Author(s)

F. Osterstock & B. Legendre

Abstract

Use is made of the domain of stable extension of the Vickers indentation crack system in order to investigate both the thermal shock resistance materials and the thermal transient stresses which appear during quenching of brittle materials. The equivalency of thermally and mechanically induced stresses is assumed such as to describe the relative increase in length of the radial crack during quenching. This approach is checked in using two different glass ceramics, various quenching conditions and sample sizes. Finally is the increase in length of Vickers indentation cracks measured or samples loaded in bending and a maximum of the thermal transient stress evaluated. This offers the mean to approach an effective heat transfer coefficient. I Introduction The brittle

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