Dovetail attachments in gas turbines are subject to fatigue failures. These fatigue failures occur as a result of large fluctuations in hoop stresses near the edges of contact in attachments. The high hoop stresses available for fluctuating are, in turn, the result of high contact stress peaks near the edges of contact. One means of alleviating these stresses is via crowning. Such crowned configurations are inherently three-dimensional and consequently present some challenges to obtaining convergent contact stresses with finite elements. Such challenges are met in the work of Beisheim and Sinclair (2008, “Three-Dimensional Finite Element Analysis of Dovetail Attachments With and Without Crowning,” ASME J. Turbomach., 130, pp. 021012-1–021021-8), and crowning is shown to reduce contact stresses by about 40%. The crowning profile used in that paper is the natural Hertzian profile of a segment of an ellipsoid. This note investigates an alternative profile with a view to increasing the area of contact, and thereby further reducing contact stresses. Converged contact stresses are obtained for both profiles, and demonstrate that the alternative profile can indeed reduce contact stresses by an additional 10%.
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June 2010
Technical Briefs
Improved Three-Dimensional Crowning Profiles for Dovetail Attachments
J. R. Beisheim,
J. R. Beisheim
Development Group,
ANSYS Inc.
, Canonsburg, PA 15317
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G. B. Sinclair
G. B. Sinclair
Department of Mechanical Engineering,
Louisiana State University
, Baton Rouge, LA 70803
Search for other works by this author on:
J. R. Beisheim
Development Group,
ANSYS Inc.
, Canonsburg, PA 15317
G. B. Sinclair
Department of Mechanical Engineering,
Louisiana State University
, Baton Rouge, LA 70803J. Eng. Gas Turbines Power. Jun 2010, 132(6): 064504 (4 pages)
Published Online: March 30, 2010
Article history
Received:
April 14, 2009
Revised:
May 7, 2009
Online:
March 30, 2010
Published:
March 30, 2010
Citation
Beisheim, J. R., and Sinclair, G. B. (March 30, 2010). "Improved Three-Dimensional Crowning Profiles for Dovetail Attachments." ASME. J. Eng. Gas Turbines Power. June 2010; 132(6): 064504. https://doi.org/10.1115/1.4000142
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