journal article·2021-01Open access

Variable amplitude very high cycle fatigue of 17-4PH steel with a stepwise S-N curve

Bernd M. Schönbauer, Michael Fitzka, Ulrike Karr, Herwig Mayer

Abstract

High and very high cycle fatigue (VHCF) tests were performed with 17-4PH stainless steel under constant amplitude (CA) and variable amplitude (VA) loading at load ratios of −1 and 0.05. Stepwise (duplex) S-N curves were determined with failure from surface inclusions above the transition stress amplitude, σtr, and from the interior below σtr. Similar σtr for CA and VA loading were found. VA failure occurred at Miner damage sums between 0.1 and 0.9 (surface failure) and 0.2 and 2.2 (internal failure). Omission of stress amplitudes less than 60% of the maximum amplitude is allowable for VA studies in the VHCF regime.
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Research context

OpenAlex topics: Fatigue and fracture mechanics · Fire effects on concrete materials · High Temperature Alloys and Creep

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