Abstract This paper presents insights into the flight characteristics of a ball bearing embedded in a rear detonated cylindrical charge, which represents an idealised piece of shrapnel from an improvised explosive device. A novel experimental technique was developed to quantify the loading from a blast-driven ball bearing. The impulse contributions from the blast pressure and the ball bearing impact were separately identifiable in the experimental data. Computational simulations, validated using experimental data, were used to elucidate additional detail about the momentum transfer and damage in the ball bearings during the blast event. The results show the critical influence of charge mass and aspect ratio on the development of the detonation pressure profile, its interaction with the embedded bearing, and the flight characteristics of the bearing. Length-to-diameter ratios below a critical value were more efficient in transferring momentum to the embedded bearings. These findings provide unique and detailed insights that will prove valuable to blast protection engineers considering the effects of embedded projectiles in improvised explosive devices.

中文翻译：

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后部引爆圆柱炸药内埋爆驱动球轴承的行为

摘要 本文介绍了嵌入在后起爆圆柱形装药中的滚珠轴承的飞行特性，该装药代表了简易爆炸装置的理想弹片。开发了一种新的实验技术来量化来自爆炸驱动球轴承的载荷。来自爆炸压力和滚珠轴承冲击的脉冲贡献在实验数据中可分别识别。使用实验数据验证的计算模拟被用来阐明爆炸事件期间滚珠轴承中动量传递和损坏的更多细节。结果表明装药质量和纵横比对爆轰压力分布的发展、其与嵌入式轴承的相互作用、以及轴承的飞行特性。低于临界值的长径比在将动量传递到嵌入式轴承方面更有效。这些发现提供了独特而详细的见解，对于考虑到简易爆炸装置中嵌入的射弹的影响的防爆工程师来说，这些见解将证明是有价值的。