汽车内饰聚碳酸酯膜片热压成型技术仿真及应用研究

Study on simulation and application of automotive interior polycarbonate film thermoforming technology

以汽车照明系统中集光、触、控为一体的智能表面聚碳酸酯(PC)膜片为研究对象,通过单向拉伸试验,获得聚碳酸酯在不同温度(23~140℃)和不同拉伸速度(5~500 mm·min-1)下的应力应变曲线。在此基础上,结合米泽斯屈服准则,对汽车膜片热压成型过程进行仿真模拟,以期提高膜片热压成型变形情况的模拟精度。最后,通过膜片热压成型实验,将实验样品的特征点的平面位置测量结果与仿真预测结果进行对比,结果显示,两者的位置偏差率被控制在8%以内,说明所建立的聚碳酸酯材料力学模型准确,膜片热压成型仿真模拟方法可靠。

This paper focuses on the smart surface polycarbonate(PC) film integrating light, touch and control in the automotive lighting system. Through the uniaxial tensile test, the strain-stress curve of PC at different temperatures(23~140 ℃) and tensile speed(5~500 mm·min-1) was obtained. On such a basis, combined with the Von Mises yield criterion, the thermoforming process of the automobile film was simulated, with the expectation of enhancing the accuracy of simulation of film thermoforming deformation. After the film thermoforming experiment, the measured plane position of feature points of experimental samples was compared with the results of the simulation. According to the results, the position deviation is controlled within 8%, which verifies the accuracy of the PC mechanical model established herein and the reliability of the method for film thermoforming simulation.