ECTFE气枕充气过程的试验与模拟分析研究  

Experiments and numerical simulation of inflating process of ethylene-chloro-tri-fluoro-ethylene(ECTFE)cushion

作　　者：刘昶江 赵兵[1] 陈务军[1] LIU Chang-jiang;ZHAO Bing;CHEN Wu-jun(Space Structures Research Centre,Shanghai Jiao Tong University,Shanghai 2002A0,China)

机构地区：[1]上海交通大学空间结构研究中心,上海200240

出　　处：《空间结构》2021年第3期68-73,共6页Spatial Structures

基　　金：国家自然科学基金项目(51708345,51778362,51478264);中国博士后科学基金项目(2017M610253);博士后创新人才支持计划(BX201600104)。

摘　　要：基于250μm厚的ECTFE(乙烯-三氟氯乙烯共聚物,ethylene-chloro-tri-fluoro-ethylene)薄膜单轴拉伸试验,国内首次设计制作了一个边长1.0m的正六边形ECTFE气枕,进行了不同内压平面充气成形试验,通过三维摄影测量测定膜面几何,得到了膜面在不同内压下的变形.采用各向同性模型对气枕的充气成形过程进行了数值模拟,得到了膜面应力、应变和变形.试验和数值模拟结果对比表明:随着内压的增加,ECTFE气枕矢高逐渐增大;膜面应力最大值点分布在膜面中心区域,并向边界扩散;应变最大值点位于边界中部,并向膜面中心扩散.本文研究对ECTFE薄膜气枕应用具有参考价值.Based on the uniaxial tensile tests of ethylene-chloro-tri-fluoro-ethylene(ECTFE)foils with a thickness of 250μm,a 1.0 m edge length hexagon-shaped ECTFE cushion is firstly designed and fabricated,involving planar cutting and patterning.A series of inflation forming is subsequently conducted with various pressures.The geometry variation is measured with 3 D photogrammetry.The deforming distribution of the membrane surface under various internal pressures is obtained.According to isotropic elastic model,the air-inflating process of ECTFE cushion is numerically simulated.The stress,strain and deformation on the membrane surface are analyzed.Comparing the test results with simulation results,the ECTFE cushion elevates gradually as the internal pressure increases,which reflects that test results are in good agreement with simulation results.The maximum stress is located in the center of the foil region.The maximum strain is found in the middle of the boundary.The proposed work is proved to be a valuable guide to the application of ECTFE cushion structures.

关 键 词：乙烯-三氟氯乙烯共聚物(ECTFE)薄膜 气枕 平面裁切 充气成形 

分 类 号：TU353[建筑科学—结构工程]