论文标题
脆性固体中的移动裂缝如何选择他们的路径
How moving cracks in brittle solids choose their path
论文作者
论文摘要
虽然我们从根本上了解完美（同质）材料中脆性固体中“简单”裂纹的动态，但我们不了解如何确定移动裂纹的路径。我们实验研究了强烈的裂纹，这些裂纹在脆性材料中传播了其限制速度的10-95％。这些裂纹是通过与稀疏植入的缺陷的相互作用或通过无缺陷培养基中的固有振荡不稳定的相互作用来偏转的。裂纹尖端周围应变场的致密高速测量表明，裂纹路径受到最大应变能密度的方向的控制。这种根本重要的结果可以用于直接或指导运行裂纹。
While we fundamentally understand the dynamics of 'simple' cracks propagating in brittle solids within perfect (homogeneous) materials, we do not understand how paths of moving cracks are determined. We experimentally study strongly perturbed cracks that propagate between 10-95\% of their limiting velocity within a brittle material. These cracks are deflected by either interaction with sparsely implanted defects or via an intrinsic oscillatory instability in defect-free media. Dense, high-speed measurements of the strain fields surrounding the crack tips reveal that crack paths are governed by the direction of maximal strain energy density. This fundamentally important result may be utilized to either direct or guide running cracks.
