By W Fricke
Wolfgang Fricke stories assorted proposals for reference radii including linked S-N curves. the tips supply exact strategies for the numerical research of notch rigidity through the finite or boundary point strategy and current acceptable S-N curves for the overview of the fatigue power of other fabrics. ultimately, 4 examples illustrate the appliance of the method in addition to the range of buildings that are analyzed and the diversity of effects that are received from assorted types. released in organization with the foreign Institute of Welding (IIW).
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Additional info for IIW recommendations for the fatigue assessment of welded structures by notch stress analysis: IIW-2006-09
The topology of the super-element is independent of the sheet-thickness. The parametric super-element is automatically adapted to the actual geometry of the spot-weld and the plate thicknesses. 3 Fatigue Assessment The fatigue assessment was based on the mean S-N curve derived from fatigue tests of simple specimens. The variation in the maximum principal stress in the notch of a selected spot-weld for one door closing (left part of Fig. 25) shows one large pulsating tension cycle, and this is taken to estimate the fatigue life (right part of Fig.
4. © International Institute of Welding, 2012. Published by Woodhead Publishing Limited DEMONSTRATION EXAMPLES 35 Overall model and sub-models of Participant A Fig. 3 Discussion of the Results Although different modelling techniques were used, variations in the results were fairly small if the results of Participant G are excluded due to the influence of elements that were too large. Another finding, already mentioned, is that the choice of sub-modelling technique is a source of inaccuracy. To achieve reliable results, the sub-model and the respective part of the overall model need to have the same stiffness, as already mentioned in Section 3.
Lawrence F V, Ho N J and Mazumdar P K (1981): Predicting the fatigue resistance of welds. Annual Reviews of Material Science, 11, 401–425. Lehrke H-P (1999): Berechnung von Formzahlen für Schweißverbindungen. Konstruktion, 51:1/2, 47–52. © International Institute of Welding, 2012. Published by Woodhead Publishing Limited REFERENCES 41 Lieurade H-P, Huther I and Lebaillif D (2003): Weld quality assessment as regard to fatigue. Proc. of the IIW Fatigue Seminar 2003, Rep. 14, Lappeenranta University of Technology, Finland.