Experimental and modelling of constitutive equation of polycarbonate material

In this paper, according to the principle of building the constitutive model of polymer material, the one-dimensional structure of the ZWT material constitutive model is added to dashpot element in parallel, and in which strain rate and coefficient of viscosity is introduced and the nonlinear viscoelastic constitutive model of Polycarbonate material is achieved. Additionally, tensile test at low strain rate and Hopkinson test at high strain rate of polycarbonate material are carried out, and the change rule of yield strength of polycarbonate material is obtained both at high strain rate and low strain rate. According to the experimental data, the parameters of the constitutive model have been optimized and fitted using ant colony algorithm, and then the fitted results are compared with experimental results. The comparative results show that the improved ZWT constitutive model can reasonably represent the nonlinear characteristics of polycarbonate material at different strain rate.