当前位置：
X-MOL 学术
›
Propellants Explos. Pyrotech.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Effect of Continuous Damage Accumulation on Ignition of HMX‐Based Polymer Bonded Explosives under Low‐Velocity Impact
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2020-10-30 , DOI: 10.1002/prep.202000107 Rui Liu 1 , Pengwan Chen 1 , Xiaotian Zhang 2
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2020-10-30 , DOI: 10.1002/prep.202000107 Rui Liu 1 , Pengwan Chen 1 , Xiaotian Zhang 2
Affiliation
|
The ignition phenomena of polymer‐bonded explosives (PBXs) due to hotspot formation from grit/friction, shear band formation, and friction between microcrack surfaces have not yet been clarified. Microcracks are known to play a critical role in PBX ignition under low‐velocity impacts. Further, microcrack evolution determines whether or not a specimen ignites because of complex mechanical‐thermal‐chemical coupled processes. Although many studies have investigated the multiphysics processes of ignition under single impacts, few have investigated multiple‐impact scenarios that are more likely in reality. The present study focuses on the influence of continuous damage accumulation during multiple impacts on the safety assessment of octahydro‐1,3,5,7‐Tetranitro‐Tetrazocine (HMX)‐based PBXs. The Visco‐SCRAM model combined with restart technology is applied to conduct simulations with the standard confined Steven test. By controlling the first impact velocity, the damage accumulation could be designed. When the first impact velocity increases from 5 to 20 m/s, the second impact velocity threshold decreases from 34 to 22 m/s and specific mechanical energy decreases from 600 to 240 m2/s2. Multiple impacts change the temperature distribution and ignition position. Further, different projectile shapes influence multiple impacts differently. Owing to continuous damage accumulation, the second impact velocity threshold decreases for flat and pin projectiles. Dimensionless analysis reveals that the trends of critical dimensionless parameters for flat and pin projectiles are similar, whereas oval projectiles show a different response.
中文翻译：
低速冲击下持续损伤累积对HMX基聚合物粘结炸药着火的影响
尚未弄清由于砂砾/摩擦形成热点，剪切带形成以及微裂纹表面之间的摩擦而导致的聚合物粘结炸药（PBX）的着火现象。在低速撞击下，微裂纹在PBX点火中起着关键作用。此外，微裂纹的发展决定了样品是否由于复杂的机械-热化学耦合过程而点燃。尽管许多研究已经研究了单一冲击下点火的多物理场过程，但很少研究现实中更有可能发生的多重冲击情况。本研究的重点是基于八氢1,3,5,7-四硝基-四唑（PBX）的PBX的安全性评估中多次冲击期间连续损伤积累的影响。将Visco-SCRAM模型与重新启动技术相结合，可以使用标准的受限Steven测试进行模拟。通过控制第一冲击速度，可以设计损伤累积。当第一冲击速度从5上升到20 m / s时，第二冲击速度阈值从34下降到22 m / s，比机械能从600下降到240 m2 /秒2。多重冲击会改变温度分布和点火位置。此外，不同的弹丸形状对多种冲击的影响也不同。由于持续的损伤积累，扁平和弹丸的第二冲击速度阈值降低。无量纲分析表明，扁平和弹丸的关键无量纲参数的趋势相似，而椭圆形弹丸显示出不同的响应。
更新日期：2020-12-07
中文翻译：
低速冲击下持续损伤累积对HMX基聚合物粘结炸药着火的影响
尚未弄清由于砂砾/摩擦形成热点，剪切带形成以及微裂纹表面之间的摩擦而导致的聚合物粘结炸药（PBX）的着火现象。在低速撞击下，微裂纹在PBX点火中起着关键作用。此外，微裂纹的发展决定了样品是否由于复杂的机械-热化学耦合过程而点燃。尽管许多研究已经研究了单一冲击下点火的多物理场过程，但很少研究现实中更有可能发生的多重冲击情况。本研究的重点是基于八氢1,3,5,7-四硝基-四唑（PBX）的PBX的安全性评估中多次冲击期间连续损伤积累的影响。将Visco-SCRAM模型与重新启动技术相结合，可以使用标准的受限Steven测试进行模拟。通过控制第一冲击速度，可以设计损伤累积。当第一冲击速度从5上升到20 m / s时，第二冲击速度阈值从34下降到22 m / s，比机械能从600下降到240 m2 /秒2。多重冲击会改变温度分布和点火位置。此外，不同的弹丸形状对多种冲击的影响也不同。由于持续的损伤积累，扁平和弹丸的第二冲击速度阈值降低。无量纲分析表明，扁平和弹丸的关键无量纲参数的趋势相似，而椭圆形弹丸显示出不同的响应。
京公网安备 11010802027423号