NDLI: Fatigue degradation in compressively loaded composite laminates. [graphite-epoxy composites

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Fatigue degradation in compressively loaded composite laminates. [graphite-epoxy composites

Content Provider	NASA Technical Reports Server (NTRS)
Author	Ramkumar, R. L.
Copyright Year	1981
Description	The effect of imbedded delaminations on the compression fatigue behavior of quasi-isotropic, T300/5208, graphite/epoxy laminates was investigated. Teflon imbedments were introduced during panel layup to create delaminations. Static and constant amplitude (R=10, omega = 10 Hz) fatigue tests were conducted. S-N data and half life residual strength data were obtained. During static compression loading, the maximum deflection of the buckled delaminated region was recorded. Under compression fatigue, growth of the imbedded delamination was identified as the predominant failure mode in most of the test cases. Specimens that exhibited others failures had a single low stiffness ply above the Teflon imbedment. Delamination growth during fatigue was monitored using DIB enhanced radiography. In specimens with buried delaminations, the dye penetrant (DIB) was introduced into the delaminated region through a minute laser drilled hole, using a hypodermic needle. A low kV, microfocus, X-ray unit was mounted near the test equipment to efficiently record the cyclic growth of buried delaminations on Polaroid film.
File Size	12703976
Page Count	158
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19810014659
Archival Resource Key	ark:/13960/t1hj1bq62
Language	English
Publisher Date	1981-04-01
Access Restriction	Open
Subject Keyword	Composite Materials Photographic Recording Radiography Dyes Deflection Failure Analysis Fatigue Materials Compression Loads Delaminating Experiment Design Graphite-epoxy Composites S-n Diagrams Teflon Trademark 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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