PET膜片压力胀型失效试验与有限元分析

摘要

膜片在压力胀型过程中失效形式主要为起皱和破裂。以PET膜片为研究对象搭建压力胀型试验台，获得膜片破裂时失效压力及失效位置。通过单向拉伸试验获得PET膜片室温下的应力-应变曲线，根据该曲线并利用Fortran语言编写程序来求解PET膜片三参数模型，并将此程序导入ABAQUS软件进行有限元分析。通过自由成型仿真与试验结果对比分析，表明仿真模型能准确反映PET膜片压力胀型成型性能。通过仿真PET膜片成型过程中的应力和厚度分布，分析试验中膜片出现的失效现象，为PET膜片压力胀型的工艺方案和结构设计提供理论指导。%The main failure mode of the film forming in the pressure bulging process is wrinkle and burst. By constructing pressure bulging study object of PET film,build up test bench to acquire burst pressure and burst position when the film is burst. By uniax-ial tensile test,obtain the stress-strain curve of the PET film at room temperature,solve the parameters of three-parameter model according to the curve,using the Fortran language to write program of the PET film three-parameter model,import the program in-to the ABAQUS software for finite element analysis. By free bulging simulation and experimental contrast analysis,the three-pa-rameter model could accurately reflect the bulging forming property of PET film. Then through finite element simulation,analyzing failure occurred in the experiment by stress & thickness distribution in the PET forming process,provide theoretical guidance for process scheme and structure design of PET film pressure bulging.