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Heat-Pulse Measurements Reveal Fiber Volume FractionsMeasurements of thermal diffusivities by heat-pulse method constitutes basis of noncontact, nondestructive method of determining fiber volume fractions (FVFs) of samples of composite (matrix/fiber) materials. Modulated radiant heat applied to sample, while resulting modulated infrared emitted is monitored. Phase shift between two modulations indicative of thermal diffusivity and fiber volume fraction of sample. Testing method takes less time, provides data to characterize sample through its thickness, and amenable to scanning for global determination of gradual spatial variations in FVF along sample.
Document ID
19940000626
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Winfree, William P.
(NASA Langley Research Center, Hampton, VA.)
Zalameda, Joseph N.
(Army Research Laboratory)
Date Acquired
August 16, 2013
Publication Date
November 1, 1994
Publication Information
Publication: NASA Tech Briefs
Volume: 18
Issue: 11
ISSN: 0145-319X
Subject Category
Physical Sciences
Report/Patent Number
LAR-15126
Accession Number
94B10626
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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