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Conference papers
Lifetime modelling of fatigue crack initiation from casting defects
Abstract : 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.
Cited literature [18 references]
https://hal-mines-paristech.archives-ouvertes.fr/hal-00822184
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Submitted on : Tuesday, May 14, 2013 - 2:15:49 PM
Last modification on : Wednesday, November 17, 2021 - 12:28:05 PM
Long-term archiving on: : Tuesday, April 4, 2017 - 6:57:20 AM
Contributor : Bibliothèque Umr7633 Connect in order to contact the contributor
Submitted on : Tuesday, May 14, 2013 - 2:15:49 PM
Last modification on : Wednesday, November 17, 2021 - 12:28:05 PM
Long-term archiving on: : Tuesday, April 4, 2017 - 6:57:20 AM
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