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An adaptive singular ES-FEM for mechanics problems with singular field of arbitrary order

Nguyen-Xuan, H and Liu, GR and Bordas, S and Natarajan, S and Rabczuk, T (2013) An adaptive singular ES-FEM for mechanics problems with singular field of arbitrary order. In: COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING, 253 . pp. 252-273.

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Official URL: http://dx.doi.org/10.1016/j.cma.2012.07.017

Abstract

This paper presents a singular edge-based smoothed finite element method (sES-FEM) for mechanics problems with singular stress fields of arbitrary order. The sES-FEM uses a basic mesh of three-noded linear triangular (T3) elements and a special layer of five-noded singular triangular elements (sT5) connected to the singular-point of the stress field. The sT5 element has an additional node on each of the two edges connected to the singular-point. It allows us to represent simple and efficient enrichment with desired terms for the displacement field near the singular-point with the satisfaction of partition-of-unity property. The stiffness matrix of the discretized system is then obtained using the assumed displacement values (not the derivatives) over smoothing domains associated with the edges of elements. An adaptive procedure for the sES-FEM is proposed to enhance the quality of the solution with minimized number of nodes. Several numerical examples are provided to validate the reliability of the present sES-FEM method. (C) 2012 Elsevier B.V. All rights reserved.

Item Type: Journal Article
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Additional Information: Copy right for this article belongs to ELSEVIER SCIENCE SA, SWITZERLAND
Keywords: Adaptive finite elements;Smoothed finite element method;Singular ES-FEM;Singularity;Crack propagation
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering (Formerly, Aeronautical Engineering)
Date Deposited: 05 Feb 2013 09:47
Last Modified: 05 Feb 2013 09:47
URI: http://eprints.iisc.ernet.in/id/eprint/45714

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