压痕黏性颗粒介质的裂纹模式
The crack pattern of indented cohesive granular media
AI总结：
本文通过准静态圆柱压入实验结合三维X射线显微断层扫描，研究湿颗粒堆的径向裂纹形态，并揭示剪切剪胀与裂纹萌生的关联。
摘要：
黏性颗粒材料（如湿沙）在应力作用下屈服前会保持其形状。这种类固体行为与弹性相关。随着载荷增加，材料通常会发生流动。然而，黏性材料也可能产生裂纹，类似于在脆性材料中观察到的裂纹。本研究探讨了颗粒堆压痕过程中裂纹的形成。将一个实心圆柱形压头以准静态方式压入湿颗粒介质中，导致径向裂纹出现。这些裂纹类似于在脆性固体材料中观察到的I型裂纹。我们通过直接观察和三维X射线显微断层扫描来表征裂纹模式。值得注意的是，我们强调了材料在剪切过程中的剪胀与裂纹出现之间的相关性。
英文摘要：
Cohesive granular materials, like wet sand, retain their shape before yielding under stress. This solid-like behavior is associated with elasticity. As the loading increases, the material typically flows. However, cohesive materials can also develop cracks, similar to those observed in brittle materials. This study explores the formation of cracks during the indentation of a granular pile. A solid cylindrical indenter is pushed quasi-statically into the wet granular medium, causing radial cracks to appear. These cracks resemble mode I cracks observed in brittle solid materials. We characterize the crack pattern through direct observation and three-dimensional X-ray micro-tomography. Notably, we highlight the correlation between the dilation of the material during shearing and the appearance of cracks.
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