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Fatigue life of welded high-strength steels under Gaussian loads

: Möller, Benjamin; Wagener, Rainer; Hrabowski, Jennifer; Ummenhofer, Thomas; Melz, Tobias

Postprint (PDF; )

Procedia Engineering 101 (2015), pp.293-301
ISSN: 1877-7058
International Conference on Material and Component Performance under Variable Amplitude Loading (VAL) <3, 2015, Prague>
Journal Article, Conference Paper, Electronic Publication
Fraunhofer LBF ()
low cycle fatigue; high-strength fine-grained steels; Gaussian load spectra; Palmgren-Miner-Elementary; material fatigue

Within the scope of the investigation of welded high-strength steels for application in crane structures, a Gaussian-like test spectrum is derived from an analysis of recorded load time histories. In addition to stress-controlled fatigue tests under constant amplitude loading, the test spectrum is used for the experimental investigation of MAG-welded butt joints and tubular sample components under variable amplitude loading. A linear damage accumulation using Palmgren-Miner-Elementary is conservative for a damage sum of D = 0.5. Application of the theoretical damage sum Dth = 1 results in a closer approximation of the Gaßner-curve. For further improvement of this approximation, a rotation of the calculated Gaßner-curve, i.e. a variable damage sum, is suggested for both butt joints and sample components.