By Dieter Radaj, Michael Vormwald
In 5 chapters, this quantity offers contemporary advancements in fatigue evaluate. within the first bankruptcy, a generalized Neuber inspiration of fictitious notch rounding is gifted the place the microstructural help elements depend upon the notch beginning perspective along with the loading mode. the second one bankruptcy specifies the notch rigidity issue together with the tension strength density and J-integral notion whereas the SED process is utilized to universal fillet welded joints and to thin-sheet lap welded joints within the 3rd bankruptcy. The forth bankruptcy analyses elastic-plastic deformations within the close to crack tip quarter and discusses driver parameters. The final bankruptcy discusses thermomechanical fatigue, tension, and pressure ranges.
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The deviations remain small in the case of the Beltrami criterion. 1 have been introduced for the support factor s. 5 mm. The notch opening angles are 2a = 0, 90 and 135°. By considering different failure criteria combined with plane stress and plane strain conditions, respectively, a comparison has been carried out between the effective stress concentration factor K t given by Eq. 29) and the stress concentration factor Kt(qf) evaluated with fictitious notch rounding, Eq. 30), modified by j. In both cases, the stresses in the specimens are obtained from the FE analysis.
The evaluation of s for qÃ ! 0 is numerically stable in contrast to the corresponding evaluation in the case of tensile loading. As shown earlier by evaluation of Eq. 43), the limit value of s for q ! 0 when considering a keyhole. This means that the limit value is dependent on the notch shape. Summarising the numerical results, the following trends have been found for the support factor in the case of out-of-plane shear loading: • the factor s depends on the real radius q, starting with lower values for q = 0, but converging to a plateau value for q [ qÃ ; 34 1 Generalised Neuber Concept of Fictitious Notch Rounding Fig.
The condition r/a ( 1 is used after introducing a local r-h polar coordinate system at the apex point of an elliptical notch with radius of curvature q, Fig. 28. A power series expansion of the stress field is performed, neglecting the higher order terms. The resulting equations for in-plane shear loading (mode 2) read as follows: 8 8 9 9 8 9 sin 3h=2 > sin h=2½2 þ cos h=2 cos 3h=2 > > > > < < rx > = = < = KII KII q ry ¼ pﬃﬃﬃﬃﬃﬃﬃﬃ sin h=2 cos h=2 cos 3h=2 À sin 3h=2 þ pﬃﬃﬃﬃﬃﬃﬃﬃ > > > 2pr > 2pr 2r > : : > ; : ; ; sxy À cos 3h=2 cos h=2½1 À sin h=2 sin 3h=2 ð1:59Þ 8 8 9 9 8 9 > > À5 sin h=2 þ 3 sin 3h=2 > < À sin h=2 > < rr > = = K q> = KII < II ð1:60Þ sin h=2 rh ¼ pﬃﬃﬃﬃﬃﬃﬃﬃ À3 sin h=2 À 3 sin 3h=2 þ pﬃﬃﬃﬃﬃﬃﬃﬃ > > > 2pr 2r > : : > ; : ; ; 4 2pr > À cos h=2 cos h=2 þ 3 cos 3h=2 srh The shear stress in the bisector plane (h = 0°) follows from Eq.