Stress distribution and deformation in a twisted blade under combined tension and torsion

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Author
Hogan, Lawrence Miles
Date
1966-05Advisor
Gawain, Theodore H.
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Show full item recordAbstract
A theoretical and experimental investigation of the stress distribution
and deformation of twisted blades under combined tension and
torsion was conducted by LCDR Lawrence M. Hogan, USN, at the Aeronautical
Engineering Department of the U. S. Naval Postgraduate School,
Monterey, California. Theoretical expressions were developed to relate
the deformation of a twisted "blade" of rectangular cross section and
constant rate of twist to an applied load and moment. These expressions
were found to be linear for the rates of twist investigated and depended
only on the blade material and geometry. The theoretical strain distribution
was found to be essentially parabolic across the chord, with the
shape determined by the initial twist rate and the angular deformation. The experimental investigation was conducted with three specimens
of constant cross sectional aspect ratio but different rates of twist.
Correlation with theory was found to be excellent for the chordwise distribution
of strain and generally good for the linear relationships
linking the deformation with the applied loads. Recommendations were
made for areas of further investigation.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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