NDLI: The effect of resin toughness and modulus on compressive failure modes of quasi-isotropic graphite/epoxy laminates

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The effect of resin toughness and modulus on compressive failure modes of quasi-isotropic graphite/epoxy laminates

Content Provider	NASA Technical Reports Server (NTRS)
Author	Sohi, M. M. Hahn, H. T. Williams, J. G.
Copyright Year	1986
Description	Compressive failure mechanisms in quasi-isotropic graphite/epoxy laminates were characterized for both unnotched and notched specimens and also following damage by impact. Two types of fibers (Thornel 300 and 700) and four resin systems (Narmco 5208, American Cyanamid BP907, and Union Carbide 4901/MDA and 4901/mPDA) were studied. For all material combinations, failure of unnotched specimens was initiated by kinking of fibers in the 0-degree plies. A major difference was observed, however, in the mode of failure propagation after the 0-degree ply failure. The strength of quasi-isotropic laminates in general increased with increasing resin tensile modulus. The laminates made with Thornel 700 fibers exhibited slightly lower compressive strengths than did the laminates made with Thornel 300 fibers. The notch sensitivity as measured by the hole strength was lowest for the BP907 resin and highest for the 5208 resin. For the materials studied, however, the type of fiber had no effect on the notch sensitivity.
File Size	1902886
Page Count	47
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19860013176
Archival Resource Key	ark:/13960/t8z94460n
Language	English
Publisher Date	1986-03-01
Access Restriction	Open
Subject Keyword	Composite Materials Notch Sensitivity Fatigue Materials Compression Loads Delaminating Failure Modes Graphite-epoxy Composites Impact Damage Resin Matrix Composites Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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