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that toughness, 1

Fig. 9. — Left side of keyseat.
[cropped to clean ellipse]
illustrating Samuel L. Hoyt. “Static, dynamic, and notch toughness.” Transactions of the American Institution of Mining and Metallurgical Engineers 62 (1920) : 476-496
University of California copy, digitized October 31, 2012

...that toughness, like hardness or tensile strength, should be regarded as an independent property...   p 476

note —
key seat and key shaft together form a key : a machine element used to connect a rotating machine element to a shaft   wikipedia

13 January 2015

metallurgy; toughness; rapture; rounds
S. L. Hoyt, “Static, dynamic, and notch toughness” (1920)