平面冲击波在有机玻璃中的衰减规律

李金河; 尚海林; 傅华

doi:10.11858/gywlxb.20170643

平面冲击波在有机玻璃中的衰减规律

doi: 10.11858/gywlxb.20170643

中国工程物理研究院流体物理研究所冲击波物理与爆轰物理重点实验室, 四川绵阳 621999

详细信息

作者简介:
李金河(1979-), 男, 副研究员, 主要从事爆轰基础及炸药安全性研究.E-mail:leejinhe103@163.com

中图分类号: O382
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出版历程
- 收稿日期: 2017-09-20
- 修回日期: 2017-10-06

Attenuation of Plane Shock Wave in PMMA

National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, China

摘要

摘要: 采用PVDF压电式压力传感器测量了在∅100 mm平面波透镜加载下经不同厚度∅100 mm有机玻璃隔板衰减后的冲击波压力历程，实验结果与LS-DYNA数值模拟结果符合较好。研究结果表明，冲击波压力在有机玻璃中服从衰减系数为0.028 89的指数衰减规律。与其他研究者的研究结果对比说明，密实介质的衰减系数反映了其衰减特性，但受加载冲击波及装置尺寸的影响较大，应根据实际情况进行合理选择。
- 平面冲击波 /
- PMMA隔板 /
- 衰减
Abstract: In this study, we measured the pressure histories of the shock wave after passing through different thicknesses of PMMA card gaps under ∅100 mm plane wave loading by the PVDF piezofilm stress gauges.The experimental results accord well with the simulated results by LS-DYNA, which shows that the shock wave follows the exponential attenuation principle with an attenuation exponent of 0.028 89.The comparison of this result with those of other researchers' indicates that the attenuation exponent of the solid materials characterizes their attenuation capability, but is affected by given conditions such as the shock wave and the size of experiment facility, thus it is important to choose the attenuation exponent reasonably.
- plane shock wave /
- PMMA card gap /
- attenuation

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图 1 实验装置示意

Figure 1. Sketch of experimental facility

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图 2 界面压力测量结果

Figure 2. Interface pressure measured by manganin pressure gauge

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图 3 隔板厚度为100 mm时的电压和压力波形

Figure 3. Voltage and pressure waves with 100 mm card gap

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图 4 计算模型

Figure 4. Calculation model

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图 5 实验结果与数值模拟结果比较

Figure 5. Comparison of experimental and simulated results

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图 6 有机玻璃中冲击波衰减规律比较

Figure 6. Comparison of shock waveattenuation in PMMA

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表 1 不同隔板厚度输出压力

Table 1. Output pressure with different card gap thicknesses

Card gap thickness/mm	Output pressure/GPa
50	2.24
70	1.30
80	1.09
90	0.82
100	0.65

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表 2 炸药的主要计算参数

Table 2. Main computational parameters of explosive

Material	Density/(g·cm^-3)	D/(km·s^-1)	p_J/GPa	A/GPa	B/GPa	R₁	R₂	ω
Ba(NO₃)₂/TNT(78/22)	2.6	4.476	11	1 265	1.55	5.8	2.0	0.6

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表 3 有机玻璃的主要计算参数

Table 3. Main computational parameters of PMMA

Material	Density/(g·cm^-3)	a/(km·s^-1)	b
PMMA	1.186	2.598	1.516

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参考文献(11)

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