一种新型双弹簧、双活塞本构模型在聚合物黏弹性质描述中的应用研究

Study about a new two-spring-two-piston constitutive model describing visco-elastic behavior of polymer

推导了双弹簧、双活塞黏弹性力学模型的本构方程.在CETR UMT-2型试验机及LKDM-2000轮廓摩擦磨损仪上考察了尼龙PA66、聚四氟乙烯、聚甲基丙烯酸甲酯、聚甲醛和聚醚型聚氨酯等材料的静态蠕变特性、松弛特性.分别利用标准线性固体模型和新型本构模型对实验材料的蠕变、松弛特性进行了表征.实验事实及理论计算结果表明,相对于标准线性固体模型而言,该力学模型能更好地反映聚合物材料的蠕变、松弛等黏弹性质.

The constitutive equation of two-spring-two-piston visco-elastic mechanic model was deduced in this paper. The static creep and relaxation characteristics of PA66, PTFE, PMMA, POM and PEUR were studied on CETR UMT-2 tester and LKDM-2000 tester. The standard linear solid model and a new mechanic model, both were applicable in describing the fluctuation of creep and relaxation, were adopted to tracking the variations of experiment statistics separately for comparative study. According to testing results, comparing analysis showed that two-spring-two-piston mechanic model can described effectively visco-elastic behavior of polymer than standard linear solid model.