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Nonlinear stress relaxation of filled rubber compounds: A new theoretical model and experimental investigation

机译:填充橡胶化合物的非线性应力松弛:一种新的理论模型和实验研究

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摘要

A new nonlinear hyper-viscoelastic constitutive model was developed to describe the mechanical behavior of filled rubbers. It consists of a conventional strain energy density function like Arruda-Boyce weighted by a four-parameter decay relationship, designed as a function of time and the deviatoric part of the first invariant of the left Cauchy-Green deformation tensor. It was implemented in Abaqus code as a user subroutine. A SBR/BR rubber compound filled with carbon black was selected as the test material. The material parameters were determined by calibrating the data from the uniaxial stress-strain tensile, volumetric, and stress relaxation tests using an optimization loop designed in Isight program. To validate the proposed model, a series of simulations were performed on two rubber strips and a rubber cylinder under extensive and compressive loads, respectively. Comparison with their corresponding experimental data confirmed the accuracy, and validity of the proposed model and approach.
机译:提出了一种新的非线性超粘弹性本构模型来描述填充橡胶的力学行为。它由一个常规的应变能密度函数(如Arruda-Boyce)组成,该函数由一个四参数衰减关系加权,设计为时间函数和左Cauchy-Green变形张量第一不变量的偏差部分。它是在Abaqus代码中作为用户子程序实现的。选择填充有炭黑的SBR/BR橡胶化合物作为试验材料。通过使用Isight程序中设计的优化回路校准单轴应力应变拉伸、体积和应力松弛试验的数据,确定材料参数。为了验证所提出的模型,分别在两个橡胶条和一个橡胶圆筒上进行了一系列模拟,以验证其在大范围和压缩载荷下的有效性。通过与相应实验数据的比较,验证了该模型和方法的准确性和有效性。

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