Byrne, W P; Morrell, R (2000) Results of the UK interlaboratory strength test exercide. NPL Report. CMMT(A)296

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Abstract

The UK interlaboratory strength test exercise on ceramic materials is described, and the results from the participating laboratories are discussed. Large differences in uniaxial flexural test results between laboratories can be ascribed to differences in test jig geometry and mode of operation, in particular to an inability to align the specimen, to distribute the applied load evenly and to minimise friction effects. Determination of the static fatigue parameter "n" by undertaking tests at a variety of loading rates gave a wide spread of results. A simple three-bell support disc was also evaluated, and gave fairly reproducible results although analysis of the data proved to be complicated by the existence of a bimodal distribution of strengths of the alumina ceramic used, Some guidelines for improved practice are established.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	CMMT(A)296
Subjects:	Advanced Materials
Last Modified:	02 Feb 2018 13:17
URI:	http://eprintspublications.npl.co.uk/id/eprint/1795

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