MANUFACTURING RESEARCH INVESTIGATION - NON DESTRUCTIVE TESTING, INSPECTION - PYROLYTIC GRAPHITE
LOCKHEED MISSILES AND SPACE CO INC SUNNYVALE CA
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This investigation objectively extends certain non-destructive test methods to include pyrolytic graphite as one of the newer materials that can be readily examined by these methods. Each of the methods used is described and basic concepts relatedto the apparatus and technique involved are reviewed. Conclusions are as follows 1 penetrant inspection is a rapid method of deter mining connected surface structure discontinui ties 2 the sonic method is not a reliable technique for locating internal flaws 3 ultra sonic examination is the optimum method for determination of internal discontinuities 4 radiography is the optimum method for nodule characteristics and micro-structure determina tion 5 the X-ray diffraction method is the optimum method for internal stress evaluations 6 the Eddy-Current method is the optimum for determination of parallelism of layer planes and 7 thermal gradient methods, for use on pyrolytic graphite examinations, are not yet sufficiently developed. Results appear encouraging.
- Ceramics, Refractories and Glass