Issue 9

C. M. Sonsino, Frattura ed Integrità Strutturale, 9 (2009) 3-12 ; DOI: 10.3221/IGF-ESIS.09.01 8 mm with the flank angle  = 45° as well as for the reference radius of r ref = 1.00 mm. Principal stresses, as well as appertaining von Mises stresses (  eq , von Mises = 0.89 x  1 ), are given in Fig. 13 [10] . Figure 12 : Crack propagation in the chord of a K-node. Figure 13 : Hot-spot and weld local notch stresses in the critical area of the weld seam. The accuracy of the notch stress cannot be verified by strain measurements whereas that of the hot-spot stresses can. In Table 2, calculated and measured values are compared. The calculated stresses differ from the measured ones within a range of ± 15%. The differences result from manufacturing dependent inaccuracies from the ideal geometry assumed for the calculations. Thus, the modelling can be considered as reliable. With regard to modelling of welded structures for application of the hot-spot and local stress concepts also the IIW-Recommendations [4] and the appertaining guidelines [11] should be taken into consideration.