Xu Wenshuai, Zhang Mangong, Liu Yu, Zhang Hao, Chen Meng, Jiang Heng, Wang Yuren
Key Laboratory of Microgravity, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China.
School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China.
Polymers (Basel). 2020 Jul 17;12(7):1588. doi: 10.3390/polym12071588.
Elastomer compositions containing various particulate fillers can be formulated according to the specific functions required of them. Stress softening-which is also known as the Mullins effect-occurs during high loading and unloading paths in certain supramolecular elastomer materials. Previous experiments have revealed that the load-displacement response differs according to the filler used, demonstrating an unusual model of correspondence between the constitutive materials. Using a spherical indentation method and numerical simulation, we investigated the Mullins effect on polyurethane (PU) compositions subjected to cyclic uniaxial compressive load. The PU compositions comprised rigid particulate fillers (i.e., nano-silica and carbon black). The neo-Hooke model and the Ogden-Roxburgh Mullins model were used to describe the nonlinear deformation behavior of the soft materials. Based on finite element methods and parameter optimization, the load-displacement curves of various filled PUs were analyzed and fitted, enabling constitutive parameter prediction and inverse modeling. Hence, correspondence relationships between material components and constitutive parameters were established. Such relationships are instructive for the preparation of materials with specific properties. The method described herein is a more quantitative approach to the formulation of elastomer compositions comprising particulate fillers.
含有各种颗粒填料的弹性体组合物可根据其所需的特定功能进行配制。应力软化（也称为穆林斯效应）在某些超分子弹性体材料的高加载和卸载过程中发生。先前的实验表明，负载 - 位移响应因所使用的填料而异，这表明本构材料之间存在一种不同寻常的对应模型。使用球形压痕方法和数值模拟，我们研究了循环单轴压缩载荷作用下聚氨酯（PU）组合物的穆林斯效应。PU组合物包含刚性颗粒填料（即纳米二氧化硅和炭黑）。采用新胡克模型和奥格登 - 罗克斯伯勒穆林斯模型来描述软材料的非线性变形行为。基于有限元方法和参数优化，对各种填充PU的载荷 - 位移曲线进行了分析和拟合，从而实现本构参数预测和逆建模。因此，建立了材料成分与本构参数之间的对应关系。这种关系对于制备具有特定性能的材料具有指导意义。本文所述方法是一种更定量的方法，用于配制包含颗粒填料的弹性体组合物。
