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Nonlinear Thermohyperviscoelastic Constitutive Model for Soft Materials with Strain Rate and Temperature Dependency
International Journal of Applied Mechanics ( IF 3.5 ) Pub Date : 2020-07-13 , DOI: 10.1142/s1758825120500593
Zahra Matin Ghahfarokhi 1, 2 , Mehdi Salmani-Tehrani 1 , Mahdi Moghimi Zand 2, 3
Affiliation  

Soft materials, such as polymeric materials and biological tissues, often exhibit strain rate and temperature-dependent behavior when subjected to external loads. To characterize the thermomechanical behavior of isotropic soft material, a thermohyperviscoelastic constitutive model has been developed through an additive decomposition of strain energy function into elastic and viscous parts. A three-term generalized Rivlin strain energy function is utilized to formulate the hyperelastic part of the model, while a new viscous potential function is proposed to describe the effect of strain rate and temperature on material behavior. Toward this end, a new procedure has been proposed to determine the viscous mechanical properties as a function of strain-rate and temperature. Comparing with the previously published experimental data for linear low-density polyethylene reveals that the proposed model can sufficiently capture the nonlinearity, rate- and temperature-dependent behavior of the soft materials.

中文翻译:

具有应变率和温度依赖性的软材料非线性热超粘弹性本构模型

软材料,例如聚合物材料和生物组织,在受到外部载荷时通常会表现出应变率和温度相关的行为。为了表征各向同性软材料的热机械行为,通过将应变能函数加性分解为弹性和粘性部分,开发了热超粘弹性本构模型。使用三项广义 Rivlin 应变能函数来表述模型的超弹性部分,同时提出新的粘性势函数来描述应变率和温度对材料行为的影响。为此,已经提出了一种新程序来确定作为应变率和温度函数的粘性机械性能。
更新日期:2020-07-13
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