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Influence of Non‐linear Effects on Fatigue Assessment of a Welded Structure
Author(s) -
Pettersson Gert
Publication year - 2006
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.200606474
Subject(s) - structural engineering , finite element method , deflection (physics) , stiffness , welding , stress intensity factor , materials science , stress concentration , linear elasticity , joint (building) , fracture mechanics , engineering , composite material , physics , optics
In this paper root cracks in a welded structure are investigated using the effective notch stress approach and Linear Elastic Fracture Mechanics (LEFM). The problem is complicated by the fact that the welds subjected to endurance stress are located close to a screw joint. The Finite Element (FE) model used for evaluating the fatigue life includes both this screw joint as well as adjacent components and the contact behaviour between the structures. Several important problems in the evaluation of stress intensity factors and notch stresses are investigated. The results can give useful information in the work of performing a fatigue analysis. The areas examined are the significance of the load direction, mesh density, the importance of the right global stiffness in the model, the crack deflection angle and the modelling of a root notch versus the requirements on the drawing.