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Communication Dans Un Congrès Année : 2013

Lifetime modelling of fatigue crack initiation from casting defects

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1
Luc Rémy
  • Fonction : Auteur
Alain Köster

Résumé

The lifetime to initiate an engineering crack in a component is usually predicted from Coffin-Manson curves using smooth specimens for low-cycle fatigue. However this procedure has to be examined carefully when cracks initiate from defects, such as inclusions or pores that are inherited from the manufacturing process. A special methodology has been developed for defects occurring in turbine discs made from powder metallurgy nickel base superalloys [1-3]. A probabilistic life prediction model was so built combining measurements of the distribution of defect size and a simple fracture mechanics approach to assess small crack growth, as done by Murakami [4] for high cycle fatigue. A key issue is to know whether defects should be considered as cracks of equivalent area. The investigation carried out in [1] has shown that this approximation was effective in describing fatigue life under small scale yielding.
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Dates et versions

hal-00822184 , version 1 (14-05-2013)

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  • HAL Id : hal-00822184 , version 1

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Marion Geuffrard, Luc Rémy, Alain Köster. Lifetime modelling of fatigue crack initiation from casting defects. International conference on fracture, Jul 2009, Ottawa, Canada. 10 p. ⟨hal-00822184⟩
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