裂面形貌扰动对晶内微裂纹演变影响的有限元分析

来源期刊:中南大学学报(自然科学版)2008年第4期

论文作者:黄佩珍 王远鹏

文章页码:760 - 764

关键词:晶内微裂纹;表面扩散;有限单元法;裂面形貌扰动;形貌演变;

Key words:intragranular microcracks; surface diffusion; finite element method; surface perturbation; shape evolutions

摘    要:

根据表面扩散控制下物质迁移规律,建立有限单元法,对裂面形貌扰动下二维微裂纹演变过程进行数值模拟。结果表明:裂尖的几何形状对微裂纹圆柱化时间起决定性作用;在裂面形貌扰动振幅不变的情况下,扰动频率越高,其对裂腔分节临界形态比的影响越小,且波数为奇数的微裂纹更容易分节;振幅对裂腔分节起阻碍作用;裂面形貌扰动频率越小,振幅对裂腔分节临界形态比的影响越显著。

Abstract: Based on the theory of surface diffusion, a finite element method was developed to simulate shape evolutions of two-dimensional microcracks with surface perturbation. The results show that the cylinderization time depends sensitively on the initial morphology of the microcrack tip. When the amplitude of the perturbation is given, the frequency effect on the critical aspect ratio is weakened with the increase of perturbation. The microcrack is easy to split into two parts when the number is uneven, while the splitting process is interfered with by the amplitude. When the frequency is small, the amplitude has an obvious effect on the critical aspect ratio.

基金信息:国家自然科学基金资助项目
南京航空航天大学引进人才科研基金资助项目

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