Table of Contents
ISRN Mechanical Engineering
Volume 2014, Article ID 834659, 7 pages
http://dx.doi.org/10.1155/2014/834659
Research Article

Effect of Density and Pointed Corner Degree of Pore on Local Stress in Welded Structures: Defect in Marine Structures

1LMPM, Mechanical Engineering Department, University of Sidi Bel Abbes, 22000 Sidi Bel Abbes, Algeria
2Institute of Science and Technology, University of Ain Temouchent, BP 284 RP, 46000 Ain Temouchent, Algeria
3Department of Physics, Hazara University, Mansehra 21300, Pakistan

Received 30 July 2013; Accepted 23 October 2013; Published 16 January 2014

Academic Editors: N. Anifantis, R. Brighenti, and S. Cartmell

Copyright © 2014 Farida Bouafia et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The process of assembly by welding, in marine structures, led to the creation of microstructural heterogeneities zones. Welded structures generally contain defects such as lack of penetration, slag inclusion, porosity, and misalignment. Generally these zones can be discontinuities geometrical. At the origins of stress concentration, these regions are favourable sites where fatigue cracks can initiate and propagate. In this study, the 3D finite element method is used to analyze the distribution of stress (strain) generated by the presence in the weld nugget of a pore formed during the welding process. This analysis was made in the matrix-pore interface. The effects of density and pointed corner degree of pore on the stress levels were also analyzed.