[article]
| Titre : |
Probabilistic treatment of crack nucleation and growth for gas turbine engine materials |
| Type de document : |
texte imprimé |
| Auteurs : |
M. P. Enright, Auteur ; R. C. McClung, Auteur ; S. J. Hudak, Auteur |
| Année de publication : |
2011 |
| Article en page(s) : |
08 p. |
| Note générale : |
Génie Mécanique |
| Langues : |
Anglais (eng) |
| Mots-clés : |
Fatigue cracks Gas turbines Jet engines Nucleation |
| Index. décimale : |
620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux |
| Résumé : |
The empirical models commonly used for probabilistic life prediction do not provide adequate treatment of the physical parameters that characterize fatigue damage development. For these models, probabilistic treatment is limited to statistical analysis of strain-life regression fit parameters. In this paper, a model is proposed for life prediction that is based on separate nucleation and growth phases of total fatigue life. The model was calibrated using existing smooth specimen strain-life data, and it has been validated for other geometries. Crack nucleation scatter is estimated based on the variability associated with smooth specimen and fatigue crack growth data, including the influences of correlation among crack nucleation and growth phases. The influences of crack nucleation and growth variability on life and probability of fracture are illustrated for a representative gas turbine engine disk geometry. |
| DEWEY : |
620.1 |
| ISSN : |
0742-4795 |
| En ligne : |
http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ00013 [...] |
in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 132 N° 8 (Août 2010) . - 08 p.
[article] Probabilistic treatment of crack nucleation and growth for gas turbine engine materials [texte imprimé] / M. P. Enright, Auteur ; R. C. McClung, Auteur ; S. J. Hudak, Auteur . - 2011 . - 08 p. Génie Mécanique Langues : Anglais ( eng) in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 132 N° 8 (Août 2010) . - 08 p.
| Mots-clés : |
Fatigue cracks Gas turbines Jet engines Nucleation |
| Index. décimale : |
620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux |
| Résumé : |
The empirical models commonly used for probabilistic life prediction do not provide adequate treatment of the physical parameters that characterize fatigue damage development. For these models, probabilistic treatment is limited to statistical analysis of strain-life regression fit parameters. In this paper, a model is proposed for life prediction that is based on separate nucleation and growth phases of total fatigue life. The model was calibrated using existing smooth specimen strain-life data, and it has been validated for other geometries. Crack nucleation scatter is estimated based on the variability associated with smooth specimen and fatigue crack growth data, including the influences of correlation among crack nucleation and growth phases. The influences of crack nucleation and growth variability on life and probability of fracture are illustrated for a representative gas turbine engine disk geometry. |
| DEWEY : |
620.1 |
| ISSN : |
0742-4795 |
| En ligne : |
http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ00013 [...] |
|
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