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research article

Computing upper and lower bounds for linear outputs of elasticity by the smoothed finite element method

Xuan, Zhaocheng
•
Lassila, Toni Mikael  
•
Rozza, Gianluigi  
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2010
International Journal For Numerical Methods In Engineering

Verification of the computation of local quantities of interest, e.g. the displacements at a point, the stresses in a local area and the stress intensity factors at crack tips, plays an important role in improving the structural design for safety. In this paper, the smoothed finite element method (SFEM) is used for finding upper and lower bounds on the local quantities of interest that are outputs of the displacement field for linear elasticity problems, based on bounds on strain energy in both the primal and dual problems. One important feature of SFEM is that it bounds the strain energy of the structure from above without needing the solutions of different subproblems that are based on elements or patches but only requires the direct finite element computation. Upper and lower bounds on two linear outputs and one quadratic output related with elasticity – the local reaction, the local displacement, and the J-integral – are computed by the proposed method in two different examples. Some issues with SFEM that remain to be resolved are also discussed.

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Type
research article
DOI
10.1002/nme.2825
Web of Science ID

WOS:000280011700002

Author(s)
Xuan, Zhaocheng
Lassila, Toni Mikael  
Rozza, Gianluigi  
Quarteroni, Alfio  
Date Issued

2010

Publisher

Wiley

Published in
International Journal For Numerical Methods In Engineering
Volume

83

Issue

2

Start page

174

End page

195

Subjects

error bounds

•

linear elasticity

•

output

•

finite element method

•

smoothed finite element method

Note

previously IACS report 07.2009

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CMCS  
Available on Infoscience
September 1, 2009
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/42355
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