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Acta Mechanica
Published in: Acta Mechanica 2/2020

27-11-2019 | Original Paper

Accurate evaluation of stress intensity factors using dual interpolation boundary face method

Authors: Yunqiao Dong, Jianming Zhang, Weicheng Lin

Published in: Acta Mechanica | Issue 2/2020

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Abstract

Accurate computation of stress intensity factors for two-dimensional cracks by a dual interpolation boundary face method (DiBFM) is presented in this paper. Dual interpolation method combines traditional element polynomial interpolation and moving least-squares approximation. Dual interpolation elements are obtained by adding virtual nodes on the boundary of traditional discontinuous elements, and they unify traditional continuous and discontinuous elements. With the dual interpolation elements, both the continuous and discontinuous fields can be approximated, and the accuracy of interpolation increases by two orders compared with the corresponding discontinuous elements. In addition, a new singular element based on the dual interpolation method for modeling displacement fields around the crack tip is proposed in this paper. The stress intensity factors are extracted from the relative displacements between the crack surfaces. Using the DiBFM combined with the proposed singular element, accurate results of the stress intensity factors can be obtained. Numerical examples have demonstrated the accuracy and efficiency of the proposed method.
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Metadata
Title
Accurate evaluation of stress intensity factors using dual interpolation boundary face method
Authors
Yunqiao Dong
Jianming Zhang
Weicheng Lin
Publication date
27-11-2019
Publisher
Springer Vienna
Published in
Acta Mechanica / Issue 2/2020
Print ISSN: 0001-5970
Electronic ISSN: 1619-6937
DOI
https://doi.org/10.1007/s00707-019-02573-x

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