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Morley Finite Element Method for the von K\'{a}rm\'{a}n Obstacle Problem

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arxiv 2009.03205 v1 pith:VMLIHT54 submitted 2020-09-07 math.NA cs.NA

classification math.NAcs.NA
keywords obstacleproblemarticledataelementfinitemorleypart
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This paper focusses on the von K\'{a}rm\'{a}n equations for the moderately large deformation of a very thin plate with the convex obstacle constraint leading to a coupled system of semilinear fourth-order obstacle problem and motivates its nonconforming Morley finite element approximation. The first part establishes the well-posedness of the von K\'{a}rm\'{a}n obstacle problem and also discusses the uniqueness of the solution under an a priori and an a posteriori smallness condition on the data. The second part of the article discusses the regularity result of Frehse from 1971 and combines it with the regularity of the solution on a polygonal domain. The third part of the article shows an a priori error estimate for optimal convergence rates for the Morley finite element approximation to the von K\'{a}rm\'{a}n obstacle problem for small data. The article concludes with numerical results that illustrates the requirement of smallness assumption on the data for optimal convergence rate.

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Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. A Quadratic $C^0$ Interior Penalty Method for the von K\'{a}rm\'{a}n Obstacle Problem

    math.NA 2026-08 conditional novelty 6.0 of 10

    A quadratic C0 interior penalty method for the von Kármán obstacle problem is proved to have discrete solutions converging in the discrete energy norm with order O(h^α), where α is the biharmonic regularity index of t...

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