autofrettage

noun

au·​to·​fret·​tage

ˈȯ-tō-ˌfre-tij

plural -s

: the application of such interior pressure to the bore of a heavy ordnance gun as will deform the inner layers of steel beyond the elastic limit that would be reached by the explosion of any charge to be used subsequently in the gun

Word History

Etymology

probably from French, from aut- + frettage

First Known Use

1919, in the meaning defined above

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