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Provision of hardness standards - final report.

Stanbury, G; Davis, F (2000) Provision of hardness standards - final report. NPL Report. CMAM 53

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As part of a EUROMET agreement, the source of UK hardness standards were transferred to IMGC in Italy in 1988. Following pressure from UK industry, it was decided that a national centre of excellence in hardness measurement and calibration should be re-established in the UK.
This report describes the basis of hardness measurement and process of re-establishing national hardness standards at NPL. Two servo-controlled hardness machines have been designed and built by hlstron Ltd and commissioned at NPL. Equipment was purchased, and modified where necessary, to measure the hardness indentations and hardness indenters. Problems encountered during commissioning are described together with additional work carried out to try to bring the equipment within the target specification. The main factors contributing to the uncertainty in measurements made with the UK hardness standard machines are considered and ongoing research aimed at reducing these uncertainties is summarised.
The launch of a UK calibration service is described and contact addresses are provided.

Item Type: Report/Guide (NPL Report)
NPL Report No.: CMAM 53
Subjects: Engineering Measurements
Engineering Measurements > Mass, Force, Pressure
Last Modified: 02 Feb 2018 13:17
URI: http://eprintspublications.npl.co.uk/id/eprint/1551

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