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The effects of thermal cycling on matrix cracking and stiffness changes in composite tubesThe study investigated the accumulation of transverse matrix cracks and the resultant loss of torsional, extensional, and bending stiffnesses in 8 layer 0.5 in. diameter crossply tubes subjected to thermal cycling. The tubes were graphite-epoxy and the temperature range during cycling was -250 to 200 F. The effect of fiber and matrix properties was investigated through the use of T300 and P75S fibers and 934 and CE339 resins. The study considered 0, 10, 50, 100, 300, and 500 thermal cycles. Photomicrographs, X-rays, and edge replication were used to evaluate cracking. Special loading fixtures were used to measure stiffness changes. An important finding was that for the tubes studied, even with extensive cracking, the bending and extensional stiffnesses were not affected. The torsional stiffness, however, was strongly affected.
Document ID
19850055248
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Cohen, D.
(Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Hyer, M. W.
(Virginia Polytechnic Institute and State University Blacksburg, VA, United States)
Tompkins, S. S.
(NASA Langley Research Center Applied Materials, Branch, Hampton, VA, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1984
Subject Category
Composite Materials
Meeting Information
Meeting: National Technical Conference
Location: Albuquerque, NM
Start Date: October 9, 1984
End Date: October 11, 1984
Accession Number
85A37399
Funding Number(s)
CONTRACT_GRANT: NAG1-343
Distribution Limits
Public
Copyright
Other

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