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A number of investigators in the author's laboratory have successfully studied the correlation of nondestructive measurements and destructively determined mechanical properties. General work in this area has been going on since 1958 and specifically on graphite since early 1964. Accomplishments include nondestructive testing capability for predicting density in small discrete volumes of bulk graphite to better than ±1 per cent, Young's modulus to better than ±3 per cent, and ultimate tensile strength (all at room temperature) to better than ±10 per cent. Predictions can be made in five or six different aerospace (fine-grained) grades of graphite, for both with- and against-the-grain orientation, employing a single set of calibration curves. Experiments indicate the strong possibility of extension to other fine-grained graphites, including graphite composites containing additives such as silicon and zirconium diboride.
graphite, strength of materials, modulus, density, mechanical properties, ultrasonics, radiometry, nondestructive testing
Hastings, C. H.
Chief, NDT Evaluation Section, Avco Corp., Lowell, Mass.