Please use this identifier to cite or link to this item: https://hdl.handle.net/11499/8957
Title: Application of Neuber's effective stress method for the evaluation of the fatigue behaviour of magnesium welds
Authors: Karakaş, Özler
Keywords: Effective stress
Fatigue
Magnesium welds
Notch stress
Reference radius
Fatigue of materials
Iterative methods
Magnesium
Welding
Effective stress method
Fatigue behaviour
Micro-structural length
Tensile residual stress
Worst case scenario
Welds
Publisher: Elsevier Ltd
Abstract: In this study, the microstructural length of magnesium welded joints was determined by using experimental data acquired from three different weld geometries and Neuber's stress averaging method. The aim was to determine microstructural length, which is assumed to be a material constant that is identical for all Mg-materials, so that it can be employed for effective stress and fictitious notch radius rf calculations. By considering the worst case scenario, rreal = 0, this fictitious notch radius can be used as a new reference radius rref for magnesium welded joints. Using the reference radii from two different hypotheses rref = 1 mm and rref = 0.05 mm, calculations were performed for notches and data were employed in the calculations. Also FE-analyses were utilised in order to identify the stress gradients for weld geometries. Effective stresses were calculated using experimental data along with the stress gradients in Neuber's stress averaging method. Finally, S-N lines were derived by correlating effective stresses with fatigue life for the worst case with R = 0.5 to account for possible high tensile residual stresses. The scatters of these S-N lines were calculated and compared for every ?* iteration. The length value that resulted in the minimum scatter corresponded to the microstructural length. The identified microstructural length was ?* = 0.12 mm. Until now, there were no published results for microstructural length of magnesium welded joints and the findings in this paper can be used to replace the current recommendations regarding magnesium welded joints. © 2016 Elsevier Ltd
URI: https://hdl.handle.net/11499/8957
https://doi.org/10.1016/j.ijfatigue.2016.10.023
ISSN: 0142-1123
Appears in Collections:Mühendislik Fakültesi Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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