The high-speed framing photography was applied to observe the shell distorting,expanding fracture mechanism of different thickness shell driven by detonation ,and jet forming,developing process of explosion scattering.Scanning electron microscopy (SEM) photographs of fractures in axial and circumferential directions for different thickness fragments were obtained.There are different fracturing modes of the two thickness shells from macroscopic analysis and the collected fragments.Results show that the fragments of 3 mm thickness shell are much bigger,longer and less than that of 1.5 mm.SEM analysis of fragments section show that their formation is mostly caused by the shear fracture.And jet fracturing process of explosion scattering can be divided into three stages: integral injection,interface appearing in flocculent and breaking,small water droplets forming.%采用高速分幅照相技术对炸药爆炸驱动不同壁厚抛撒装置的壳体变形、裂纹产生,液体射流形成及其发展过程进行了试验研究,获得了清晰的试验图像.对回收破片观察和统计分析,发现两种厚度壳体的破裂方式存在较大差别:壳体厚度为3 mm时形成的破片面积较大,数量少,以长条形为主,而厚度为1.5 mm时破片面积较小,数量多.利用扫描电镜对破片断面进行分析,发现破片的形成主要由剪切断裂造成.试验结果表明,爆炸抛撒形成的射流破碎过程可分为三个阶段:射流整体喷射、界面紊乱及其膨胀破碎、小液滴形成.
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