Volume 9, Issue 2
An Immersed Finite Element Method for the Elasticity Problems with Displacement Jump

Daehyeon Kyeong & Do Young Kwak

Adv. Appl. Math. Mech., 9 (2017), pp. 407-428.

Published online: 2018-05

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  • Abstract

In this paper, we propose a finite element method for the elasticity problems which have displacement discontinuity along the material interface using uniform grids. We modify the immersed finite element method introduced recently for the computation of interface problems having homogeneous jumps [20, 22]. Since the interface is allowed to cut through the element, we modify the standard CrouzeixRaviart basis functions so that along the interface, the normal stress is continuous and the jump of the displacement vector is proportional to the normal stress. We construct the broken piecewise linear basis functions which are uniquely determined by these conditions. The unknowns are only associated with the edges of element, except the intersection points. Thus our scheme has fewer degrees of freedom than most of the XFEM type of methods in the existing literature [1,8,13]. Finally, we present numerical results which show optimal orders of convergence rates.

  • Keywords

Elasticity problems, finite element method, Crouzeix-Raviart element, displacement discontinuity.

  • AMS Subject Headings

65N30, 74S05, 74B05

  • Copyright

COPYRIGHT: © Global Science Press

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@Article{AAMM-9-407, author = {}, title = {An Immersed Finite Element Method for the Elasticity Problems with Displacement Jump}, journal = {Advances in Applied Mathematics and Mechanics}, year = {2018}, volume = {9}, number = {2}, pages = {407--428}, abstract = {

In this paper, we propose a finite element method for the elasticity problems which have displacement discontinuity along the material interface using uniform grids. We modify the immersed finite element method introduced recently for the computation of interface problems having homogeneous jumps [20, 22]. Since the interface is allowed to cut through the element, we modify the standard CrouzeixRaviart basis functions so that along the interface, the normal stress is continuous and the jump of the displacement vector is proportional to the normal stress. We construct the broken piecewise linear basis functions which are uniquely determined by these conditions. The unknowns are only associated with the edges of element, except the intersection points. Thus our scheme has fewer degrees of freedom than most of the XFEM type of methods in the existing literature [1,8,13]. Finally, we present numerical results which show optimal orders of convergence rates.

}, issn = {2075-1354}, doi = {https://doi.org/10.4208/aamm.2016.m1427}, url = {http://global-sci.org/intro/article_detail/aamm/12156.html} }
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