Digital Repository, Giornata IGF Forni di Sopra (UD) 2011

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Fatigue crack closure: from LCF to small scale yielding
R. Pippan, W. Grosinger

Last modified: 2011-02-25


Crack closure has been one of the research topics in the 1980ies and 1990ies. A vast number of
papers have been published in this area. However, most of the research work has been devoted to crack
propagation under small scale yielding. In this presentation, the different length scale from micro-crack to long
cracks and different loading conditions (from low cycle fatigue, LCF, to small scale yielding) affecting crack
closure and as a consequence, the near crack tip stress and strain fields are considered. The main focus is on
LCF crack closure behaviour which is studied by in-situ scanning electron microscopy. The results demonstrate
the importance of crack closure for the explanation of the LCF behaviour. The change of crack closure from
LCF to high cycle fatigue and their consequences for lifetime prediction will be discussed.

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