压力传感器的性能,采用一个厚壁圆柱形爆炸容器,并将传感器安装在容器壁面不同位置上,测量中心装药产生的爆炸冲击波载荷,经反复试验,结果表明这种传感器性能是稳定可靠的。In the close-in blast loading measurement, it is possible that a piezoelectric type pressure transducer may encounter failure of rapid fatigue and overload due to action of high frequency and intense pressure impulse. In this paper, a strain type pressure rod gauge for measuring the close-in blast loading is designed based on the characteristic of the propagation of stress wave in a cylindrical slender elastic bar. When one end of the bar is struck by pressure wave, an elastic stress wave propagates along the axial direction of the bar. By measuring the axial direction strain in the bar the amplitude of elastic stress wave propagation can be calculated using Hooke＇s law, then the pressure wave which strikes the end of the bar is obtained. The performance of the pressure rod gauge is verified. In the testing, the pressure rod gauge is located in several positions on the wall of the thickwalled cylinder explosion container to measure the blast loading produced by concentrated explosive. The pressure rod gauge is tested with repeated experiments and the results show that the performance of the gauge is reliable.

关 键 词：冲击波载荷 应变式压杆压力传感器 爆炸容器 测试系统 

分 类 号：O384[理学—流体力学]