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Goal-Oriented a Posteriori Error Estimates in Nearly Incompressible Linear Elasticity

机译:以几乎不可压缩的线性弹性为导向的后验误差估计

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In this article, we consider linear elastic problems, where Poisson's ratio is close to 0.5 leading to nearly incompressible material behavior. The use of standard linear or d-linear finite elements involves locking phenomena in the considered problem type. One way to overcome this difficulties is given by selective reduced integration. However, the discrete problem differs from the continuous one using this approach. This fact has especially to be taken into account, when deriving a posteriori error estimates. Here, we present goal-oriented estimates based on the dual weighted residual method using only the primal residual due to the linear problem considered. The major challenge is given by the construction of an appropriate numerical approximation of the error identity. Numerical results substantiate the accuracy of the presented estimator and the efficiency of the adaptive method based on it.
机译:在本文中,我们考虑线性弹性问题,其中泊松比接近0.5,导致几乎不可压缩的材料行为。使用标准线性或D线性有限元件涉及所考虑的问题类型中的锁定现象。通过选择性降低的集成来克服这种困难的一种方法。然而,离散问题与使用这种方法的连续一个问题不同。当导出后验误差估计时,尤其要考虑到这一事实。这里,我们基于双重加权残留方法呈现面向目标的估计,其仅由于所考虑的线性问题而仅使用原始残留。主要挑战是通过构建误差标识的适当数值近似。数值结果证实了所提出的估计器的准确性和基于IT的自适应方法的效率。

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