【摘要】 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(0.000 6、0.006、0.06、0.12 s-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.更多还原

【Abstract】 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.更多还原