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中文摘要：
采用分步位移加载和弹塑性材料模型，在应力应变曲线及材料基本参数的基础上，对PTFE薄膜横向拉伸过程进行了实验研究和有限元分析，得到了均匀横向拉伸和横向拉伸过程中薄膜的应力和位移变形分布状态及规律。实验和模拟结果表明，由于PTFE薄膜在低应力下易发生塑性变形，在横向拉伸过程中存在明显的应力和位移分布不匀，并导致薄膜在面内发生弓曲变形。研究结果对通过扩幅实现双向拉伸薄膜的非均匀变形控制具有参考价值。
英文摘要：
The deformation behavior of equally transverse stretching and consecutively tenter transverse stretching of polytetrafluoroethylene （PTFE） membrane after being longitudinally stretched were experimentally measured and simulated with finite element analysis （FEA）, and the stress and displacement distributions of the PTFE membrane were obtained based on the FEA analysis. The results showed that there were obvious non-uniform deformations in the transversely stretched PTFE membrane due to the plastic deformation at small strain levels, which also led to the bowing phenomenon.
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