▪ I. frettage1
(ˈfrɛtɪdʒ)
[a. Fr. frettage, f. fretter to ring, f. frette fret n.5]
a. The process of shrinking on rings of metal about the breech of a gun to give additional strength. b. The collection of rings thus employed.
| 1882 Rep. Chief of Ordnance 244 (Cent.) The gun..ordinarily receives an exterior frettage. |
▪ II. frettage2
(ˈfrɛtɪdʒ)
[f. fret v.1 + -age.]
= fretting vbl. n.1 1 c; frettage corrosion, fretting corrosion.
| 1938 Times 29 June 11/3 The Engineering Department itself is attacking the puzzling problem of ‘frettage corrosion’, which, when vibration is present, causes a fine reddish-brown dust to appear between surfaces usually regarded as fitting so tightly that no relative movement is possible. 1960 U. R. Evans Corrosion & Oxidation of Metals xviii. 738 In aircraft, frettage has been found between plates of bolted or riveted assemblages. Ibid., The presence of oxygen..increases damage due to frettage, which in presence of oxygen is called fretting oxidation or fretting corrosion. |