Crack Propagation in Quasicrystals
Crack Propagation in Quasicrystals
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DOI：
10.1103/physrevlett.81.3163
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发表时间：
1998-04
影响因子：
8.6
通讯作者：
R. Mikulla;J. Stadler;F. Krul;H. Trebin;P. Gumbsch
中科院分区：
文献类型：
--
作者：
R. Mikulla;J. Stadler;F. Krul;H. Trebin;P. Gumbsch
研究了二维十次模型准晶中的裂纹扩展。模拟揭示了高度协调的原子环境作为位错运动和裂纹扩展的结构固有障碍的主导作用。对于某些过载，这些障碍物和晶体的准周期性质导致特定的裂纹扩展机制：裂纹尖端发射位错，随后是相子壁，材料沿其沿着打开。
Crack propagation is studied in a two dimensional decagonal model quasicrystal. The simulations reveal the dominating role of highly coordinated atomic environments as structure intrinsic obstacles for both dislocation motion and crack propagation. For certain overloads, these obstacles and the quasiperiodic nature of the crystal result in a specific crack propagation mechanism: The crack tip emits a dislocation followed by a phason wall, along which the material opens up.