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arXiv 1302.4556cond-mat.soft
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应力相关弹性模量和波速

On stress-dependent elastic moduli and wave speeds

Michel Destrade, Ray W. Ogden

摘要:

本文根据具有初应力的超弹性材料的一般非线性理论,在不考虑初应力来源的情况下,给出了弹性模量增量与应力有关的张量的显式表达式。在考虑三种特殊情况下的初始应力的一般框架内,即静水应力,单轴应力和平面剪应力,然后,我们阐明了一般形式的各种弹性模量的依赖性的初始应力。在每一种情况下,初始应力对均匀平面波的波速的影响进行了研究,并显示了早期文献中的各种特殊理论如何在一般框架内拟合。然后,我们考虑的情况下,初始应力是一个预应力与有限变形,特别是,我们讨论的专业化二阶弹性理论和突出几个经典的方法之间的连接的主题,再次特别提到的影响,高阶项均匀平面波的速度。在早期的文献中出现的一些差异被指出。

英文摘要:

On the basis of the general nonlinear theory of a hyperelastic material with initial stress, initially without consideration of the origin of the initial stress, we determine explicit expressions for the stress-dependent tensor of incremental elastic moduli. In considering three special cases of initial stress within the general framework, namely hydrostatic stress, uniaxial stress and planar shear stress, we then elucidate in general form the dependence of various elastic moduli on the initial stress. In each case the effect of initial stress on the wave speed of homogeneous plane waves is studied and it is shown how various special theories from the earlier literature fit within the general framework. We then consider the situation in which the initial stress is a pre-stress associated with a finite deformation and, in particular, we discuss the specialization to the second-order theory of elasticity and highlight connections between several classical approaches to the topic, again with special reference to the influence of higher-order terms on the speed of homogeneous plane waves. Some discrepancies arising in the earlier literature are noted.

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