Simulating materials failure by using up to one billion atoms and the world's fastest computer: Brittle fracture
Simulating materials failure by using up to one billion atoms and the world's fastest computer: Brittle fracture
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DOI：
10.1073/pnas.062012699
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发表时间：
2002-04-30
影响因子：
11.1
通讯作者：
Seager, M
中科院分区：
文献类型：
--
作者：
Abraham, FF;Walkup, R;Seager, M
我们描述了在劳伦斯利弗莫尔国家实验室的 12 teraflop ASCI（加速战略计算计划）白色计算机上执行的两个大规模材料失效原子模拟项目中的第一个项目。这是对快速脆性断裂中裂纹扩展的数百万原子模拟研究，其中裂纹的传播速度超过了声速。我们的发现集中在双层固体上，该固体在大应变下表现得像软（线性）材料和硬（非线性）材料之间的界面裂纹。我们验证了裂纹行为由局部（非线性）波速主导，该波速可能超过固体的传统声速。
We describe the first of two large-scale atomic simulation projects on materials failure performed on the 12-teraflop ASCI (Accelerated Strategic Computing Initiative) White computer at Lawrence Livermore National Laboratory. This is a multimillion-atom simulation study of crack propagation in rapid brittle fracture where the cracks travel faster than the speed of sound. Our finding centers on a bilayer solid that behaves under large strain like an interface crack between a soft (linear) material and a stiff (nonlinear) material. We verify that the crack behavior is dominated by the local (nonlinear) wave speeds, which can be in excess of the conventional sound speeds of a solid.