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arXiv 2104.12427math.NAcs.NA
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动态线性粘弹性模型对称内罚间断Galerkin有限元法的先验分析

A Priori Analysis of a Symmetric Interior Penalty Discontinuous Galerkin Finite Element Method for a Dynamic Linear Viscoelasticity Model

Yongseok Jang, Simon Shaw

摘要:

粘弹性材料如软组织、高温金属和聚合物的应力-应变本构关系可以写成具有\emph{fading memory}核的第二类Volterra积分方程。该积分关系对于给定的应变历史产生当前应力,并且可以在动量平衡定律中用于导出所产生的变形的数学模型。我们考虑这样一个动态线性粘弹性模型问题,从使用一系列的衰减指数,以提供在Volterra内核的衰落记忆\textit{Dirichlet-Prony}。我们引入两种类型的\textit{internal variable}取代Volterra积分与辅助常微分方程系统,然后使用空间不连续的对称内部罚伽辽金(SIPG)有限元法和-在时间上-一个Crank-Nicolson方法制定的完全离散的问题:一个为每种类型的内部变量。我们提出了\textit{a priori}的稳定性和误差分析,而不使用Grönwall的不等式,并与结果,在我们的估计常数随时间线性增长,而不是指数。从这个意义上说,该计划,因此适合于模拟长时间的粘弹性响应,这(据我们所知)是第一次,这样的高质量的估计已被提交SIPG有限元近似的动态粘弹性问题。我们还进行了一些数值实验,使用FEniCS环境(例如\url{https://fenicsproject.org}),并解释如何获得的代码和结果再现。

英文摘要:

The stress-strain constitutive law for viscoelastic materials such as soft tissues, metals at high temperature, and polymers, can be written as a Volterra integral equation of the second kind with a \emph{fading memory} kernel. This integral relationship yields current stress for a given strain history and can be used in the momentum balance law to derive a mathematical model for the resulting deformation. We consider such a dynamic linear viscoelastic model problem resulting from using a \textit{Dirichlet-Prony} series of decaying exponentials to provide the fading memory in the Volterra kernel. We introduce two types of \textit{internal variable} to replace the Volterra integral with a system of auxiliary ordinary differential equations and then use a spatially discontinuous symmetric interior penalty Galerkin (SIPG) finite element method and -- in time -- a Crank-Nicolson method to formulate the fully discrete problems: one for each type of internal variable. We present \textit{a priori} stability and error analyses without using Grönwall's inequality, and with the result that the constants in our estimates grow linearly with time rather than exponentially. In this sense the schemes are therefore suited to simulating long time viscoelastic response and this (to our knowledge) is the first time that such high quality estimates have been presented for SIPG finite element approximation of dynamic viscoelasticty problems. We also carry out a number of numerical experiments using the FEniCS environment (e.g. \url{https://fenicsproject.org}) and explain how the codes can be obtained and the results reproduced.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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