PVDF应力测试技术及其在多孔材料爆炸冲击实验中的应用

胡亚峰; 刘建青; 顾文彬; 金建峰

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

PVDF应力测试技术及其在多孔材料爆炸冲击实验中的应用

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

1.
中国华阴兵器试验中心，陕西华阴 714200
2.
解放军理工大学，江苏南京 210007

基金项目:

爆炸冲击防灾减灾国家重点实验室开放基金项目 DPMEIKF201407

详细信息

作者简介:
胡亚峰(1988—)，男，硕士，工程师, 827734300@qq.com

中图分类号: O384
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- 被引次数: 0
出版历程
- 收稿日期: 2015-03-24
- 修回日期: 2015-05-22
- 刊出日期: 2016-09-25

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

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

摘要

摘要: 通过精确测量Hopkinson杆子弹速度，实现了对PVDF压力传感器的动态标定，测试数据线性度良好，误差不超过1.9%，得到动态灵敏度系数K=32.83 pC/N，采用500 g TNT对“钢板-泡沫铝-钢板”复合结构进行爆炸冲击加载，测量结构间应力波的传播情况。研究结果表明：电压测试信号可以较为准确地反映弹性波与塑性波的加载时间和传播速度，PVDF对弹性应力波段高频信号的动态响应灵敏准确，与理论数据的相对误差为3.5%。测得泡沫铝材料中塑性波的传播速度为590 m/s，A₁-B₁界面塑性波透射系数达到了0.53，远高于弹性波透射系数。从机理上对应力时程曲线中出现的特殊现象进行了阐述，为相关爆炸测试提供参考。
- 爆炸力学 /
- 爆炸测试 /
- 泡沫铝 /
- PVDF传感器
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

HTML全文

图 1 电流模式测量电路

Figure 1. Measuring circuit based on current mode

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图 2 PVDF传感器标定系统

Figure 2. System for calibrating PVDF sensors

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图 3 脉冲应力对PVDF传感器的作用过程

Figure 3. Mechanism of stress wave on PVDF sensors

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图 4 Hopkinson杆冲击的电压信号

Figure 4. Voltage signal of Hopkinson bar impacting

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图 5 电压信号的积分曲线

Figure 5. Integral curve of voltage signal

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图 6 总体线性拟合

Figure 6. Overall linear fitting

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图 7 分组线性拟合

Figure 7. Group linear fitting

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图 8 实验装置示意图

Figure 8. Sketch of experimental apparatus

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图 9 实验现场

Figure 9. Testing site

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图 10 泡沫铝变形情况

Figure 10. Deformation of aluminum foam

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图 11 实验所测电压信号

Figure 11. Voltage signal of test

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图 12 积分所得应力时程曲线

Figure 12. Time history curves of stress by integration

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表 1 Hopkinson杆冲击测试数据

Table 1. Measurement data of Hopkinson bar impacting

传感器1			传感器2
v/(m·s^-1)	σ/MPa	Ω_max/pC	v/(m·s^-1)	σ/MPa	Ω_max/pC
8.03	56	2 300	9.67	68	2 640
6.12	43	1 820	7.24	51	2 170
9.31	65	2 560	5.16	36	1 690
10.97	77	2 880	14.60	102	3 880
13.35	93	3 490	20.76	145	5 340
14.69	103	3 910	24.38	171	5 850
20.50	143	5 240
24.11	169	6 060

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表 2 实验相关参数(炸高15 cm)

Table 2. Related parameters(blasting height: 15 cm)

泡沫铝	δ/%	ρ/(g·cm^-3)	d/mm	传感器	布设位置	R/Ω
B1	84.5	0.418 5	2.5	1	A1-B1	42.68
B2	80.8	0.518 4	2.0	2	B1-B2	43.02
B3	77.6	0.604 8	2.0	3	B2-B3	42.28

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