arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2002.12140cond-mat.soft
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随机弹性体中的可能条纹

Likely striping in stochastic nematic elastomers

L. Angela Mihai, Alain Goriely

摘要:

对于单畴弹性体,我们构建了广义的弹性-弹性本构模型相结合的纯弹性和新古典型应变-能量密度。受随机弹性最近发展的启发,我们将这些模型扩展到随机弹性的形式,其中模型参数由空间独立的概率密度函数在连续水平定义。为了研究这些系统的行为,并证明概率参数的影响,我们专注于经典问题的剪切条纹在拉伸弹性体的解决方案是明确的。我们发现,不像在新古典的情况下,非均匀变形发生在一个普遍的间隔,是独立的弹性模量,弹性模量模型,临界区间取决于材料参数。对于随机扩展,这个区间的边界是概率性的,并且齐次和非齐次状态在两者都有给定概率发生的意义上竞争。我们将此间隔内的不均匀模式称为“可能的条纹”。

英文摘要:

For monodomain nematic elastomers, we construct generalised elastic-nematic constitutive models combining purely elastic and neoclassical-type strain-energy densities. Inspired by recent developments in stochastic elasticity, we extend these models to stochastic-elastic-nematic forms where the model parameters are defined by spatially-independent probability density functions at a continuum level. To investigate the behaviour of these systems and demonstrate the effects of the probabilistic parameters, we focus on the classical problem of shear striping in a stretched nematic elastomer for which the solution is given explicitly. We find that, unlike in the neoclassical case where the inhomogeneous deformation occurs within a universal interval that is independent of the elastic modulus, for the elastic-nematic models, the critical interval depends on the material parameters. For the stochastic extension, the bounds of this interval are probabilistic, and the homogeneous and inhomogeneous states compete in the sense that both have a a given probability to occur. We refer to the inhomogeneous pattern within this interval as "likely striping".

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