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Analysis and test of superplastically formed titanium hat-stiffened panels under compressionFour hat-stiffened titanium panels with two different stiffener configurations were fabricated by superplastic forming/weld brazing and tested under a moderately heavy compressive load. The panels had the same overall dimensions but differed in the shape of the hat-stiffener webs; three panels had stiffeners with flat webs and the other panel had stiffeners with beaded webs. Analysis indicated that the local buckling strain of the flat stiffener web was considerably lower than the general panel buckling strain or cap buckling strain. The analysis also showed that beading the webs of the hat stiffeners removed them as the critical element for local buckling and improved the buckling strain of the panels. The analytical extensional stiffness and failure loads compared very well with experimental results.
Document ID
19870008686
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Davis, Randall C. (NASA Langley Research Center Hampton, VA, United States)
Royster, Dick M. (NASA Langley Research Center Hampton, VA, United States)
Bales, Thomas T. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1987
Subject Category
Structural Mechanics
Report/Patent Number
NASA-TM-88989
NAS 1.15:88989
Accession Number
87N18119
Funding Number(s)
PROJECT: RTOP 505-63-81-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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