Author
Heinz Kaufmann
Other affiliations: Technische Universität Darmstadt
Bio: Heinz Kaufmann is an academic researcher from Fraunhofer Society. The author has contributed to research in topics: Fatigue limit & Aluminium. The author has an hindex of 11, co-authored 74 publications receiving 543 citations. Previous affiliations of Heinz Kaufmann include Technische Universität Darmstadt.
Topics: Fatigue limit, Aluminium, Cast iron, Corrosion fatigue, Corrosion
Papers published on a yearly basis
Papers
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TL;DR: In this article, a new method for determining the stress-strain and strain-life curves retains the mathematical and physical relationships between the considered curves, by fitting the curve to experimental data points in a three-dimensional strain-stress-life space.
106 citations
TL;DR: In this article, the authors examined the fatigue properties of laser beam welded thin sheet aluminium and found that the cyclic strength of overlap joints with a slot weld is characterized by a two-dimensional crack-like notch between the sheets.
101 citations
58 citations
TL;DR: In this article, a proposal for the classification of some selected constructional materials starting from the material properties as assumed according to the models based on the Manson-Coffin-Basquin (MCB) and Ramberg-Osgood (RO) laws is presented.
31 citations
TL;DR: In this paper, the effect of axial and torsional load on the multiaxial fatigue behavior of laserbeam-welded overlapped tubular joints made from structural steel St35 (S235 G2T), artificially hardened aluminium alloy AlSi1MgMn T6 (EN AW 6082 T6) and self-hardening aluminium alloy Alloy AlMg3.5Mn (ENAW 5042) was investigated under combined proportional and non-proportional axial/torsional loading with constant amplitudes in the range
27 citations
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TL;DR: In this paper, the structural stress of seam-welded tensile-shear joints in thin-sheet steels and aluminium alloys is defined and set against design S-N curves.
229 citations
TL;DR: A probabilistic framework is proposed for fatigue life assessment of notched components under size effects, in which the Smith–Watson–Topper damage parameter is utilized to characterize the multiaxial stress state at the notch tip.
165 citations
TL;DR: In this paper, the principles and testing procedures of very high cycle fatigue tests and reports findings in the areas of crack formation, non-propagating small cracks, long crack propagation and thresholds are reported.
159 citations
Book•
05 Nov 2012
TL;DR: In this article, the notch stress approach for fatigue assessment of welded joints is based on the highest elastic stress at the weld toe or root, and a rounded shape with a reference radius is usually assumed.
Abstract: The notch stress approach for fatigue assessment of welded joints is based on the highest elastic stress at the weld toe or root. In order to avoid arbitrary or infinite stress results, a rounded shape with a reference radius, instead of the actual sharp toe or root, is usually assumed. Different proposals for reference radii exist, e.g. Radaj proposed a fictitious radius of 1 mm to consider micro-structural support effects for steel. The present guideline reviews different proposals for reference radii together with associated S-N curves. Detailed recommendations are given for the numerical analysis of the notch stress by the finite or boundary element method. Several aspects are discussed, such as the structural weakening by keyhole-shaped notches and the consideration of multiaxial stress states. Regarding the fatigue strength, appropriate S-N curves are presented for different materials. Finally, four examples illustrate the application of the approach, as well as the variety of structures that can be analysed and the scatter of results obtained from different models.
140 citations
TL;DR: In this paper, the allowable stresses for the fatigue design of welded joints are established according to the notch stress concept with the reference radii rref = 1.00 and 0.05 mm.
Abstract: In the literature, allowable stresses (FAT-values) for the fatigue design of welded joints are established according to the notch stress concept with the reference radii rref = 1.00 mm for thick connections (t ≥ 5 mm) and 0.05 mm for thin connections (t < 5 mm). However, it is not clear for which strength hypothesis they are valid. As local equivalent stresses may be calculated by the principal stress or von Mises hypotheses, it is necessary to distinguish between the applied hypotheses. The FAT-values according to the principal stress and von Mises hypotheses are compiled for steel, aluminium and magnesium for the reference radii rref = 1.00 and 0.05 mm. The allowable stresses are derived from normal as well as from shear stresses. However, the values derived from pure normal loading (axial or bending) and from pure torsion are not compatible when the principle stress or the von Mises hypotheses are applied. Therefore, in case of biaxial loading, the stated incompatibility between the values obtained from different loading modes should be overcome by the Gough-Pollard relationship.
131 citations