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Damage-Tolerance Characteristics of Composite Fuselage Sandwich Structures with Thick FacesheetsDamage tolerance characteristics and results from experimental and analytical studies of a composite fuselage keel sandwich structure subjected to low-speed impact damage and discrete-source damage are presented. The test specimens are constructed from graphite-epoxy skins borided to a honeycomb core, and they are representative of a highly loaded fuselage keel structure. Results of compression-after-impact (CAI) and notch-length sensitivity studies of 5-in.-wide by 10-in.long specimens are presented. A correlation between low-speed-impact dent depth, the associated damage area, and residual strength for different impact-energy levels is described; and a comparison of the strength for undamaged and damaged specimens with different notch-length-to-specimen-width ratios is presented. Surface strains in the facesheets of the undamaged specimens as well as surface strains that illustrate the load redistribution around the notch sites in the notched specimens are presented and compared with results from finite element analyses. Reductions in strength of as much as 53.1 percent for the impacted specimens and 64.7 percent for the notched specimens are observed.
Document ID
19970012661
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
McGowan, David M. (NASA Langley Research Center Hampton, VA United States)
Ambur, Damodar R. (NASA Langley Research Center Hampton, VA United States)
Date Acquired
September 6, 2013
Publication Date
February 1, 1997
Subject Category
Composite Materials
Report/Patent Number
NAS 1.15:110303
NASA-TM-110303
Meeting Information
Meeting: Fibrous Composites In Structural Design
Location: Forth Worth, TX
Country: United States
Start Date: August 26, 1996
End Date: August 29, 1996
Sponsors: Federal Aviation Administration, Department of Defense, NASA Langley Research Center
Accession Number
97N16907
Funding Number(s)
PROJECT: RTOP 538-10-11-05
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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