装配垫层与间隙对爆轰加载下金属飞片运动特征的影响
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摘要
采用激光干涉测速技术,研究了装配0.5mm厚泡沫垫层或空气间隙对RHT-901炸药爆轰加载下45钢飞片运动特征的影响,得到在两种装配条件下爆轰驱动飞片的自由面速度历史,对比分析了装配垫层与间隙之间的差异。实验研究发现,装配垫层和间隙对金属飞片运动特征的影响显著,主要包括速度起跳时刻、速度起跳幅值和末速度。对于炸药-金属间的装配垫层和间隙,垫层比间隙处的速度起跳时刻晚约30ns,起跳幅值高约13%,末速度低;对于金属-金属间的装配垫层和间隙,垫层处比间隙处的速度起跳时刻早约200ns,起跳幅值低约6%,末速度低。基于连续介质的应力波传播特性,对该影响规律进行了分析,通过估算爆轰产物向空气中飞散的速度,佐证了分析结果的合理性。
Based on a Doppler pin system,we studied the influence of a 0.5 mm-thick foam layer and an air clearance on the kinetic characteristic of a 45 steel flyer under the detonation of the RHT-901 explosive,and analyzed the difference in this influence as is shown between a single-flyer assembly and a double-flyer assembly according to the free surface velocity-time curves of the flyer of each.The experimental results show that the foam cushion and air clearance significantly affect the kinetic characteristics of the 45 steel flyer,including the take-off time of the flyer,the velocity jump amplitude and the final velocity.Comparing the effect of a foam cushion and that of an air clearance between the explosive and the metal flyer in the single-flyer assembly,we found that the take-off time of the metal flyer in the foam cushion region is later by about 30 ns and the speed jump amplitude is higher by about 13%as compared to that in the air clearance area;comparing it in the double-flyer assembly,we found that the take-off time is advanced by about 200 ns and the speed jump amplitude is reduced by about 6%.Nevertheless,the final velocities in the foam cushion region are lower than that in the air clearance area in the two experiments.Finally,we analyzed the influence pattern based on the stress wave propagation in continuum matter,and verified the rationality of the theoretical explanation by estimating the velocity of denotation products flying through air.
Based on a Doppler pin system,we studied the influence of a 0.5 mm-thick foam layer and an air clearance on the kinetic characteristic of a 45 steel flyer under the detonation of the RHT-901 explosive,and analyzed the difference in this influence as is shown between a single-flyer assembly and a double-flyer assembly according to the free surface velocity-time curves of the flyer of each.The experimental results show that the foam cushion and air clearance significantly affect the kinetic characteristics of the 45 steel flyer,including the take-off time of the flyer,the velocity jump amplitude and the final velocity.Comparing the effect of a foam cushion and that of an air clearance between the explosive and the metal flyer in the single-flyer assembly,we found that the take-off time of the metal flyer in the foam cushion region is later by about 30 ns and the speed jump amplitude is higher by about 13%as compared to that in the air clearance area;comparing it in the double-flyer assembly,we found that the take-off time is advanced by about 200 ns and the speed jump amplitude is reduced by about 6%.Nevertheless,the final velocities in the foam cushion region are lower than that in the air clearance area in the two experiments.Finally,we analyzed the influence pattern based on the stress wave propagation in continuum matter,and verified the rationality of the theoretical explanation by estimating the velocity of denotation products flying through air.
引文
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[2]向梅,黄毅民,韩勇,等.JO-9159与JB-9014复合药柱爆轰驱动平面飞片实验与数值模拟[J].高压物理学报,2014,28(3):379-384.XIANG M,HUANG Y M,HAN Y,et al.Experimental study and numerical simulation of plane flyer driven by detonation of JO-9159and JB-9014composite charge[J].Chinese Journal of High Pressure Physics,2014,28(3):379-384.
[3]金山,陈永涛,汤铁钢,等.多点激光干涉测速系统和电探针技术在飞片速度测量中的应用对比[J].高压物理学报,2012,26(5):571-576.JIN S,CHEN Y T,TANG T G,et al.Comparison of multi-channel VISAR and electric probe technology in measuring free-surface velocity of metal flyer[J].Chinese Journal of High Pressure Physics,2012,26(5):571-576.
[4]王德田,李泽仁,吴建荣,等.光纤位移干涉仪在爆轰加载飞片速度测量中的应用[J].爆炸与冲击,2009,29(1):105-108.WANG D T,LI Z R,WU J R,et al.An optical-fiber displacement interferometer for measuring velocities of explosively-driven metal plates[J].Explosion and Shock Waves,2009,29(1):105-108.
[5]陈永涛,洪仁楷,吴建华,等.爆轰波对碰加载下平面Sn材料动力学行为实验研究[J].高压物理学报,2016,30(3):221-226.CHEN Y T,HONG R K,WU J H,et al.Experimental study on dynamic behaviors of Sn sample driven by two head-on colliding detonation waves[J].Chinese Journal of High Pressure Physics,2016,30(3):221-226.
[6]文尚刚,赵锋,王建,等.气炮加载下炸药强爆轰驱动技术的初步实验研究[J].高压物理学报,2011,25(1):36-40.WEN S G,ZHAO F,WANG J,et al.Primary experimental study on driving technique of strong detonation using gas gun[J].Chinese Journal of High Pressure Physics,2011,25(1):36-40.
[7]金柯,李平,吴强,等.爆轰产物驱动飞片运动数值模拟研究[J].爆炸与冲击,2004,24(5):419-424.JIN K,LI P,WU Q,et al.Numerical simulation on acceleration process of flyer driven by detonation product through an air cushion[J].Explosion and Shock Waves,2004,24(5):419-424.
[8]赵剑衡,赵锋,文尚刚,等.带空腔爆轰加载装置对驱动飞片的影响[J].爆炸与冲击,2001,21(4):307-310.ZHAO J H,ZHAO F,WEN S G,et al.The effects of explosive device with a cavity on flyer driving[J].Explosion and Shock Waves,2001,21(4):307-310.
[9]ORLENKO L P.爆炸物理学[M].第3版.孙承纬,译.北京:科学出版社,2011:416.
[10]赵同虎,韩立石,何智.猛炸药RHT-901和钝感炸药IHE-2的爆轰波直角绕射[J].高压物理学报,1998,12(4):264-270.ZHAO T H,HAN L S,HE Z.The rectangular diffraction of detonation wave in the high explosive RHT-901and the insensitive high explosive IHE-2[J].Chinese Journal of High Pressure Physics,1998,12(4):264-270.