Interaction of a screw dislocation with an interfacial edge crack in a two-phase piezoelectric material

The interaction of a screw dislocation with an interfacial edge crack in a two-phase piezoelectric medium is investigated. Closed-form solutions of the elastic and electrical fields induced by the screw dislocation are derived using the conformal mapping method in conjunction with the image principle. Based on the electroelastic fields derived, the stress and electric displacement intensity factors, the image force acting on the dislocation are given explicitly. We find that the stress and electric displacement intensity factors depend on the effective electroelastic material constants. In the case where one of two phases is purely elastic, the stress intensity factor and image force are plotted to illustrate the influences of electromechanical coupling effect, the position of the dislocation and the material properties on the interaction mechanism. The project supported by the Doctoral Foundation of Hebei Province (B2003113)     

压电螺位错与椭圆夹杂的电弹相互作用

研究了压电材料中压电螺位错与椭圆夹杂的电弹相互作用.基于扰动概念和级数展开方法,推导了基体和夹杂的弹性场和电场,在此基础上给出了作用于位错上像力的表达式.通过分析基体与夹杂的相对刚度和机电耦合强弱对像力的影响,得到了新的相互作用机理.     

点简支正交各向异性矩形薄板弯曲的精确解

本文利用迭加原理,给出了点简支正交各向异性短形薄板弯曲问题的封闭的级数式解答.简支点的位置和横向载荷的分布均可任意.用本文的级数解给出的算例与以往的数值解是十分一致的.     

初始几何缺陷对薄圆环板弹塑性稳定性的影响

本文应用Neale关于增量边界值问题的广义变分原理,考察初始几何缺陷对薄圆环板弹塑性屈曲临界载荷的影响,计算表明,只要在J₂增量理论的解中计入初始几何缺陷的影响,所得的结果与几何理想圆环板在塑性形变理论下的分支性屈曲载荷十分接近.     

含椭圆夹杂二维各向异性电磁弹性介质的耦合问题

研究了无限大二维各向异性电磁弹性固体的椭圆夹杂问题.基于广义Stroh方法、保角变换和扰动概念,得到了基体和夹杂内电场、磁场和弹性场的封闭解.本文结果可用于研究电磁弹性复合材料的有效性能.     

Coupled fields of two-dimensional anisotropic magneto-electro-elastic solids with an elliptical inclusion

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On the electroelastic interaction of a piezoelectric screw dislocation with an elliptical inclusion in piezoelectric materials

ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｉｎｔｅｒａｃｔｉｏｎｏｆｄｉｓｌｏｃａｔｉｏｎｓｗｉｔｈｉｎｃｌｕｓｉｏｎｓｉｓｏｆｃｏｎｓｉｄｅｒａｂｌｅｉｍｐｏｒｔａｎｃｅｆｏｒｕｎｄｅｒｓｔａｎｄｉｎｇｔｈｅｐｈｙｓｉｃａｌｂｅｈａｖｉｏｒｏｆｍａｔｅｒｉａｌｓ.Ｓｕｃｈｓｔｕｄｉｅｓｃａｎｐｒｏｖｉｄｅｄｉｎｆｏｒｍａｔｉｏｎｃｏｎｃｅｒｎｉｎｇｃｅｒｔａｉｎｓｔｒｅｎｇｔｈｅｎｉｎｇｏｒｈａｒｄｅｎｉｎｇｍｅｃｈａｎｉｓｍｓｉｎｎｕｍｂｅｒｏｆｔｒａｄｉｔｉｏｎａｌａｎｄｃｏｍｐｏｓｉｔｅｍａｔｅｒｉ…     

An exact solution for the bending of point-supported orthotropic rectangular thin plates

A closed series solution is proposed for the bending of point-supported orthotropic rectangular thin plates. The positions of support points and the distribution of transverse load are arbitrary. If the number of simply supported points gradually increases the solution can infinitely approach to Navier's solution. For the square plate simply supported on the middle of each edge and free at each corner, the results are very close to the numerical solutions in the past.     

Effect of initial imperfections in geometry on the elastic-plastic stability of a thin annular plate

In this paper,Neale’S generalized variational principle aboutincremental boundarg-value problems is utilized to study theeffect of initial imperfections in geometry on tbe criticalloads of elasticoplastic buckling of thin annular plates.Thecalculations show that.if the effect of initial imperfectionsin geometrg is taken into account in the solutions by J_2 in-cremental theorg.the results are very close to the bifurca-tional buckling loads of the perfect annular Plates accordingto the plastic deformation theorg.