Definition of autofrettage in English:

autofrettage

noun

  • The process of strengthening a tube, especially a gun barrel, by subjecting it to internal pressure high enough to enlarge the bore and push the inner metal (but not the outer metal) beyond its elastic limit.

Origin

Early 20th century. From auto- + frettage, after French autofrettage.

Pronunciation

autofrettage

/ˈɔːtə(ʊ)ˌfrɛtɪdʒ//ˌɔːtə(ʊ)frɛˈtɑːʒ/