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采用基于Stillinger-Weber作用势的分子动力学方法研究了单晶硅预制初裂纹前缘方向分别为[100]、[110]、[111]晶向的裂纹扩展行为.模拟结果表明:低温时裂纹尖端形成新的环状结构,温度逐渐升高后,出现母-子裂纹传播机制,裂纹前缘方向为[111]晶向的初裂纹扩展呈现出明显的取向效应.

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