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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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References

Figures

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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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