High-resolution numerical simulations of cracks driven by an internal pressure in a heterogeneous and brittle granular medium produce fragment-size distributions with the same characteristics as experiments on blasted cylinders of mortar and rock in both the fine- and the intermediate-size-fragment regions. To mimic full-scale blasts used, e.g., within the mining industry, the cracks propagate in a medium that is under compression, neutral, or under tension. In a compressive environment, shear fracture produces a large volume of fines, whereas in a neutral or tensile environment, unstable crack branching is responsible for a much smaller volume of fines. The boundary between the fine- and the intermediate-size fragments scales as the average grain size of the material. The ultimate goal is to develop a blasting process that minimizes the fines, which, in mining, are both an environmental hazard and useless for further processing.

中文翻译：

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在受压裂纹的动态传播过程中产生细小碎片

在非均质和脆性颗粒介质中由内部压力驱动的裂纹的高分辨率数值模拟产生的碎片尺寸分布具有与细碎和中等尺寸碎片区域中的砂浆和岩石喷砂圆柱体实验相同的特征。为了模拟例如在采矿业中使用的大规模爆炸，裂纹在处于压缩，中性或张力下的介质中传播。在压缩环境中，剪切断裂会产生大量的细粉，而在中性或拉伸环境中，不稳定的裂纹分支会导致较小的细粉量。细颗粒和中颗粒之间的边界随材料的平均晶粒尺寸而变化。最终目的是开发一种能够最大程度地减少罚款的喷砂工艺，