基于MATLAB的聚氨酯材料蠕变实验数据分析及拟合

Creep Experimental Data Analysis and Data Fitting of Polyurethane Material Based on MATLAB

聚氨酯是一种新型的弹性橡胶材料,其力学性能受材料配方、加载模式以及温湿度等影响,应力应变是非线性的。为得到一个更合适的本构模型描述聚氨酯的静态和蠕变特性,采用数学推理方法,通过对聚氨酯试样(小圆柱体)进行静态压缩和蠕变实验,得到其弹性模量和在不同荷载下的蠕变曲线,再利用MATLAB软件对其蠕变曲线进行拟合,确定所选模型中蠕变方程的相关蠕变参数。此方法可推广应用于其他类型的隔振器,对聚氨酯材料在新型隔振元件设计中的应用具有一定的指导意义。

Polyurethane （ pu） is a new type of elastic rubber material. Its mechanical properties are affected by the material formula,loading mode,as well as the temperature,humidity and so on;the stress and strain is nonlinear. In order to get a more suitable constitutive model and a better description of the static and creep property of PU vibration isolator,a method of phenomenological theory based on mathematical reasoning is a-dopted in this paper. Concrete ideas are as follows：firstly,the elastic modulus and creep curves under differ-ent load are obtained through the static compression and creep experiments of the PU sample （ small cylin-der） . Then, the creep parameters related to the creep equation of the selected model are determined by using the MATLAB to carry out creep curve fittings. This method can be applied to other types of vibration isolator and can exert a certain guiding significance on the application of PU materials in new type vibration isolator design.