Stress-testing method by PVDF gauge and its application in explosive test of porous material

Hu Yafeng; Liu Jianqing; Gu Wenbin; Jin Jianfeng

doi:10.11883/1001-1455(2016)05-0655-08

Volume 36 Issue 5

Oct. 2018

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Hu Yafeng, Liu Jianqing, Gu Wenbin, Jin Jianfeng. Stress-testing method by PVDF gauge and its application in explosive test of porous material[J]. Explosion And Shock Waves, 2016, 36(5): 655-662. doi: 10.11883/1001-1455(2016)05-0655-08

Citation:

Hu Yafeng, Liu Jianqing, Gu Wenbin, Jin Jianfeng. Stress-testing method by PVDF gauge and its application in explosive test of porous material[J]. Explosion And Shock Waves, 2016, 36(5): 655-662. doi: 10.11883/1001-1455(2016)05-0655-08

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Stress-testing method by PVDF gauge and its application in explosive test of porous material

doi: 10.11883/1001-1455(2016)05-0655-08

1.
Huayin Ordnance Test Center, Huayin 714200, Shanxi, China
2.
PLA University of Science and Technology, Nanjing 210007, Jiangsu, China

Received Date: 2015-03-24
Rev Recd Date: 2015-05-22
Publish Date: 2016-09-25

Abstract

Abstract

In this work, by accurately measuring the bullet speed of the Hopkinson bar, we succeeded in the dynamic calibration of the PVDF pressure sensor. The test data obtained have a good linearity and a deviation below 1.9%. The coefficient value K of dynamic sensitivity is 32.83 pC/N. By applying a blast loading of 500 g TNT to the composite structure of "steel-aluminum foam-steel", the propagation of the stress wave between its components was measured. The results show that the voltage signal can accurately represent the loading time and the propagation velocity of the elastic wave and plastic wave and the PVDF dynamic response of elastic stress wave with high-frequency signal is sensitive and accurate, with only a relative deviation of less than 3.5% from the theoretical data. The measured propagation velocity of the plastic wave in the aluminum foam is 590 m/s, the transmission coefficient of the plastic wave in A1-B1 interface is 0.53, which is much higher than that of the elastic wave. Special remarks were made concerning the unusual phenomena observed in the stress curve based upon our understanding of the mechanism, providing a reference for relevant explosion tests.
- mechanics of explosion,
- explosion test,
- aluminum foam,
- PVDF sensor

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References(15)

References

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