NDLI: Physical aging in graphite epoxy composites

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Physical aging in graphite epoxy composites

Content Provider	NASA Technical Reports Server (NTRS)
Author	Kong, E. S. W.
Copyright Year	1981
Description	The matrix dominated mechanical behavior of a graphite epoxy composite was found to be affected by sub Tg annealing. Postcured + or - 45 deg 4S specimens of Thornel 300 graphite/Narmco 5208 epoxy were quenched from above Tg and given a sub Tg annealing at 140 C for times up to 10 to the 5th power min. The ultimate tensile strength, strain to break, and toughness of the composite material were found to decrease as functions of sub Tg annealing time. No weight loss was observed during the sub Tg annealing. The time dependent change in mechanical behavior is explained on the basis of free volume changes that are related to the physical aging of the nonequilibrium glassy network epoxy. The results imply possible changes in composite properties with service time.
File Size	869593
Page Count	26
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19810012605
Archival Resource Key	ark:/13960/t0zp8vb07
Language	English
Publisher Date	1981-04-01
Access Restriction	Open
Subject Keyword	Composite Materials Quenching Cooling Prepregs Time Dependence Annealing Carbon Fibers Transition Temperature Aging Materials Mechanical Properties Graphite-epoxy Composites Amorphous Materials Matrix Materials 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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