裂纹尖端塑性区和无位错区的微观模拟

金属学报, 2004, 40(2): 159-162. doi: 10.3321/j.issn:0412-1961.2004.02.009

裂纹尖端塑性区和无位错区的微观模拟

钱才富 ^1, , 姜忠军 ^2, , 陈平 ^3, , 段成红 ^4, , 崔文勇 ^5,

1.北京化工大学过程装备与控制工程系,北京,100029

2.北京化工大学过程装备与控制工程系,北京,100029

3.北京化工大学过程装备与控制工程系,北京,100029

4.北京化工大学过程装备与控制工程系,北京,100029

5.北京化工大学过程装备与控制工程系,北京,100029

基金项目: 国家自然科学基金(10272020)

关键词：位错发射 , 裂纹 , 塑性区

Micro-Simulation of Crack Tip Plastic Zone and Dislocation-Free Zone

用细观断裂力学研究了刃型位错从Ⅰ型、Ⅱ型及Ⅰ+Ⅱ复合型裂纹尖端沿多个滑移面的发射以及裂纹周围无位错区和塑性区的形状和大小.结果表明,Ⅱ型裂纹塑性区形状和宏观断裂力学算出的塑性区形状有所不同,而Ⅰ型裂纹塑性区形状则类似;当外载荷相同时,Ⅱ型裂纹的塑性区比Ⅰ型裂纹的塑性区要大得多;复合型裂纹的塑性区形状和大小更接近Ⅱ型裂纹.各种裂纹尖端周围均存在无位错区,其形状与相应的塑性区相似.

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裂纹尖端塑性区和无位错区的微观模拟

Micro-Simulation of Crack Tip Plastic Zone and Dislocation-Free Zone

参考文献