不同温度下的乙烯-三氟氯乙烯共聚物薄膜单轴拉伸试验

doi:10.16183/j.cnki.jsjtu.2019.317

上海交通大学学报 ›› 2021, Vol. 55 ›› Issue (4): 387-393.doi: 10.16183/j.cnki.jsjtu.2019.317

所属专题：《上海交通大学学报》2021年“土木建筑工程”专题；《上海交通大学学报》2021年12期专题汇总专辑

不同温度下的乙烯-三氟氯乙烯共聚物薄膜单轴拉伸试验

刘昶江, 赵兵, 陈务军()

上海交通大学空间结构研究中心,上海 200240

收稿日期:2019-10-30 出版日期:2021-04-28 发布日期:2021-04-30
通讯作者: 陈务军 E-mail:cwj@sjtu.edu.cn
作者简介:刘昶江(1994-),男,河北省邯郸市人,硕士生,主要研究方向为膜结构、空间结构
基金资助:
国家自然科学基金(51708345);国家自然科学基金(51778362);国家自然科学基金(51478264);中国博士后科学基金(2017M610253)

Test of Uniaxial Tensile Mechanical Properties of ECTFE Foils at Various Temperatures

LIU Changjiang, ZHAO Bing, CHEN Wujun()

Space Structures Research Centre, Shanghai Jiao Tong University, Shanghai 200240, China

Received:2019-10-30 Online:2021-04-28 Published:2021-04-30
Contact: CHEN Wujun E-mail:cwj@sjtu.edu.cn

摘要/Abstract

摘要：

对厚度为250 μm的乙烯-三氟氯乙烯共聚物(ECTFE) 薄膜进行了单轴拉伸试验,考虑了不同的低-高温度 (分别为-50、-40、-30、-20、-10、0、10、20、30、40、50、60、70及80 ℃) 效应,试件截取方向为机器方向.得到了ECTFE薄膜在不同温度下的拉伸应力-应变曲线,通过分析得到了弹性模量、屈服强度、屈服应变、冷拉应力、抗拉强度、断裂延伸率等力学参数及其随温度的变化规律.结果表明:随着温度的降低,应力-应变曲线整体向上抬升,屈服强度、拉伸强度、冷拉应力和弹性模量均增大,断裂延伸率和韧性均减小.在不同温度(-50~80 ℃)下,弹性模量的差值可达到93%,屈服强度的差值可达到89%,温度变化对ECTFE薄膜力学性能的影响显著.得出了主要力学参数和温度变化的拟合公式,可用于判断ECTFE薄膜在不同温度下的力学性能.

关键词: 乙烯-三氟氯乙烯共聚物薄膜, 低-高温度环境, 单轴拉伸试验, 弹性模量, 屈服强度

Abstract:

Uniaxial tensile tests of ethylene-chloro-tri-fluoro-ethylene (ECTFE) foils were conducted at a thickness of 250 μm and various low and high temperatures (-50, -40, -30, -20, -10, 0, 10, 20, 30, 40, 50, 60, 70, and 80 ℃). The specimens were fabricated according to the machine direction (MD). The tensile stress-strain curves of the foils at various temperatures were obtained. According to the variation discipline with temperature, several parameters such as elastic modulus, yield stress, yield strain, cold drawing stress, tensile strength, and tensile strain at break were subsequently analyzed and calculated. The results show that with the elevation of the stress-strain curves, the yield strength, tensile strength, cold drawing stress, and elastic modulus increase, but the strain at break and toughness decrease when the temperature decreases. At a wide range of temperatures from -50 ℃ to 80 ℃, the difference of elastic modulus can increase up to 93%, with a yield stress of 89%, which reflects the great sensitivity of ECTFE to temperatures. The fitting formulas of main mechanical parameters are also obtained, which can be used to predict the mechanical properties of ECTFE foils at various temperatures.

Key words: ethylene-chloro-tri-fluoro-ethylene (ECTFE) foils, low and high temperature environment, uniaxial tensile test, elastic modulus, yield stress

中图分类号:

TU502

刘昶江, 赵兵, 陈务军. 不同温度下的乙烯-三氟氯乙烯共聚物薄膜单轴拉伸试验[J]. 上海交通大学学报, 2021, 55(4): 387-393.

LIU Changjiang, ZHAO Bing, CHEN Wujun. Test of Uniaxial Tensile Mechanical Properties of ECTFE Foils at Various Temperatures[J]. Journal of Shanghai Jiao Tong University, 2021, 55(4): 387-393.

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性能参数	ECTFE	ETFE
屈服强度/MPa	29	14~22
拉伸强度/MPa	52	44
断裂伸长率/%	280~330	150~360
切线弹性模量/MPa	1150~1380	810~900
比重/(g·mL^-1)	1.68	1.7~1.77
灰度/%	1	3~10
泊松比	0.46	0.43~0.45
邵氏硬度	75	67
耐磨性	0.3	7.6
熔点/℃	220~227	253~265
最高连续使用温度/℃	150	150
热膨胀系数/℃	8×10^-5	1×10^-4
氧指数/%	52	30~36
热传导率/(W·m^-1·K^-1)	0.15	0.2
使用年限/a	>25	>25

不同温度下的乙烯-三氟氯乙烯共聚物薄膜单轴拉伸试验

Test of Uniaxial Tensile Mechanical Properties of ECTFE Foils at Various Temperatures

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