Effect of Crowning of Dovetail Joints on Turbine Blade Root Damping


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Stresses due to resonant vibrations induce fatigue damage in turbomachinery blades jeopardizing their structural integrity. Damping plays a fundamental role in passive control of resonant stresses. In the present work the effect of ‘crowning’ of dovetail joints on blade-root friction damping is for the first time investigated. In detail, the damping of a simplified blade is measured under varying centrifugal load for two different joint geometries: a customary dovetail attachment and a ‘crowned’ one. A theoretical model is developed to quantify the damping generated at the contact surfaces. Experimental results and analytical predictions are compared.



Edited by:

L. Garibaldi, C. Surace, K. Holford and W.M. Ostachowicz




M. Allara et al., "Effect of Crowning of Dovetail Joints on Turbine Blade Root Damping", Key Engineering Materials, Vol. 347, pp. 317-322, 2007

Online since:

September 2007




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