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工程力学  2013 

力、电、热作用下晶内微裂纹的演化

DOI: 1000-4750(2013)06-0006-05, PP. 6-10

Keywords: 微裂纹演化,有限元,表面扩散,电场,应力场,热应力,微裂纹演化,有限元,表面扩散,电场,应力场,热应力

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Abstract:

基于表面扩散的经典理论及其弱解描述,对曲率、力、电和热共同作用下金属材料内部晶内微裂纹的演化进行了有限元分析。详细讨论了微裂纹初始形态、电场大小、应力大小和电致生热对微裂纹演化的影响。结果表明:对于形态比为的微裂纹,存在一临界电场值和临界应力值。当且时,微裂纹逐渐圆柱化;当或时,微裂纹分节为上、下或左、右两个小裂纹。热应力可减小的值,即有利于微裂纹分节。同时热应力可加快微裂纹的漂移速度,缩短分节时间。

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