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To demonstrate that the Charpy impact test is truly a reproducible test, a special heat of steel cut up to provide 18,000 blanks and heat treated to three energy levels was obtained by the Watertown Arsenal Laboratory. Two hundred specimens at each energy level were tested in Charpy machines manufactured by two different companies to obtain the deviation and average energy values. The remainder of the specimens are being used to check Charpy impact machines throughout the country to determine the causes of the variations encountered. Charts of some of the results obtained are shown and discussed.
Driscoll, David E.
Chief, Watertown Arsenal, Watertown, Mass.