Experimental and theoretical investigation of nonlinear viscoelastic polyurethane systems
Experimental and theoretical investigation of nonlinear viscoelastic polyurethane systems
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DOI：
10.1007/s10853-006-1479-4
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发表时间：
2007-12-01
影响因子：
4.5
通讯作者：
Possart, Wulff
中科院分区：
文献类型：
--
作者：
Johlitz, Michael;Steeb, Holger;Possart, Wulff
通过连续单轴拉伸试验和逐步松弛试验研究了聚氨酯（PUR）网络的非线性粘弹性行为。在建模方面的内部变量的概念，有限的Neo-Hookean材料模型与内部变量的线性演化方程相结合，包括粘弹性引起的时间依赖性。参数识别的进化策略结合非线性有限元分析，解决了边界值问题的试样的几何形状和测试条件。总之，所描述的实验和建模的组合提供了给定PUR的机械行为的完整描述。
The non-linear viscoelastic behaviour of a polyurethane (PUR) network is determined by continuous uniaxial tension tests and stepwise relaxation tests. Following the concept of internal variables on the modelling side, the finite Neo-Hookean material model combined with linear evolution equations for the internal variables is applied to include the time-dependence caused by viscoelasticity. The parameters are identified by an evolution strategy combined with a non-linear finite element analysis which solves the boundary value problem given by the specimen geometry and testing conditions. In conclusion, the combination of the described experiments and modelling provides a full description of the mechanical behaviour of the given PUR.