作者：黄家蓉, 吴飚, 王幸, 杨建超, 孔德锋

作者单位：军事科学院国防工程研究院，河南 洛阳 471023

关键词：混凝土;应力波测试;分离式霍普金森压杆;PVDF压电薄膜

摘要：

为研究传感器壳体材料对混凝土靶内应力波测试的影响，选用PVDF压电薄膜作应力敏感元件，不锈钢和铝作底板制作传感器，浇筑于混凝土试件中，养护28天后，用分离式霍普金森压杆（split Hopkinson pressure bar, SHPB）进行动态加载试验，测试入射波、透射波和靶内应力波信号，对3种波形进行分析比较。试验结果表明：用不锈钢作底板制作的传感器测试得到的靶内应力波、透射波和入射波吻合很好，用铝作底板制作的传感器浇筑的试件从内至外出现裂缝，测试获得的靶内应力波、透射波与入射波相比严重失真。因此，混凝土靶内应力波传感器选用不锈钢壳体较好。制作3个混凝土靶，各埋设一组用不锈钢壳体制作的PVDF传感器，成功测试到靶内爆炸应力波。

Experimental study on influence of sensor shell material on stress wave measurement in concrete
HUANG Jiarong, WU Biao, WANG Xing, YANG Jianchao, KONG Defeng
Institute of Defense Engineering, AMS, Luoyang 471023, China
Abstract: In order to study the influence of the sensor shell on the stress wave measurement in concrete, PVDF piezoelectric film was selected as the stress sensitive element, and stainless steel and aluminum were used as the base plate to make the sensor. After 28 days of curing, the dynamic loading test was carried out with the split Hopkinson pressure bar (SHPB) to test the incident wave, transmission wave and internal stress wave signal of the target analysis. The test results show that the stress wave, transmission wave and incident wave measured by the sensor made of stainless steel are in good agreement with each other. Cracks appear in the specimen poured by the sensor made of aluminum base plate from inside to outside, and the phase ratio of stress wave, transmission wave and incident wave obtained from the test is seriously distorted. Therefore, it is better to select stainless steel shell for stress wave sensor in concrete target. Three concrete targets were made, a group of PVDF sensors made of stainless steel shells were embedded in every concrete targets and the explosive stress wave was successfully detected.
Keywords: concrete;stress wave measurement;split Hopkinson pressure bar;PVDF piezoelectric film
2021, 47(6):144-148  收稿日期: 2020-12-10;收到修改稿日期: 2021-02-06
基金项目:
作者简介: 黄家蓉(1965-),女,四川成都市人,高级工程师,主要从事测量技术研究及应用
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