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Verification of fat values for the application of the notch stress concept with the reference radii r(ref)=1.00 AND 0.05 mm

: Kranz, B.; Sonsino, C.M.

Welding in the world 54 (2010), No.7-8, pp.R218-R224
ISSN: 0043-2288
Journal Article
Fraunhofer LBF ()
welding; NOTCH; notch stress

For the verification of the FAT225 value suggested in the IIW Recommendations for the notch stress concept with the reference radius r(ref) = 1.00 mm and of FAT630 for r(ref) = 0.05 mm, investigations were carried out with fully and non-fully penetrated welds, and with non-fully penetrated welds with circular and long holes. The FAT values were confirmed by fatigue tests carried out under the stress ratio R = 0.5. However, in the case of low stress concentrations, e.g. weld toes of butt welds, when r(ref) = 0.05 mm is applied, the FAT class should be downgraded from 630 to 400 MPa to account for the size effect of larger maximum stressed material volumes.