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对方平组织为基布的PVC(polyvinylchloride)涂层膜材料进行了经、纬两方向五种应力条件下的拉伸蠕变试验。利用七参数(四个蠕变柔量与三个推迟时间)广义Kelvin-Voigt线性粘弹性蠕变模型对试验数据进行了分析,从中发现:对于单个应力,线性粘弹性蠕变模型具有很好的拟合效果,而对于多个应力,三个推迟时间参数保持不变,并以此为基础,将七参数广义Kelvin-Voigt线性粘弹性蠕变模型修改为适合膜材料的七参数(四个蠕变柔量与三个推迟时间)非线性粘弹性和十四参数(八个蠕变柔量与六个推迟时间)非线性粘弹塑蠕变模型,并把十四参数非线性粘弹塑蠕变模型合并为四个蠕变柔量与三个推迟时间的七参数非线性模型,再将这两种非线性模型中的三个推迟时间设定为与线性粘弹性蠕变模型相同,同时还设定非线性部分均来自于四个蠕变柔量,最后借助四阶多项式对不同应力与对应的蠕变柔量进行了拟合,结果发现:该方法可以很好预测其他应力的蠕变特性。
The other side of the organization for the fabric of PVC (polyvinylchloride) coating film material through the weft and the two directions of tensile stress creep test under five conditions. The experimental data were analyzed by using the generalized Kelvin-Voigt linear viscoelastic creep model with seven parameters (four creep compliance and three postponements). It was found that for a single stress, the linear viscoelastic creep model has very good And the effect is fitted. For three stresses, the three delay time parameters are kept unchanged. Based on this, the seven parameter generalized Kelvin-Voigt linear viscoelastic creep model is modified to fit the seven parameters of the membrane material (four creep And three postponed time) nonlinear viscoelasticity and fourteen parameters (eight creep compliance and six delay time) nonlinear viscoelastic plastic creep model, and the fourteen parameter nonlinear viscoelastic plastic creep Variable model into four creep compliance and three postponed time of the seven parameter nonlinear model, then these two nonlinear model of the three delay time is set to be the same as the linear viscoelastic creep model, but also The non-linear part is set by four creep compliance. Finally, the fourth-order polynomial is used to fit the different creep compliance and the corresponding creep compliance. The results show that this method can predict the creep characteristics of other stresses well .