Crack front propagation by kink formation
Crack front propagation by kink formation
复制标题
通过扭结形成的裂纹前沿扩展
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
H. Trebin
中科院分区：
文献类型：
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作者：
F. Rösch;H. Trebin
三维脆性固体的断裂产生二维表面，二维表面在一维裂纹前缘后面形成。本文提出了在（111）解理面上的准静态裂纹是通过扭结对形成的，并用Stillinger-Weber势的反应路径分析证明了这一点。在这里，我们证明了扭对机制更为普遍：我们还在复杂金属合金C15 NbCr2 Friauf-Laves相的分子动力学模拟中观察到它，在那里我们使用了精心选择的嵌入原子方法电位。数值实验表明，在任何脆性材料中，扭结的形成都是裂纹扩展的必要条件。
The fracture of a three-dimensional brittle solid generates two-dimensional surfaces, which are formed behind a one-dimensional crack front. For quasi-static cracks on a (111) cleavage plane in silicon front propagation by kink-pair formation was proposed and proven by a reaction pathway analysis with Stillinger-Weber potentials. Here, we demonstrate that the kink-pair mechanism is much more general: we also observe it in molecular-dynamics simulations of a complex metallic alloy, the C15 NbCr2 Friauf-Laves phase, where we applied carefully selected embedded-atom-method potentials. The numerical experiments highlight that kink formation is essential for crack propagation in any brittle material.