Rheology elasticity determined by deformation of stretchable molecular trains

摘要

The average stretching direction, local rotation angular, and stretching ratio parameters of molecular wains were used to express the rheology deformation. Based on this micro geometrical deformation, the macro deformation of medium was expressed.Then, using intrinsic elasticity concept, the stress-strain relation was obtained. In this theoretic formulation, the response functions of extension ratio and rotation angular were used to express the theology feature of medium. For medium composed by incompressible molecular trains, the local rotation angular divides rheology deformation into three kinds: viscoelastic deformation orelasticity enhancement, viscoplastie deformation or elasticity degenerate and constant elasticity range. These results explain the experimental features of rheology deformation well.