高温下奥克托今单晶的冲击响应特性

doi:10.3969/j.issn.1000-1093.2020.09.011

摘要/Abstract

摘要： 为研究高温下奥克托今（HMX）单晶的冲击响应特性，设计一种能够在平板撞击实验前对炸药单晶加热的装置并利用该装置进行323 K、373 K和423 K初温下HMX单晶平板撞击实验。通过激光速度干涉仪系统（VISAR）获取HMX单晶与窗口界面粒子速度历史曲线，并采用波阻抗匹配原理获得相应弹塑性力学参数。实验结果表明：在约300 m/s撞击速度下，不同初温单晶与窗口界面粒子速度历史曲线均表现出弹黏塑性双波结构；在较低初温（323 K、373 K）时，Hugoniot弹性极限相差不大，无明显温度相关性，其变形机制无明显变化；在较高初温（423 K）时，Hugoniot弹性极限增大，表现出热硬化效应，其变形机制可能由热激活变为声子阻力控制。

关键词: 奥克托今, 高温, 冲击, 界面粒子速度, Hugoniot弹性极限

Abstract: A heating device which can heat up the explosive sample before experiment is designed to investigate the shock response of octogen (HMX). The designed heating device is used to conduct the plate impact experiments of HMX single crystal at elevated temperatures of 323 K， 373 K and 423 K. The particle velocities on the interface between HMX single crystal and window at different elevated temperatures are measured by using a velocity interferometry system for any reflector (VISAR). The corresponding elastoplastic mechanical parameters of HMX single crystal are obtained by the wave impedance matching method. At an impact velocity of about 300 m/s， the particle velocity curves on the interface between single crystal and window show a distinct elastic-viscoplastic double wave structure. It is found that the Hugoniot elastic limit has no obvious temperature dependence at the elevated temperatures of 323 K and 373 K， which indicates that the plastic deformation mechanism is unchanged. At high elevated temperature of 423 K， the Hugoniot elastic limit increases， showing a thermal hardening effect. The plastic deformation mechanism may change from thermal activation to phonon resistance.

Key words: octogen, elevatedtemperature, shock, interfaceparticlevelocity, Hugoniotelasticlimit

中图分类号:

O389
TJ55

丁凯，王昕捷，吴艳青，黄风雷. 高温下奥克托今单晶的冲击响应特性[J]. 兵工学报, 2020, 41(9): 1792-1799.

DING Kai， WANG Xinjie， WU Yanqing， HUANG Fenglei. Shock Response of HMX Single Crystal at Elevated Temperatures[J]. Acta Armamentarii, 2020, 41(9): 1792-1799.

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