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首页> 外文期刊>The European physical journal, E. Soft matter >Explosively driven fragmentation of granular materials
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Explosively driven fragmentation of granular materials

机译：爆炸驱动的粒状物料破碎

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This paper investigates the explosively driven dynamics of dry and wet sand. Contrary to popular belief, wet sand under high strain rate loadings (10~4s~(-1)) is observed to have reduced resistance against flow compared to the dry sand, which is supported by a noticeably enhanced expansion before the breakup followed by an increased number of fragments. Even a small amount of interstitial oil (3.2wt.%) suffices to substantially reduce the size of fragments whose average mass only amounts to 60% of the mass of the dry sand fragments. To predict the instability onset of the expanding sand shell, a kinetic instability model is proposed based on an instability criterion involving the opposing forces of stabilizing inertial pressures and destabilizing viscous resistance. The interstitial oil leads to a smaller viscous resistance of wet sand by the lubrication effect as well as lessening the degree of shock compaction. The dominance of viscous resistance thus commences later for the wet sand shell until a smaller thickness allows the inertial forces to be overtaken. Moreover, multi-shear localizations rather than interface instability are identified as the dominant mechanism for the instability onset of the expanding sand shells. Graphical abstract: [Figure not available: see fulltext.]
机译：本文研究了干砂和湿砂的爆炸驱动动力学。与普遍的看法相反，在高应变速率载荷下（10〜4s〜（-1）），湿砂相比于干砂具有更低的抗流动性，这是由于在破裂前明显增强了膨胀，随后又发生了破裂。碎片数量增加。即使是少量的填隙油（3.2wt。％）也足以显着减小碎块的大小，碎块的平均质量仅占干砂碎块质量的60％。为了预测膨胀砂壳的不稳定性起因，基于不稳定性判据，提出了一个动力学不稳定性模型，该模型涉及稳定惯性压力和破坏稳定粘性阻力的反作用力。间隙油通过润滑作用导致较小的湿沙粘性阻力，并降低了冲击压实度。因此，对于湿砂壳，粘性阻力的优势随后开始，直到更小的厚度允许惯性力被超越。此外，多剪切局部化而非界面不稳定性被确定为膨胀砂壳失稳开始的主要机制。图形摘要：[该图不可用：请参见全文。]

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