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螺型位错偶极子与界面钝裂纹的干涉效应
引用本文:徐政坤,宋豪鹏.螺型位错偶极子与界面钝裂纹的干涉效应[J].应用力学学报,2011,28(1).
作者姓名:徐政坤  宋豪鹏
作者单位:1. 张家界航空工业职业技术学院,427000,张家界
2. 湖南人学,410082,长沙
摘    要:研究了螺型位错偶极子与界面钝裂纹的干涉效应.应用保角变换技术,得到了复势函数与应力场的封闭解析解,讨论了位错偶极子方位、臂长及裂纹钝化程度对位错偶板子屏蔽效应和发射条件的影响.结果表明,与单个螺型位错不同,螺型位错偶极子与x轴夹角在一定范围内时才可以降低界面钝裂纹尖端的应力强度因子(屏蔽效应),屏蔽效应随偶板子臂长的增大而增强,随裂纹钝化程度的增大而增强,屏蔽区域也随裂纹钝化程度的增大而增大;位错偶极子发射所需的临界无穷远加载随偶极子臂长的增加而减小,随位错方位角及裂纹钝化程度的增加而增大;最可能的位错偶极子发射角度为0.螺型位错偶极子的发射比单个螺型位错的发射要困难.本文解答的特殊情况与相关文献给出的解答一致.

关 键 词:螺型位错偶极子  界面钝裂纹  保角变换  屏蔽效应  发射条件

The interaction between a screw dislocation dipole and an interfacial blunt crack
Xu Zhengkun,Song Haopeng.The interaction between a screw dislocation dipole and an interfacial blunt crack[J].Chinese Journal of Applied Mechanics,2011,28(1).
Authors:Xu Zhengkun  Song Haopeng
Institution:Xu Zhengkun1 Song Haopeng 2(Zhangjiajie Institute of Aeronautical Engineering,427000,Zhangjiajie,China)1(College of Mechanics and Aerospace,Hunan Univ,410082,Changsha,China)2
Abstract:The interaction between a screw dislocation dipole and an interfacial blunt crack is dealt with in this paper.Utilizing the conformal mapping technique,the closed-form solutions are derived for complex potentials and stress fields due to a screw dislocation dipole located near the interfacial blunt crack.The stress intensity factor on the crack tip and the critical stress intensity factor for dislocation dipole emission are also calculated.The influence of the orientation and length of the dislocation dipol...
Keywords:screw dislocation dipole  interfacial blunt crack  conformal mapping  shielding effect  emission criterion    
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