Communications on Applied Mathematics and Computation ›› 2026, Vol. 8 ›› Issue (3): 851-867.doi: 10.1007/s42967-025-00476-4

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On the Superconvergence of a Conforming Mixed Finite Element for Linear Elasticity on Uniform n-Square Grids

Hongying Man1, Shangyou Zhang2   

  1. 1. School of Mathematics, Beijing Institute of Technology, Beijing, 100081, China;
    2. Department of Mathematical Sciences, University of Delaware, Newark, DE, 19716, USA
  • 收稿日期:2024-02-21 修回日期:2024-12-30 出版日期:2026-06-20 发布日期:2026-05-29
  • 通讯作者: Hongying Man, Email: manhy@bit.edu.cn E-mail:manhy@bit.edu.cn
  • 作者简介:Shangyou Zhang, Email: szhang@udel.edu
  • 基金资助:
    Not applicable.

On the Superconvergence of a Conforming Mixed Finite Element for Linear Elasticity on Uniform n-Square Grids

Hongying Man1, Shangyou Zhang2   

  1. 1. School of Mathematics, Beijing Institute of Technology, Beijing, 100081, China;
    2. Department of Mathematical Sciences, University of Delaware, Newark, DE, 19716, USA
  • Received:2024-02-21 Revised:2024-12-30 Online:2026-06-20 Published:2026-05-29
  • Contact: Hongying Man, Email: manhy@bit.edu.cn E-mail:manhy@bit.edu.cn
  • Supported by:
    This work was subsidized by the National Natural Science Foundation of China (No. 12361078) and the Guangxi Natural Science Foundation of China (Nos. 2018JJB110062, 2019AC20062, 2021JJB110006, and 2021AC19147).

摘要: This paper is to prove one-order superconvergence of both stress and displacement of a conforming symmetric mixed finite element on uniform n-square grids, for the linear elasticity equation in the Hellinger-Reissner variational formulation. Numerical examples on 2D and 3D uniform square grids are computed, verifying the theory.

关键词: Mixed finite element, Linear elasticity, Conforming finite element, Superconvergence, Square grids

Abstract: This paper is to prove one-order superconvergence of both stress and displacement of a conforming symmetric mixed finite element on uniform n-square grids, for the linear elasticity equation in the Hellinger-Reissner variational formulation. Numerical examples on 2D and 3D uniform square grids are computed, verifying the theory.

Key words: Mixed finite element, Linear elasticity, Conforming finite element, Superconvergence, Square grids

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