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Schwingfeste Auslegung von Schweißverbindungen aus der Magnesiumknetlegierung AZ31(ISO-MgAl3Zn1) mit dem Konzept der fiktiven Ersatzradien von rf = 1,0 mm und 0,05 mm

Fatigue design of welded joints from the wrought magnesium alloy AZ31 (ISO-MgAlZn1) by the local stress concept with the fictitious notch radius of r(f)=1.0 mm and 0.05 mm
 
: Karakas, Ö.; Morgenstern, C.; Sonsino, Cetin Morris

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Materialwissenschaft und Werkstofftechnik 38 (2007), No.7-8, pp.603-612
ISSN: 0933-5137
German
Journal Article
Fraunhofer LBF ()
Ersatzradius; Schwingfestigkeit; Schweißverbindung; Magnesium; Magnesiumlegierung

Abstract
The investigations were carried out with three different types of MIG- and TIG-welded magnesium joints of the alloy AZ31. The evaluation of the results showed that the local stress concept using the fictitious notch radius of r(f) = 1.0 mm can be applied to magnesium welded joints from plates with thicknesses >= 5 mm independently of the weld geometries (fully or partially penetrated butt welds, transversal stiffeners). Design curves are proposed for different stress ratios, i.e. R = -1 as well as 0 and 0.5, which allow the consideration of residual stresses as well as load induced mean stresses. The results permit also the suggestion of Delta sigma = 28 MPa as FAT-value for the IIW-Fatigue Design Recommendations. Further, the FAT-value Delta sigma = 73 MPa for the fictitious radius of r(f) = 0.05 mm to be applied to welded thin magnesium joints is derived, too. These FAT-values are compared with already known data for steel and aluminium joints. A linear relationship between the FAT-values and the Young's modulus is determined.

: http://publica.fraunhofer.de/documents/N-64966.html