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Fatigue reliability of multidimensional vibratory degrading systems under random loading / Sobczyk, Kazimierz in Journal of engineering mechanics, Vol. 136 N° 2 (Fevrier 2010) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 136 N° 2 (Fevrier 2010) . - pp. 179-188 Titre : Fatigue reliability of multidimensional vibratory degrading systems under random loading Type de document : texte imprimé Auteurs : Sobczyk, Kazimierz, Auteur ; Perros, Kyriakos, Auteur ; Papadimitriou, Costas, Auteur Article en page(s) : pp. 179-188 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Fatigue  Cracking  Vibration  System  reliability  Stiffness  Degradation  Random  Processes  Load  factors. Résumé : In this paper, the basic methodology for the fatigue reliability assessment of randomly vibrating multidegree-of-freedom systems is presented within the coupled response-degradation model. The fatigue process in the system components is quantified by the fatigue crack growth equations which—via the stress range—are coupled with the system response. Simultaneously, the system dynamics is affected by fatigue process via its stiffness degradation so that it provides the actual stress values to the fatigue growth equation. In addition to the general coupled response-degradation analysis, its special case of noncoupled fatigue crack growth is treated as well for the wide-band stationary applied stress by the use of its first four spectral moments and the approximate, empirically motivated, Dirlik's probability distribution for the stress range. Both, the general analysis and the illustrating exemplary problems elaborated in the paper provide the route to the fatigue reliability estimation in complex–hierarchical vibratory systems under random loading. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...] [article] Fatigue reliability of multidimensional vibratory degrading systems under random loading [texte imprimé] / Sobczyk, Kazimierz, Auteur ; Perros, Kyriakos, Auteur ; Papadimitriou, Costas, Auteur . - pp. 179-188. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 136 N° 2 (Fevrier 2010) . - pp. 179-188 Mots-clés : Fatigue  Cracking  Vibration  System  reliability  Stiffness  Degradation  Random  Processes  Load  factors. Résumé : In this paper, the basic methodology for the fatigue reliability assessment of randomly vibrating multidegree-of-freedom systems is presented within the coupled response-degradation model. The fatigue process in the system components is quantified by the fatigue crack growth equations which—via the stress range—are coupled with the system response. Simultaneously, the system dynamics is affected by fatigue process via its stiffness degradation so that it provides the actual stress values to the fatigue growth equation. In addition to the general coupled response-degradation analysis, its special case of noncoupled fatigue crack growth is treated as well for the wide-band stationary applied stress by the use of its first four spectral moments and the approximate, empirically motivated, Dirlik's probability distribution for the stress range. Both, the general analysis and the illustrating exemplary problems elaborated in the paper provide the route to the fatigue reliability estimation in complex–hierarchical vibratory systems under random loading. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...]