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Basis for viscoelastic modelling of polyethylene terephthalate (PET) near Tg with parameter identification from multi-axial elongation experiments

机译:Tg附近的聚对苯二甲酸乙二酯(PET)的粘弹性建模的基础以及多轴延伸实验中的参数识别

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摘要

The mechanical response of Polyethylene Terephthalate (PET) in elongation is strongly dependent on temperature, strain and strain rate. Near the glass transition temperature Tg, the stress vs strain curves present a strain hardening effect vs strain under conditions of large deformations. At a given strain value, the strain rate has also an increasing influence on the stress value. The main goal of this work is to propose a visco-elastic model to predict the PET behaviour when subjected to large deformations and to determine the material properties from the experimental data. The visco-elastic model is written in a Leonov like way and the variational formulation is carried out for the numerical simulation using this model. To represent the non–linear effects, an elastic part depending on the elastic equivalent strain and a non-Newtonian viscous part depending on both viscous equivalent strain rate and cumulated viscous strain are tested. The model parameters can then be accurately obtained through the comparison with the experimental uniaxial and biaxial tests.
机译:聚对苯二甲酸乙二酯(PET)在伸长率方面的机械响应在很大程度上取决于温度,应变和应变率。在玻璃化转变温度Tg附近,应力-应变曲线在大变形条件下呈现出应变硬化效应与应变的关系。在给定的应变值下,应变率对应力值的影响也越来越大。这项工作的主要目的是提出一种粘弹性模型,以预测大变形时的PET行为并根据实验数据确定材料性能。以Leonov的方式编写粘弹性模型,并使用该模型对数值模拟进行变分公式化。为了表示非线性效应,测试了取决于弹性当量应变的弹性部分和取决于粘性当量应变率和累积粘性应变的非牛顿粘性部分。然后,通过与实验单轴和双轴测试进行比较,可以准确地获得模型参数。

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