乙烯-四氟乙烯共聚物薄膜单向拉伸性能及黏塑性本构模型

发布时间：2018-06-28 10:48

  本文选题：乙烯四氟乙烯共聚物薄膜 + 拉伸性能　； 参考：《上海交通大学学报》2016年11期

【摘要】：对厚度为250μm的长条形ETFE(乙烯-四氟乙烯共聚物)薄膜试样进行了8种定速(拉伸速度由极慢的1mm/min到极快的500mm/min)单向拉伸试验,得到了相应的应力应变曲线、屈服强度、弹性模量等参数随拉伸速率的变化规律.结果表明:ETFE薄膜的屈服强度和屈服应变随拉伸速率的增加而增加;ETFE薄膜的切线、割线弹性模量,以及基于应变能和应变余能的等效弹性模量随拉伸速率的增加而增大,3种弹性模量之间的差值也随拉伸速率的增加而增大.对上述应力应变曲线进行分析,提出了ETFE膜材的黏塑性本构模型(Peirce模型),并在有限元分析软件ANSYS中进行了数值模拟,其结果与试验得出的应力应变曲线吻合较好.
[Abstract]:In this paper, the uniaxial tensile tests of the thin film samples of ethylene-tetrafluoroethylene copolymer (ETFE) with thickness of 250 渭 m have been carried out at eight constant speeds (from very slow 1mm/min to extremely fast 500mm/min). The corresponding stress-strain curves and yield strength have been obtained. The variation of elastic modulus and other parameters with tensile rate. The results show that the yield strength and yield strain increase with the increase of tensile rate. The difference between the equivalent elastic modulus based on strain energy and strain complementary energy increases with the increase of tensile rate, and the difference between the three elastic moduli increases with the increase of tensile rate. The above stress-strain curves are analyzed and the viscoplastic constitutive model (Peirce model) of ETFE membrane is put forward. The numerical simulation is carried out in the finite element analysis software ANSYS. The results are in good agreement with the stress-strain curves obtained from the test.
【作者单位】： 上海交通大学空间结构研究中心;
【基金】：国家自然科学基金(51478264,51278299)资助项目
【分类号】：TU38;TU59
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本文编号：2077743