Fatigue Reliability of Multidimensional Vibratory Degrading Systems under Random Loading
Publication: Journal of Engineering Mechanics
Volume 136, Issue 2
Abstract
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.
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Acknowledgments
This research was cofunded 75% from the European Union (European Social Fund), 25% from the Greek Ministry of Development (General Secretariat of Research and Technology), and from the private sector, in the context of measure 8.3 of the Operational Program Competitiveness (3rd Community Support Framework Program) under Grant No. (PENED 2003). This research was also partially funded by the Ministry of Science of the Republic of Poland. These supports are gratefully acknowledged.UNSPECIFIED
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Published In
Journal of Engineering Mechanics
Volume 136 • Issue 2 • February 2010
Pages: 179 - 188
Copyright
© 2010 ASCE.
History
Received: Oct 17, 2008
Accepted: Apr 17, 2009
Published online: Apr 23, 2009
Published in print: Feb 2010
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