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ASTM Selected Technical Papers
Nondestructive Evaluation and Flaw Criticality for Composite Materials
By
SV Kulkarni,
SV Kulkarni
3
University of Delaware
, coeditor
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WW Stinchcomb
WW Stinchcomb
4
University of Delaware
, coeditor
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ISBN-10:
0-8031-0527-4
ISBN:
978-0-8031-0527-0
No. of Pages:
366
Publisher:
ASTM International
Publication date:
1979
eBook Chapter
Moisture-Induced Surface Damage in T300/5208 Graphite/Epoxy Laminates
By
CD Shirrell
,
CD Shirrell
1
senior research engineer
, Polymers Department, General Motors Research Laboratories, General Motors Technical Center
, Warren, Mich
. 48090
.
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WH Leisler
,
WH Leisler
2
Engineering technician and aerospace engineer
, Structural Mechanics Division, Air Force Flight Dynamics Laboratory, Wright-Patterson Air Force Base
, Ohio 45433
.
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FA Sandow
FA Sandow
2
Engineering technician and aerospace engineer
, Structural Mechanics Division, Air Force Flight Dynamics Laboratory, Wright-Patterson Air Force Base
, Ohio 45433
.
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Page Count:
14
-
Published:1979
Citation
Shirrell, C, Leisler, W, & Sandow, F. "Moisture-Induced Surface Damage in T300/5208 Graphite/Epoxy Laminates." Nondestructive Evaluation and Flaw Criticality for Composite Materials. Ed. Pipes, R, Scott, W, Kulkarni, S, & Stinchcomb, W. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959 : ASTM International, 1979.
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A microscopic examination of hygrothermally expsoed T300/5208 cross-ply laminates is described. Moisture-induced surface and edge microcracks were observed in specimens exposed at 82° and 9, 20, 37, 74, and 91 percent relative humidity or water immersion. Specimens exposed at similar relative humidities but at lower temperatures (21, 43, and 63°C) generally did not form microcracks.
The severity and frequency of the microcracking at 82°C increased with relative humidity. The majority of the microcracks were observed to be oriented parallel to the graphite fibers in the surface laminae. Specimens with extensive microcracks were also observed to exhibit non-Fickian diffusion phenomena during their hygrothermal exposure.
References
1.
Shirrell
, C. D.
in Advanced Composite Materials—Environmental Effects, ASTM STP 658
, American Society for Testing and Materials
, 1977
, pp. 21–42.2.
Shirrell
, C. D.
in Selective Application of Materials for Products and Energy
, Society for Advancement of Material and Process Engineering
, 1978
, pp. 175–191.3.
(a)
Shirrell
, C. D.
, “Moisture Absorption by T300/5208 Graphite-Epoxy Composite Laminates
,” AFFDL-TM-78-75-FBS, Air Force Flight Dynamics Laboratory, Wright-Patterson AFB
, Ohio, in press. (b)Shirrell
, C. D.
, “Moisture Sorption by T300/5208 Graphite-Epoxy Composite Laminates
,” AFFDL Technical Memorandum, Air Force Flight Dynamics Laboratory, Wright-Patterson AFB
, Ohio, in preparation; (c)Shirrell
, C. D.
, “Kinetics of Moisture Diffusion in T300/5208 Graphite-Epoxy Composite Laminates
,” AFFDL Technical Report, Air Force Flight Dynamics Laboratory, Wright-Patterson AFB
, Ohio, in preparation;4.
Cook
, W. G.
and Downhill
, A. G.
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, E. H.
, and Spurr
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, W. J.
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, American Society for Testing and Materials
, 1969
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, R. J.
and O'Neal
, J. E.
, Journal of Materials Science
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, R. J.
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, American Chemical Society, Division of Organic Coatings and Plastics Chemistry Preprints
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McKague
, E. L.
, “Life Assurance of Composite Structures
,” Technical Report AFML-TR-75-51, Air Force Materials Laboratory, Wright-Patterson AFB
, Ohio, 1975
.12.
Browning
, C. E.
, “The Mechanism of Elevated Temperature Property Losses in High Performance Structural Epoxy Resin Matrix Materials After Exposure to High Humidity Environments
,” Ph.D. dissertation, University of Dayton
, Dayton, Ohio, 08
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.13.
Hedrick
, I. G.
and Whiteside
, J. B.
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,” American Institute of Aeronautics and Astronautics Conference on Aircraft Composites: The Emerging Methodology for Structural Assurance, Paper No. 77-473, San Diego, Calif.
, 24–25 March 1977.
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