Abstract The distribution characteristics of the explosion wave field of a cylindrical charge were investigated in this paper via a high-speed schlieren experiment. Based on the fractal theory, the paper studies the crack propagation characteristics of the media under the action of the cylindrical charge explosion impact at different initiation points. The results show that the velocity of detonation appeared attenuation region when the detonation wave changes to the shock wave, and a certain angle of detonation wave ranging from 580to 62°. Based on the schlieren experiment and the theoretical model, the included angle between the explosion wave in the vicinity of the detonation point and the blasthole wall surface is about 90°, during a stable explosion, the ultimate included angle between the explosion wave and the blasthole wall surface is about 60°. Based on the analysis of the propagation characteristics of the explosion cracks of the cylindrical charge, the angle of incident makes the initiation and propagation of the cracks around the blasthole deflect and the angle of deflection coincides with the theoretical calculation value. The pulverization zone formed in the vicinity of the detonation point is larger than in other zones, but the crack zone is smaller than in other zones. Moreover, the cracking range produced by the cylindrical charge is roughly the range of its five-fold blasthole diameter. There were significant fractal characteristics, within the range of one-to two-fold blasthole diameter, the medium is completely pulverized and forms a zone of dense cracks; within the range of three-to four-fold blasthole diameter, the medium is severely damaged and a crack transition zone forms; five-fold blasthole diameter, there are a few explosion cracks in the medium and a zone of sparse cracks forms.

中文翻译：

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圆柱装药爆炸波及爆炸断裂特性

摘要 本文通过高速纹影实验研究了圆柱形装药爆炸波场的分布特性。论文基于分形理论，研究了圆柱装药爆炸冲击作用下不同起爆点介质的裂纹扩展特性。结果表明，当爆震波转变为冲击波时，爆轰速度出现衰减区，一定的爆震波角度范围为580°～62°。根据纹影实验和理论模型，爆点附近的爆炸波与炮孔壁面的夹角约为90°，稳定爆炸时，爆炸波与炮孔壁面的极限夹角约为60°。通过对圆柱装药爆炸裂纹扩展特性的分析，入射角使炮眼周围裂纹的萌生和扩展发生偏转，偏转角度与理论计算值吻合。在爆点附近形成的粉化区比其他区大，但裂纹区比其他区小。而且，圆柱形装药产生的开裂范围大致是其五倍炮眼直径的范围。具有显着的分形特征，在1～2倍炮眼直径范围内，介质完全粉化，形成致密裂纹区；在3～4倍炮眼直径范围内，介质受到严重破坏，形成裂纹过渡带；5倍炮眼直径，介质中存在少量爆炸裂纹，形成稀疏裂纹区。