Reliability of Adhesive Bonds Under Severe Environments (1984) / Chapter Skim
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'APPENDIX III: Overview of Adhesion Science Program Review/Workshop at Virginia Polytechnic Institute and State University'
'APPENDIX III: Overview of Adhesion Science Program Review/Workshop at Virginia Polytechnic Institute and State University'
Pages 47-50
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From page 47... ...
Both solid state nuclear magnetic resonance (NMR) and dielectric measurements were shown to provide data of a more molecular nature and to be complimentary to the usual rheovibron information.
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From page 48... ...
The same techniques of C-scan, acoustic emission, X-ray radiography, thermography, and neutron radiography are useful for adhesively bonded joints. An important feature outlined was that NDE represents a total systems approach to flaw detection, quality control, flaw tolerance and damage growth, stress analysis, and lifetime prediction and is not limited to merely detecting flaws using a specific technique.
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From page 49... ...
The former discussed the need for cumulative damage concepts as well as NOT methods for composite bonded structures. The latter reviewed work at the Naval Air Development Center to assess joint durability under adverse environmental conditions using various surface treatments (alkaline peroxide, Pasa Jell, and silanes)
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From page 50... ...
The specimens were fatigueloaded, and in all cases failure occurred by debond growth. The total strain energy release rate, Gj, appeared to be the governing parameter, as opposed to either Gi or Using his previously developed explanation of damage growth in tapered double cantilever beam adhesively bonded specimens, Don Hunston of the National Bureau of Standards gave an explanation of why toughened epoxies are not as effective in increasing composite delamination tolerance as they are in increasing adhesive fracture toughness.
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