Download Advanced Methods of Fatigue Assessment by Dieter Radaj, Michael Vormwald PDF

By Dieter Radaj, Michael Vormwald

In 5 chapters, this quantity offers fresh advancements in fatigue evaluation. within the first bankruptcy, a generalized Neuber suggestion of fictitious notch rounding is gifted the place the microstructural aid components rely on the notch beginning perspective along with the loading mode. the second one bankruptcy specifies the notch pressure issue together with the tension power density and J-integral thought whereas the SED procedure 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 sector and discusses motive force parameters. The final bankruptcy discusses thermomechanical fatigue, tension, and pressure ranges.

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In the case of pointed notches, an adjustment is necessary. The stress multiaxiality at the pointed notch, analysed by the FE method in the following, deviates from the stress multiaxiality at the corresponding fictitiously rounded notch, also analysed by the FE method. Therefore, the jump factor j has to be introduced when evaluating the von Mises or Beltrami equivalent notch stresses or the corresponding stress concentration factors. The effective stress concentration factor K t has to be compared with the modified stress concentration factor Kt(qf)/j, because j was not taken into account in the s values directly according to Eq.

As demonstrated by the parametric investigation of pointed V-notch specimens (q = 0) subjected to tensile loading, the plateau values of s combined with the jump factor j are well suited for engineering usage in structural strength 28 1 Generalised Neuber Concept of Fictitious Notch Rounding assessments. These s values are ready for incorporation in those codes and design recommendations for structural components under static or cyclic loading conditions (brittle or fatigue fracture) which comprise local approaches such as the notch stress or notch strain approach.

The notch stress situation is considered hereafter in the order of elliptical notches, parabolic notches and keyhole notches. The V-notches are dealt with further below. 4 Elliptical Notch Subjected to In-Plane Shear Loading Surprisingly enough, no solution for the elliptical hole in the infinite plate subjected to pure in-plane shear loading was originally available from the literature. Neuber had solved the more complicated case of shear-bending loading of an infinite plate strip with an elliptical hole, Fig.

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