【摘要】 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。更多还原

【Abstract】 Using molecular dynamics method with S-W potential,we have studied of the propagation behaviors of the cracks in single crystal silicon,which the initiative crack front directions along[100],[110]and[111]re- spectively.The results showed that,ring-like structures were formed near the crack tip at low temperature,as the temperature increasing,the mother-daughter cracks was observed during the simulation.However,for the crack with the front direction of[111],the orientation effect appeared obviously while the tip became wider and wider.更多还原