| 摘要: |
| 对6组250μm厚乙烯四氟乙烯(ethylene tetrafluoroethylene， ETFE)薄膜进行了不同应力幅值单轴循环拉伸试验.利用自编MATLAB程序分析了试验所得应力应变曲线，得到了循环弹性模量、屈服应力、棘轮应变以及滞回环面积等力学性能参数；分别建立了循环弹性模量、棘轮应变和滞回环面积与循环次数的关系式.试验和分析结果表明：随着循环次数的增加，循环弹性模量、棘轮应变和滞回环面积的变化率逐渐减小，分别近似稳定于13，14，14次循环. |
| 关键词: 单轴循环拉伸试验 乙烯四氟乙烯（ETFE）薄膜 弹性模量 屈服应力 棘轮应变 滞回环面积 |
| DOI：103969/jissn1007 9629201501013 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51278299,51478264) |
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| Mechanical Properties of ETFE Foils under Uniaxial Cyclic Tensile Loading |
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HU Jianhui1, CHEN Wujun1, SUN Rui2, ZHAO Bing1, LUO Renjie2
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1.Space Structures Research Center, Shanghai Jiao Tong University, Shanghai 200030, China;2.School ofNaval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China
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| Abstract: |
| Uniaxial cyclic tensile tests on six groups of ethylene tetrafluoroethylene（ETFE） foil samples of 250μm thick were conducted. After analyzing the stress strain curves based on a newly developed MATLAB program, values of cyclic elastic modulus, yield stress, ratcheting strains and hysteresis loop area were obtained. Furthermore, the equations relating cyclic elastic modulus, ratcheting strain and hysteresis loop area to number of cycles were established. The experimental and analysis results show that change rates of cyclic elastic modulus, ratcheting strains and hysteresis loop area become low with number of cycles and reach approximately stable values at cycle 13, 14, 14. |
| Key words: uniaxial cyclic tensile test ethylene tetrafluoroethylene(ETFE） foil elastic modulus yield stress ratcheting strain hysteresis loop area |
