NDLI: Damage-tolerance characteristics of composite fuselage sandwich structures with thick facesheets

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Damage-tolerance characteristics of composite fuselage sandwich structures with thick facesheets

Content Provider	NASA Technical Reports Server (NTRS)
Author	Ambur, Damodar R. McGowan, David M.
Copyright Year	1997
Description	Damage 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.
File Size	2114291
Page Count	40
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19970012661
Archival Resource Key	ark:/13960/t7bs3qp2h
Language	English
Publisher Date	1997-02-01
Access Restriction	Open
Subject Keyword	Composite Materials Keels Honeycomb Cores Deformation Sandwich Structures Residual Strength Finite Element Method Notch Sensitivity Tolerances Mechanics Graphite-epoxy Composites Composite Structures Damage Impact Damage Loads Forces Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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