Abstract:

As the classical mechanical model can not correctly depict the viscoelastic behaviors of polymer,a new mechanical model which can characterize various viscoelastic behaviors is proposed.This model can corectly de-scribe the wriggle-change and stress relaxation behaviors of polymer.Then,with the help of a two spring-two pistonsystem (the rigidities and the viscidities are respectively different)and by employing the principles of rheology and elasticity dynamics,a novel physical model and its coresponding mathematical expressions for polymer viscoelasti-city are obtained.The viscitic flow characteristics of polymer under a vibrating load were finally discussed,which leads to the following conclusions:(1)the viscositic flow of polymer is directly propo~ional to the amplitude of the swing;(2)there is an optimal~equency,at which its effect on the viscositic flow of polymer is the greatest.

Key words: polymer, mechanical model, viscoelasticity