Round-Robin Study on Stress Analysis for the Effective Notch Stress Approach
- 339 Downloads
The effective notch stress approach for the fatigue strength assessment of welded structures as included in the Fatigue Design Recommendations of the IIW requires the numerical analysis of the elastic notch stress in the weld toe and/or weld root which is fictitiously rounded with a radius of 1 mm. In order to establish guidelines for modelling the structure and evaluating the results, several numerical analyses have been performed in a round robin. This covers three welded details of different complexity where either the weld toe or the weld root is the potential crack location. The first example is a cruciform joint with non-load carrying fillet welds in one load case and load carrying in the other. The second is a complex T-joint of rectangular hollow section (RHS) members which was also subject of the so-called SAE-FDE weld challenge to predict fatigue life. The third is the fillet-welded end connection of a RHS joint being prone to fatigue failure at the weld root with non-fused root faces. The results are compared with each other and conclusions are drawn with regard to appropriate modelling and to the scatter of results to be expected.
IIW-Thesaurus keywordsComputation Cruciform joints Fillet welds Finite element analysis Notch effect Reference lists Stress analysis Stress distribution T joints Welded joints
Unable to display preview. Download preview PDF.
- Köttgen V.B., Olivier R., Seeger T.: Fatigue analysis of welded connections based on local stresses, 1991, DVS-Report No. 133, Düsseldorf, DVS-Verlag (in German), English translation in IIW-doc. XIII-1408-91/XV-802–92.Google Scholar
- Köttgen V.B., Olivier R., Seeger T.: The damage of the large wind energy converter GROWIAN — fatigue strength analysis of the critical welded joints, 1993, Konstruktion 45, pp. 1-9 (in German), and partly in: Damage at the large wind power plant GROWIAN — fatigue analysis of critical welded joints. IIW Doc. XIII-1497–93.Google Scholar
- Morgenstern C., Sonsino C.M., Hobbacher A., Sorbo F.: Fatigue design of aluminium welded joints by local stress concept with the fictitious notch radius of rf= 1 mm, IIW-Doc. XIII-2009–04, 2004.Google Scholar
- Anthes R.J., Köttgen V.B., Seeger T.: Kerbformzahlen von Stumpfstöβen und Doppel-T-Stößen, Schweißen und Schneiden, 1993, 45, 12, pp. 685–688.Google Scholar
- Lehrke H.P.: Calculation of stress concentration factors for welded joints, Konstruktion, 1999, 51, 1/2, pp. 47–52 (in German).Google Scholar
- SAE (2003): http://www.fatigue.org/weld/challenge-1.
- Kyuba H., Dong P.: Equilibrium-equivalent structural stress approach to fatigue analysis of a tubular joint, IIW Doc. XIII-1992-03/XV-1149–03.Google Scholar
- Niemi E., Fricke W., Maddox S.: Fatigue analysis of welded components — Designer’s guide to the structural hot spot stress approach, IIW-1430–00, Cambridge (UK), Woodhead Publ., 2006.Google Scholar
- Fricke W., Kahl A.: Fatigue assessment of weld root failure of hollow section joints by structural and notch stress approaches, Proc. of 11th Int. Symposium on Tubular Structures (ISTS 11), Quebec, 2006.Google Scholar