| 摘要: |
| 在20~-100℃下进行ETFE（乙烯四氟乙烯共聚物）薄膜单向拉伸性能试验.结果表明：当温度降低至-40℃以下时，ETFE薄膜应力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，破断延伸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-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ETFE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 |
| DOI：10.3969/j.issn.1007 9629.2013.04.031 |
| 分类号: |
| 基金项目:教育部博士点基金资助项目(20110072110036) |
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| Uniaxial Tensile Properties of ETFE Film at Low Temperature Condition |
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CUI Jia chun, YANG Lian ping, WU Ming er
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Department of Building Engineering, Tongji University, Shanghai 200092, China
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| Abstract: |
| Uniaxial tensile properties tests of ETFE film were carried out from 20℃ to -100℃.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℃） while it is two straight lines at normal temperature（20℃）. 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 linear increase with decreasing temperature. The breaking elongation of ETFE film shows a nearly linear decrease with decreasing temperature. The strain at the second yield point changes a little with decreasing temperature. Compared with that at normal temperature(20℃), the tensile strength of ETFE film has improved greatly and the ductility of ETFE film has decreased obviously at low temperature. When temperature changes from 20℃ to -100℃,the change amplitude 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 |
