Experimental and numerical investigations on crack initiation and crack growth under constant and variable amplitude loadings in the VHCF regime

  • Manuela SanderEmail author
  • C. Stäcker
  • T. Müller


For a fatigue strength assessment of safety-relevant components subjected to a very high number of cycles, it has to be considered that the fatigue limit is decreased and the crack initiation site is changed. Because the investigations in this field are mainly limited to constant amplitude loadings without mean stresses, within this research project experimental, numerical and analytical investigations are focused on the influences of variable amplitude loadings on the crack initiation site, the crack growth and the lifetime for a high-strength steel. Therefore, experiments with different repeated two-step loadings as well as standardized load-time-histories have been performed, which have different amounts of small amplitudes beneath the experimentally determined fatigue strength of the investigated material. In addition to the experimental results, complex elastic-plastic finite element simulations have been performed in order to investigate the influence of the mean stresses on the crack closure behaviour. Moreover, the experimental results are used to evaluate different analytical approaches for calculating fatigue lifetimes.


fatigue crack initiation crack growth variable amplitude loading mean stress effect crack closure very high cycle fatigue Palmgren-Miner rule 


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Copyright information

© Springer Fachmedien Wiesbaden GmbH, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Lehrstuhl für StrukturmechanikUniversität RostockRostockGermany

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