Issue 9

C. M. Sonsino, Frattura ed Integrità Strutturale, 9 (2009) 3-12; DOI: 10.3221/IGF-ESIS.09.01 11 Figure 17 : Accuracy of fatigue life estimations according to different concepts by the example of welded K-nodes. C ONCLUSIONS AND S UMMARY he applied local concepts show similar results. The observed differences in the results are certainly due to the particular assessments but still tolerable and support the overall evaluation of the structural durability behaviour of the K-nodes, i.e. for assessing the safety of a structure the parallel application of different concepts, their reliably provided, assures the evaluation. In this context good balance between calculations, experimental verifications and feedbacks from field service, Fig. 18, lead to a reliable design. Figure 18 : Knowledge interaction for reliable design. R EFERENCES [1] C.M. Sonsino, Mat.-wiss.u. Werkstofftech. 38-1 (2007) 9. [2] D.Radaj, C.M. Sonsino, W. Fricke, Fatigue Assessment of Welded Joints by Local Approaches Woodhead Publishing, Cambridge, (2006) 2 nd Edition. [3] Corrosion Fatigue of Welded Tubular Joints and Cast-Steel Compound Tubular Joints in Large Size Scale Report No. EUR 14316 DE, Brussels, European Coal and Steel Commission (1993). [4] A.Hobbacher (Ed.), Recommendations for Fatigue Design of Welded Joints and Components IIW Doc. No. XIII- 1823-07 (update July 2008). [5]. Rules for Classification and Construction Offshore Technology, Part 2 Offshore Installations Structural Design, Section 3 G: Fatigue Germanischer Lloyd, Hamburg (1990). [6] C.M. Sonsino, Suggested Allowable Equivalent Stresses for Fatigue Design of Welded Joints According to the Notch Stress Concept with the Reference Radii r ref = 1.00 and 0.05 mm IIW-Doc. No. XIII-2216-08 / XV-1285-08, Graz (2008). T