ICAMS / Interdisciplinary Centre for Advanced Materials Simulation
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Mechanisms and modelling of fatigue crack growth under combined low and high cycle fatigue loading

Date: 15.12.2009
Place: UHW 11/1102

Christoph Schweizer, Abteilung Lebensdauerkonzepte, Thermomechanik, Fraunhofer-Institut f. Werkstoffmechanik IWM, Freiburg, Germany

The evolution of microcracks in a 10%-chromium steel is followed with the replica technique for pure low cycle fatigue (LCF) and combined LCF and high cycle fatigue (HCF) loading conditions. The superimposed HCF-cycles lead to accelerated fatigue crack growth rates, as soon as a certain crack length is reached. A mechanism based model is presented, which accounts for this e ffect and only needs one single fitting parameter. The model is used to predict fatigue lives at high temperatures and under thermomechanical fatigue loading conditions.

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