空对地钻地弹在高速侵彻过程中,装药部的提前起爆严重影响到对攻击目标的毁伤作用,针对这个急迫需要解决的问题,对装药部(PBX炸药)在高g值载荷作用下的细观损伤模式及机理进行研究。基于一级轻气炮,应用激光测速系统监测实验试件击靶速度,由压电传感器采集实验试件应力状态,进而通过Taylor冲击加载方式对PBX炸药损伤形式进行实验研究。基于细观损伤理论,结合扫描电子显微镜(SEM)对其损伤模式进行分析,结果表明,在较小冲击载荷作用下,晶体颗粒表面与粘结剂之间的剪切脱粘细观损伤模式最先发生;随着冲击载荷能量的增加,产生了细观损伤裂纹,并不断沿应力薄弱路径急剧传播,且萌生新的损伤裂纹,裂纹传播错综复杂,进而导致颗粒破碎,发生穿晶断裂、粘结剂劈裂等细观损伤模式,从而导致该PBX炸药宏观损伤裂纹的出现。PBX炸药细观损伤理论对该PBX炸药细观损伤模式的预测结果与实验分析结果基本相符,该细观损伤理论为其细观损伤机理研究提供了重要依据。
Abstract
In high velocity penetration process of air-ground penetrating bombs,pre-initiation of charge (PBX explosive) seriously affects damage to targets. Aiming at this problem urgently needed to be solved,meso-damage modes and mechanism of PBX explosive were studied under high g-value loading. Based on the first stage light gas gun,a laser speed measurement system was used to monitor tested specimens’ speed to hit targets,piezoelectric sensors were used to collect stress states of tested specimens,and the damage form of PBX explosive was studied under Taylor impact loading. Based on the meso-damage theory,meso-damage modes of PBX explosive were analyzed using the scanning electronic microscope (SEM). The results showed that the shear de-bonding meso damage mode between crystal particles’ surface and binder firstly occurs under a smaller impact load; with increase in impact load energy,meso-damage cracks appear,and they spread rapidly along weak stress paths to produce new damage cracks,crack propagations are so complicated to cause particles broken,meso-damage modes,such as,trans-granular fracture and binder splitting happen to lead to occurrence of PBX explosive’s macroscopic damage cracks; the prediction results of PBX explosive’s meso-damage modes using the meso-damage theory of PBX explosive agree well with those of test analysis,the proposed PBX explosive’s meso-damage theory provides an important basis for studying its meso-damage mechanism.
关键词
冲击载荷 /
PBX炸药 /
变形破坏 /
细观损伤
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Key words
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impact loading;PBX explosive;deformation failure;meso-damage
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脚注
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