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arXiv 2005.01021math.NAcs.NA
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线性粘弹性标准模型的约化对称混合有限元法

A mixed finite element method with reduced symmetry for the standard model in linear viscoelasticity

Gabriel N. Gatica, Antonio Márquez, Salim Meddahi

摘要:

介绍并分析了粘弹性标准线性模型的一种新的混合有限元法。采用线性弹性动力学的方法,将问题转化为二阶双曲型偏微分方程,在用运动方程消除位移未知量后,应力张量仍为主要变量,证明了变分形式的适定性,并证明了一类$\text{H}(\text{div})$协调半离散格式的收敛性.然后,利用Newmark梯形法则得到了相应的全离散格式,并建立了其主要的收敛性结果。最后,数值例子说明该方法的性能报告。

英文摘要:

We introduce and analyze a new mixed finite element method with reduced symmetry for the standard linear model in viscoelasticity. Following a previous approach employed for linear elastodynamics, the present problem is formulated as a second-order hyperbolic partial differential equation in which, after using the motion equation to eliminate the displacement unknown, the stress tensor remains as the main variable to be found. The resulting variational formulation is shown to be well-posed, and a class of $\text{H}(\text{div})$-conforming semi-discrete schemes is proved to be convergent. Then, we use the Newmark trapezoidal rule to obtain an associated fully discrete scheme, whose main convergence results are also established. Finally, numerical examples illustrating the performance of the method are reported.

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