A modified formulation of quasi-linear viscoelasticity for transversely isotropic materials under finite deformation.

A modified formulation of quasi-linear viscoelasticity for transversely isotropic materials under finite deformation.
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DOI:
10.1098/rspa.2018.0231
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发表时间:
2018-09
期刊:
Proceedings. Mathematical, physical, and engineering sciences
影响因子:
--
通讯作者:
Parnell WJ
Parnell WJ
中科院分区:
其他
文献类型:
--
作者:
Balbi V;Shearer T;Parnell WJ

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对横观各向同性(TI)材料有限变形的准线性粘弹性(QLV)理论进行了修正和发展。第一次,不同的松弛响应被纳入一个整体的非线性粘弹性的制定,根据变形的物理模式。该理论是一致的线性粘弹性在小应变极限,并利用松弛函数,可以确定从小应变实验,给定的时间/变形分离性假设。在考虑了适用于可压缩材料的一般本构形式之后,注意力被限制在不可压缩介质上。这使得一个紧凑的形式的本构关系推导出来,这是用来说明三个关键变形下的模型的行为:单轴拉伸,横向剪切和纵向剪切。最后,它表明,坡印亭效应是存在于TI,新胡克,修改QLV材料下的横向剪切,在对比新胡克弹性材料进行相同的变形。它的存在被解释的各向异性弛豫响应的介质。
The theory of quasi-linear viscoelasticity (QLV) is modified and developed for transversely isotropic (TI) materials under finite deformation. For the first time, distinct relaxation responses are incorporated into an integral formulation of nonlinear viscoelasticity, according to the physical mode of deformation. The theory is consistent with linear viscoelasticity in the small strain limit and makes use of relaxation functions that can be determined from small-strain experiments, given the time/deformation separability assumption. After considering the general constitutive form applicable to compressible materials, attention is restricted to incompressible media. This enables a compact form for the constitutive relation to be derived, which is used to illustrate the behaviour of the model under three key deformations: uniaxial extension, transverse shear and longitudinal shear. Finally, it is demonstrated that the Poynting effect is present in TI, neo-Hookean, modified QLV materials under transverse shear, in contrast to neo-Hookean elastic materials subjected to the same deformation. Its presence is explained by the anisotropic relaxation response of the medium.
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