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Notch stress and fracture mechanics based assessment of fatigue of seam weld ends under shear loading

Shams, Ehsan and Malikoutsakis, Michail and Savaidis, Georg and Vormwald, Michael (2014):
Notch stress and fracture mechanics based assessment of fatigue of seam weld ends under shear loading.
In: Fatigue & Fracture Engineering Materials & Structures, Wiley Publishing Ltd., pp. 740-750, (37), [Article]

Abstract

Welding processes often lead to pronounced weld termination points (start/end), which are prone to fatigue events such as crack initiation. The fatigue of weld ends under shear loading, especially in thin sheet structures, is not sufficiently explored yet. In the present investigation, the real geometry of welds was obtained by scanning the three-dimensional surface, especially of weld ends. Cryogenic breaking of the weld opened the view to the weld root geometry and especially to the critical location, where the weld root migrates to a weld toe at the weld end. In the experimental part of this research, fatigue testing of thin sheet plane and cylindrical specimens as well as large components containing weld ends was performed. Based on the data, weld end life curves have been obtained. The notch stress concept and a fracture mechanics based approach were applied for describing the results of fatigue tests providing sufficient accuracy.

Item Type: Article
Erschienen: 2014
Creators: Shams, Ehsan and Malikoutsakis, Michail and Savaidis, Georg and Vormwald, Michael
Title: Notch stress and fracture mechanics based assessment of fatigue of seam weld ends under shear loading
Language: English
Abstract:

Welding processes often lead to pronounced weld termination points (start/end), which are prone to fatigue events such as crack initiation. The fatigue of weld ends under shear loading, especially in thin sheet structures, is not sufficiently explored yet. In the present investigation, the real geometry of welds was obtained by scanning the three-dimensional surface, especially of weld ends. Cryogenic breaking of the weld opened the view to the weld root geometry and especially to the critical location, where the weld root migrates to a weld toe at the weld end. In the experimental part of this research, fatigue testing of thin sheet plane and cylindrical specimens as well as large components containing weld ends was performed. Based on the data, weld end life curves have been obtained. The notch stress concept and a fracture mechanics based approach were applied for describing the results of fatigue tests providing sufficient accuracy.

Journal or Publication Title: Fatigue & Fracture Engineering Materials & Structures
Number: 37
Publisher: Wiley Publishing Ltd.
Uncontrolled Keywords: fatigue life, notch stress concept, shear loading, stress intensity factor, weld ends
Divisions: 13 Department of Civil and Environmental Engineering Sciences > Institute of Steel Constructions and Material Mechanics > Fachgebiet Werkstoffmechanik
13 Department of Civil and Environmental Engineering Sciences > Institute of Steel Constructions and Material Mechanics
13 Department of Civil and Environmental Engineering Sciences
Date Deposited: 02 Jul 2014 12:02
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