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首页> 外文期刊>Journal of Applied Polymer Science >Linear thermoelastic characterization of anisotropic poly(ethylene terephthalate) films
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Linear thermoelastic characterization of anisotropic poly(ethylene terephthalate) films

机译：各向异性聚对苯二甲酸乙二醇酯薄膜的线性热弹性表征

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All nine independent elastic constants have been determined for a biaxially stretched poly(ethylene terephthalate) (PET) film using novel mechanical methods. The orthotropic directions and the in-plane Poisson's ratios were first characterized using vibrational holographic interferometry of tensioned membrane samples. The out-of-plane Poisson's ratio was obtained by measuring the change in tension with the change in pressure for constant strain conditions. Pressure-volume-temperature (PVT) equipment was used to measure the bulk compressibility as well as the volumetric thermal expansion coefficient (TEC). The inplane Young's moduli were obtained by tensile tests, while the out-of-plane, modulus was calculated from the compressibility and other elastic constants that describe the inplane behavior. The in-plane TECs in the machine and transverse directions were determined using a thermal mechanical analyzer (TMA). The out-of-plane TEC was determined using these values and the volumetric TEC determined via PVT. The resulting compliance matrix satisfies all of the requirements of a positive-definite energy criterion. The procedure of characterization utilized in this article can be applied to any orthotropic film. (C) 2002 Wiley Periodicals, Inc. [References: 20]
机译：使用新型机械方法已确定了双轴拉伸聚对苯二甲酸乙二醇酯（PET）薄膜的所有九个独立弹性常数。正交各向异性方向和面内泊松比首先通过张拉膜样品的振动全息干涉法进行表征。通过在恒定应变条件下测量张力随压力的变化来获得面外泊松比。压力-体积-温度（PVT）设备用于测量体积可压缩性以及体积热膨胀系数（TEC）。平面杨氏模量是通过拉伸试验获得的，而平面外模量是由可压缩性和描述平面行为的其他弹性常数计算得出的。使用热机械分析仪（TMA）确定纵向和横向的面内TEC。使用这些值确定面外TEC，并通过PVT确定体积TEC。所得的合规性矩阵满足正定能量标准的所有要求。本文使用的表征程序可以应用于任何正交各向异性薄膜。 （C）2002 Wiley Periodicals，Inc. [参考：20]

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