ELECTROELASTIC INTERACTION BETWEEN A PIEZOELECTRIC SCREW DISLOCATION AND A CONFOCAL CRACK IN ELLIPTICAL INHOMOGENEITY

摘要：

The electroelastic interaction between a piezoelectric screw dislocation,which is located inside either the inhomogeneity or the matrix,and an elliptical inhomogeneity which contains a confocal crack in piezoelectric solids is dealt with.Explicit series solutions of complex potentials are given when the screw dislocation is located inside either the inhomogeneity or the matrix.The image force acting on the screw dislocation,stress intensity factor,electrical displacement intensity factor and critical stress intensity factor for dislocation emission are derived.As a result,numerical analysis and discussion show that the screw dislocation can retard the crack propagation only when it is located in the certain region.Dislocation emission is significant influenced by the electroelastic mismatch between two materials,a softer matrix makes the dislocation emission easier and a harder matrix makes the dislocation emission more difficult.

关键词： confocal crack screw dislocation stress intensity factor image force dislocation emission

作者: Y.W.Liu H.P.Song Q.H.Fang

作者单位: College of Mechanics and Aerospace,Hunan University,Changsha,Hunan410082,China

会议类型: 国际会议

会议名称: 第二届国际非均质材料力学会议(The Second International Conference on Heterogeneous Material Mechanics)

会议地点: 安徽黄山

会议语种:英文

页码: 1667-1672

在线出版日期: 2008-06-03（万方平台首次上网日期，不代表论文的发表时间）