A node-based smoothed extended finite element method (NS-XFEM) for fracture analysis

Vu-Bac, N., Nguyen-Xuan, H., Chen, L., Bordas, S., Kerfriden, P., Simpson, R.N., Liu, G.R. and Rabczuk, T. (2011) A node-based smoothed extended finite element method (NS-XFEM) for fracture analysis. Computer Modeling in Engineering and Sciences, 73(4), pp. 331-356. (doi: 10.3970/cmes.2011.073.331)

Abstract

This paper aims to incorporate the node-based smoothed finite element method (NS-FEM) into the extended finite element method (XFEM) to form a novel numerical method (NS-XFEM) for analyzing fracture problems of 2D elasticity. NS-FEM uses the strain smoothing technique over the smoothing domains associated with nodes to compute the system stiffness matrix, which leads to the line integrations using directly the shape function values along the boundaries of the smoothing domains. As a result, we avoid integration of the stress singularity at the crack tip. It is not necessary to divide elements cut by cracks when we replace interior integration by boundary integration, simplifying integration of the discontinuous approximation. The key advantage of the NS-XFEM is that it provides more accurate solutions compared to the XFEM-T3 element. We will show for two numerical examples that the NS-XFEM significantly improves the results in the energy norm and the stress intensity factors. For the examples studied, we obtain super-convergent results.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Bordas, Dr Stephane and Simpson, Dr Robert
• Authors: Vu-Bac, N., Nguyen-Xuan, H., Chen, L., Bordas, S., Kerfriden, P., Simpson, R.N., Liu, G.R., and Rabczuk, T.
• College/School: College of Science and Engineering > School of Engineering > Infrastructure and Environment
• Journal Name: Computer Modeling in Engineering and Sciences
• Publisher: Tech Science Press
• ISSN: 1526-1492