Actions for Measurements of displacement around holes in composite plates subjected to quasi-static compression

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Measurements of displacement around holes in composite plates subjected to quasi-static compression

Author
Post, D.
Published
May 31, 1982.
Physical Description
1 electronic document
Additional Creators
Czarnek, R., Duke, J. C., Jr., and Asundi, A.
Online Version

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Unclassified, Unlimited, Publicly available.
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Summary
Attempts to develop a whole-field, high sensitivity optical technque for measurement of load induced changes of thickness of composite plates are described. Graphite-epoxy plates of quasi-isotropic layup were used as test specimens. Changes of thickness of three plates, each with a central hole of different size, were measured as a function of applied compressive loads. The first test specimen showed localized zones where no holographic fringes were present, surrounded by zones of low fringe contrast. This was thought to be a result of localized motion or creep. Subsequent tests with an increased time interval between specimen loading and holographic exposure demonstrated no localized zones of absent fringes. No plausible explanation for radical differences in the quality of fringe patterns was found, although the use of specimens having a high quality mirrorized surface provided superior change of thickness patterns. Recommendations for further investigations and changes in test procedure are presented.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19820018836.
Accession ID: 82N26712.
NASA-CR-169084.
NAS 1.26:169084.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15715593