ETFE薄膜低温单向拉伸性能.pdf

学兔w第16卷第4期
建筑材料学报
Vol. 16, N
2013年8月
JOURNAL OF BUILDING MATERIALS
Aug.,2013
文章编号:1007-9629(2013)04-0725-05
ETFE薄膜低温单向拉伸性能
崔家春2,杨联萍2,吴明儿
(1.同济大学建筑工程系,上海200092;2.上海现代建筑设计集闭,上海200041)
摘要:在20~-100℃下进行ETFE(乙烯一四氟乙烯共聚物)薄膜单向拉伸性能试验,結果表明:
当温度降低至一40℃以下时,ETFE薄膜应力一应变曲线在强化前由明显的两折线几乎变成连续
的曲线.随着温度的降低,ETFE薄膜第一屈服点应力、第一屈服点应变、第二屈服点应力和抗拉强
度均呈近似线性升高趋势,破断延仲率呈近似线性降低趋势,而第二屈服点应变变化幅度不大.与
常温(20℃)相比,低温下ETFE薄膜的抗拉强度有较大提高,而延性则明显降低、在温度从20℃
降低至一100℃过程中,ETFE薄膜割线模量变化幅度在10%以内,因此工程设计中可以忽略低温
温度变化对FTFE薄膜割线模量的影响
关键词:ETFE薄膜;单向拉伸性能;屈服应力;低温性能
中图分类号:TQ325.4;TU5021.6文献标志码:Adoi:10.3969/.issn.1007-9629.2013.04.031
Uniaxial Tensile Properties of ETFE Film at Low-temperature Condition
CUI Jia-chunl,, YANG Lian ping1,2, WU Ming er
(1. Department of Building Engineering, Tongji University, Shanghai 200092, China:
2. Shanghai Xiandai Architectural Design Group, Shanghai 200041, China
Abstract: Uniaxial tensile properties tests of ETFE film were carricd out from 20 C to-100 C. The test
results show that the stress-strain curve of ETFE film is nearly a continuous curve before the second yield
point at low temperature(<-40 C) while it is two straight lines at normal temperature(20 C). The
stress at the first yield point, the strain at the first yield point, the stress at the second yield point and the
tensile strength of ETFE film show a nearly lincar increase with decrcasing temperature. The breaking e
longation of ETFE film shows a nearly linear decrease with decreasing temperature. The strain at the sec
ond yield point changes a little with decreasing temperature. Compared with that at normal temperature
(20 C), the tensile strength of ETFE film has improved greatly and the ductility of ETFE film has de-
creased obviously at low-temperature. When temperature changes from 20C to-100c, the change am
plitude of secant elastic modulus of ETFE film is less than 10% and can be ignored for engineering design
Key words: ETFE film; uniaxial tensile property; yield stress; low-temperature property
ETFE( ethylene tetra fluoro ethylene)薄膜因吴明儿等对3种厚度的ETFE薄膜进行了常温单
其轻质、耐腐、高透光率、强建筑表现力等特点而越向拉伸性能试验,并给出了常温下ETFE薄膜的屈
来越广泛地应用于建筑领域.建筑用ETFE薄膜厚服强度、屈服应变、抗拉强度和抗拉应变等;Ie
度为50~300gm,抗拉强度为40~60MPa,破断延等]在23~100℃下对ETFE薄膜进行单向拉伸性
伸率为300%~400%.近几年,国内外研究人员对能试验,并指出随着温度的升高,ETFE薄膜屈服强
ETFE薄膜的拉伸性能进行了较多研究,例如,度、抗拉强度、破断延伸率、切线模量和割线模量均
收稿日期:201208-01;修订日期:2012-09-10
基金项目:教育部博土点基金资助项目(20110072110036
第一作者:崔家春(1982-),男,安徽阜阳人,同济大学博士生.E-mail:ch_cui@163.com