The burst of a disc in rotating machinery can cause catas- trophic damage of the equipment and, more importantly, it can represent a mortal threat to anyone in the sphere of influence of the event. In order to minimize the danger associated to a rotating component failure, burst testing is required by the au- thorities in order to set safety margins to the normal operating speeds. Moreover more accurate predicting tools are required for designing the components. This paper presents the results of a numerical and analytical study on the assessment of the crack driving force for discs containing surface flaws. The aim is to provide a simple, though reliable, tool in order to be able to calculate the possible dangerous in-service speed for a rotating component and, therefore, to set burst margins above the nor- mal operating conditions of the equipment. An R6-like flaw as- sessment procedure is adopted considering different assumptions in the definition of the critical speed and the analytical predic- tions are compared with the results of elastic-plastic finite ele- ment analysis of disc. In particular, the validity and potentiality of the method is proved for surface flaws in different positions in the disc.
CRITICAL SPEED OF FLAWED ROTORS: GLOBAL VS. LOCAL APPROACH
SCOLAVINO, LUIGI;BERETTA, STEFANO;
2014-01-01
Abstract
The burst of a disc in rotating machinery can cause catas- trophic damage of the equipment and, more importantly, it can represent a mortal threat to anyone in the sphere of influence of the event. In order to minimize the danger associated to a rotating component failure, burst testing is required by the au- thorities in order to set safety margins to the normal operating speeds. Moreover more accurate predicting tools are required for designing the components. This paper presents the results of a numerical and analytical study on the assessment of the crack driving force for discs containing surface flaws. The aim is to provide a simple, though reliable, tool in order to be able to calculate the possible dangerous in-service speed for a rotating component and, therefore, to set burst margins above the nor- mal operating conditions of the equipment. An R6-like flaw as- sessment procedure is adopted considering different assumptions in the definition of the critical speed and the analytical predic- tions are compared with the results of elastic-plastic finite ele- ment analysis of disc. In particular, the validity and potentiality of the method is proved for surface flaws in different positions in the disc.File | Dimensione | Formato | |
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