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Advanced numerical modeling of cracked tubular K joints: BEM and FEM comparison

By L. Borges A, S. P. Chiew B, A. Nussbaumer C and C. K. Lee B

Abstract

A critical aspect in the design of tubular bridges is the fatigue performance of the structural joints. The estimation of a fatigue crack life using the Linear Elastic Fracture Mechanics (LEFM) theory involves the calculation of stress intensity factors (SIF) at a number of discrete crack depths. The most direct way is to carry out modeling by either the finite element method (FEM) or the boundary element method (BEM). For tubular joints commonly found in tubular bridges and off-shore structures, due to the complicated geometry resulted from the tubes intersection and welding, the construction of the numerical model often becomes a complex process. This paper presents two different model construction techniques that have been developed independently at the Swiss Federal Institute of Technology (EPFL) and the Nanyang Technological University (NTU), Singapore that are based in the BEM and the FEM, respectively. The SIF values obtained by these two methods are compared. It is Accepted Manuscript found that so long as consistent geometrical models are employed, compatible SIF values Not Copyedite

Topics: Boundary elements, Finite elements, Fracture mechanics, Stress intensity factors, Welded joints, Tubular bridges, K-joints
Year: 2010
OAI identifier: oai:CiteSeerX.psu:10.1.1.352.2629
Provided by: CiteSeerX
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