聚碳酸酯板材中、低温本构模型的建立

The establishment of the constitutive equation of polycarbonate at low and medium temperature

通过拉伸实验及参数辨识建立了聚碳酸酯中低温DSGZ本构方程（-50℃～60℃），研究了聚碳酸酯板材在不同温度（-50、-20、0、20、60℃）及应变率（0．0006、0．006、0．06、0．12s^-1）下的力学性能．研究结果表明：普通DSGZ模型无法确切描述聚碳酸酯应变软化行为．在此基础上，引入了修正的DSGZ模型，结果表明：修正DSGZ模型可更加有效地描述聚碳酸酯板材中、低温的力学行为．

This paper studied the deformation behavior of Polycarbonate （PC） sheet at temperature of -50, -20, 0, 20, 60 ℃ and strain rate of 0. 0006, 0. 006, 0.06, 0. 12 s-1, respectively. Based on tensile tests and parameter identification, a modified DSGZ constitution model was developed to describe PC mechanical properties at the temperature from -50℃ to 60℃ , and the results show that the model can give much better description of PC mechanical deformation at low and medium temperature.