中国物理B ›› 2013, Vol. 22 ›› Issue (1): 16201-016201.doi: 10.1088/1674-1056/22/1/016201
• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇 下一篇
宋豪鹏, 高存法
Song Hao-Peng (宋豪鹏), Gao Cun-Fa (高存法)
摘要: The model of a screw dislocation near a semi-infinite wedge crack tip inside a nano circular inclusion is proposed to investigate the shielding effect of nano inclusions acting on cracks. Utilizing the complex function method, the closed-form solutions of the stress fields in the matrix and the inclusion region are derived. The stress intensity factor, the image force, as well as the critical loads for dislocation emission are discussed in detail. The results show that the nano inclusion not only enhances the shielding effect exerted by the dislocation, but also provides shielding effect itself. Moreover, dislocations may be trapped in the nano inclusion even if the matrix is softer than the inclusion. This helps the dislocation shield crack, and reduces the dislocation density within the matrix.
中图分类号: (Fracture)