Scratch Diamond Test

Michel Coulon

doi:10.1117/12.952455

9 May 1986 Scratch Diamond Test

Michel Coulon

Proceedings Volume 0601, Ophthalmic Optics; (1986) https://doi.org/10.1117/12.952455
Event: 1985 International Technical Symposium/Europe, 1985, Cannes, France

Abstract

During its use, a spectacle lens is subjected to numerous different abrasive conditions (e.g. cleaning ; wipping) which make two types of surface scratches : Viscoelastic and brittle scratches. We present here a scratch testing machine (rayoscope) and a scratch diamond test which allows to reproduce these two kinds of scratches and to caracterize the material by : - The "scratch rupture resistance" which is equal to the load, called critical load Cc, applied on a known penetrator, at which begins the chips formation. - The "scratchability curve" which expresses the whole behaviour of the material until the critical load value Cc and which is obtained by recording the scratch width as a function of the load. The scratch resistance R then equals Cc/∝B where ∝= slope of the asymptote of the curve B = ordinate at the origin of the asymptote Cc= critical load The scratch resistance values are in good correlation with the wearing test results.

Citation Download Citation

Michel Coulon "Scratch Diamond Test", Proc. SPIE 0601, Ophthalmic Optics, (9 May 1986); https://doi.org/10.1117/12.952455

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