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Fatigue crack growth of a welded tube-flange connection under bending and torsional loading

: Amstutz, H.; Störzel, K.; Seeger, T.


Fatigue and Fracture of Engineering Materials and Structures 24 (2001), Nr.5, S.357-368
ISSN: 8756-758X
ISSN: 0160-4112
ISSN: 1460-2695
Fraunhofer LBF ()
weldment fatigue; multiaxial fatigue; crack growth; fatigue life; bending; torsion; stress intensity factor; specimen; steel

In this contribution the results of an experimental investigation into the fatigue crack growth of welded tube-to-plate specimens of steel StE 460 under bending, torsion, and combined in-phase and out-of-phase bending/torsion loading are presented. The tests were performed at stress ratios of R = -1 and R = 0. The residual stresses were reduced by thermal stress relief. The fatigue crack development is compared with the prediction on the crack growth rates of Paris. Individual stress intensity factors for the semielliptical surface cracks in the tube-flange specimens are approximated on a weight function analogy using the published solutions of other workers.