| INTERACTION OF A DISLOCATION DIPOLE WITH A MODE III INTERFACE CRACK |
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| 作者姓名： | Jin Bo Fang Qihong Liu Youwen |
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| 作者单位： | Jin Bo (College of Civil Engineering，Hunan University，Changsha，410082，China) Fang Qihong Liu Youwen (College of Mechanics and Aerospace，Hunan University，Changsha，410082，China) |
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| 基金项目： | Project supported by the National Natural Science Foundation of China (No. 10472030). |
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| 摘 要： | Interaction between a screw dislocation dipole and a mode III interface crack is investigated. By using the complex variable method, the closed form solutions for complex potentials are obtained when a screw dislocation dipole lies inside a medium. The stress fields and the stress intensity factors at the tip of the interface crack produced by the screw dislocation dipole are given. The influence of the orientation, the dipole arm and the location of the screw dislocation dipole as well as the material mismatch on the stress intensity factors is discussed. The image force and the image torque acting on the screw dislocation dipole center are also calculated. The mechanical equilibrium position of the screw dislocation dipole is examined for various material property combinations and crack geometries. The results indicate that the shielding or anti-shielding effect on the stress intensity factor increases abruptly when the dislocation dipole approaches the tip of the crack. Additionally, the disturbation of the interface crack on the motion of the dislocation dipole is also significant.
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| 关 键 词： | 位错 偶极子 Ⅲ型界面裂纹 相互作用 |
| 收稿时间： | 2005-07-13 |
| 修稿时间： | 2006-11-08 |
INTERACTION OF A DISLOCATION DIPOLE WITH A MODE III INTERFACE CRACK |
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| Jin Bo Fang Qihong Liu Youwen.INTERACTION OF A DISLOCATION DIPOLE WITH A MODE III INTERFACE CRACK[J].Acta Mechanica Solida Sinica,2007,20(1):50-56. |
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| Authors: | Jin Bo Fang Qihong Liu Youwen |
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| Institution: | 1. College of Civil Engineering, Hunan University, Changsha, 410082, China;2. College of Mechanics and Aerospace, Hunan University, Changsha, 410082, China |
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| Abstract: | Interaction between a screw dislocation dipole and a mode III interface crack is investigated. By using the complex variable method, the closed form solutions for complex potentials are obtained when a screw dislocation dipole lies inside a medium. The stress fields and the stress intensity factors at the tip of the interface crack produced by the screw dislocation dipole are given. The influence of the orientation, the dipole arm and the location of the screw dislocation dipole as well as the material mismatch on the stress intensity factors is discussed. The image force and the image torque acting on the screw dislocation dipole center are also calculated. The mechanical equilibrium position of the screw dislocation dipole is examined for various material property combinations and crack geometries. The results indicate that the shielding or anti-shielding effect on the stress intensity factor increases abruptly when the dislocation dipole approaches the tip of the crack. Additionally, the disturbation of the interface crack on the motion of the dislocation dipole is also significant. |
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| Keywords: | dislocation dipole interface crack image force image torque |
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