TECHNICAL PAPERS: Gas Turbines: Aircraft Engine

Unique Challenges for Bolted Joint Design in High-Bypass Turbofan Engines

[+] Author and Article Information
Robert P. Czachor

Chief Consulting Engineer, Structures, GE Aircraft Engines, One Neumann Way, Cincinnati, Ohio 45215e-mail: robert.czachor@ae.ge.com

J. Eng. Gas Turbines Power 127(2), 240-248 (Apr 15, 2005) (9 pages) doi:10.1115/1.1806453 History: Received October 01, 2002; Revised March 01, 2003; Online April 15, 2005
Copyright © 2005 by ASME
Topics: Engines , Stress , Flanges , Design
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Brickford, J. H., 1995, An Introduction to the Design and Behavior of Bolted Joints, 3rd ed., Marcel Decker, Inc., pp. 422–457.
ASME Boiler and Pressure Vessel Code, Section VIII, Division 1, Appendix 2.
Schneider,  R. W., 1968, “Flat Face Flanges With Contact Beyond the Bolt Circle,” ASME J. Eng. Power, 90(1), pp. 82–88.


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Structural bolted joints in a typical turbofan engine
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Neutral axis shift mechanism for overturning moment loading
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The joint diagram for a lever flange at high load levels
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Empirical multiplier for bolt capability under OTM load
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Typical component test set-up
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Component test flange failures
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Comparison of empirical predictions for flange failure with component test results
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Simple plate-beam model used for prediction of bolt OTM capability
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Complex model required for accurate prediction of flange capability
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LS-DYNA® analysis of a bolted joint in the vicinity of a blade impact on the adjacent casing
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Lever flange joint geometry
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Representation of thermal and Poissions mechanism for a bolted joint



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