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Cross-sectional examination of the damage zone in impacted specimens of carbon/epoxy and carbon/PEEK compositesDrop weight impact testing was utilized to inflict damage on eight-ply bidirectional and unidirectional samples of carbon/epoxy and carbon/PEEK (polyetheretherketone) test specimens with impact energies ranging from 0.80 J to 1.76 J. The impacting tip was of a smaller diameter (4.2-mm) than those used in most previous studies, and the specimens were placed with a diamond wheel wafering saw through the impacted area perpendicular to the outer fibers. Photographs at 12 x magnification were taken of these cross-sections and examined. The results on the bidirectional samples show little damage until 1.13 J, at which point delaminations were seen in the epoxy specimens. The PEEK specimens showed less delamination than the epoxy specimens for a given impact energy level. The unidirectional specimens displayed more damage than the bidirectional samples for a given impact energy, with the PEEK specimens showing much less damage than the epoxy material.
Document ID
19900011809
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Nettles, A. T. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Magold, N. J. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
September 6, 2013
Publication Date
February 1, 1990
Subject Category
Composite Materials
Report/Patent Number
NASA-TM-100391
NAS 1.15:100391
Accession Number
90N21125
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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