非局部弹性中双相介质螺位错的表面位错模型

The Surface Dislocation Model for Screw Dislocation of Bi--Medium in Non--local Elasticity

本文,用表面位错模型分析了双相介质中螺位错的非局部应力场.得到了两种特殊情况的螺位错非局部应力场的解析表达式.计算了由于界面存在作用在螺位错上的力.消除了所有经典解的奇异性,估计了在双相介质中形成一个螺位错所需的临分切应力和由于界面存在作用在螺位错上力的极大值.

In this paper, the surface dislocation model is used to obtain a methodto solve the non-local stresses of screw dislocation in a bi-medium. Theexact solution of non-local stresses of screw dislocation under two particularcases and the force acting on screw dislocation due to existing interfaceare given. All classical singularities are eliminated. Estimates are providedfor the crtical shear stress which will produce a single disocation and forthe maximum force which acts on the screw dislocation due to existinginterface.