高分子材料中的位错应力场及位错能量

THE DISLOCATION STRESS FIELDS AND DISLOCATION ENERGY IN POLYMER MATERIALS

用线粘弹性理论 ,求出了高分子材料中刃型位错。

There is a phenomenon of dislocation in polymeric materials which is similar to that in metallic materials. However few studies on the dislocation of polymeric materials have been made. Using Maxwell model, the knife edge and screw dislocation stress fields and dislocation energy of polymers are obtained in the frame of linear viscoelastic theory. The results indicate that there is only a time function difference between the dislocation stress field and dislocation energy of polymeric materials and those of metal materials. Therefore, the dilocation stress fields and dislocation energy of metals and polymers have the same space distributions. When t=0, there is a singularity, for δ (0)→0 at this time, with time prolonging, f(t ) or f 1( t ) arrive at zero rapidly, so the dislocation stress fields and dislocation energy in polymer will gradually disappear. These results adapt only Maxwell body which describes a kind of materials possessing the properties of instantaneous elasticity and simultaneous viscous flow.