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The structure of electro-deposited chromium. A correction

1944; Royal Society; Volume: 182; Issue: 991 Linguagem: Inglês

10.1098/rspa.1944.0015

2053-9169

William Hume-Rothery, M. R. J. Wyllie,

Metal and Thin Film Mechanics

In our recent paper (Hume-Rothery & Wyllie 1943) on the structure of electrodeposited chromium, figures were given for the stress in electro-deposits prepared on steel strip. These figures were deduced by means of an equation given by Stoney (1909) for the relation between the radius of curvature of the steel strip and the stress in the deposit. According to Stoney the radius of curvature, R , of a strip of length l is related to the deflexion of the strip, z , by the equation R = l 2 /8z. In our work, we assumed that if the strip were held at one end, during electrodeposition, the deflexion was the movement of the free end. Actually, as can be seen from figure 1, if zis the movement of the free end of the rod, then for small deflexions R = l 2 /2z If the deflexion is defined as the perpendicular distance from the mid-point of the rod to the chord of the circle joining its two ends, i.e. the distance y in figure 1, then the relation is R = l 2 /8 y , which is that given by stoney.