ESTIMATION OF UNCERTAINTY IN HARDNESS MEASUREMENT OF RUBBER AND OTHER ELASTOPLASTIC MATERIALS |
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| A. Stibler, K. Herrmann |
- Abstract:
- In this paper the approach and results for the estimation of uncertainty in measurements of rubber and plastics are presented. The developed uncertainty guidelines are based on "Guide to the Expression of Uncertainty in Measurement" (ISO GUM). As the most important and widely used hardness measuring methods for rubber and plastics the methods according to Durometer (A and D) and to the International Rubber Hardness Degree (IRHD), scales N, M and L are dealt with. Additionally a new hardness measuring method for soft silicones, called Hardness Very Low (HVL), which is still in the process of standardization, is considered. According to the calibration methods direct calibration of test force, indentation depth and geometrical deviations of indenters must be carried out. Correspondingly the uncertainty of these direct calibrations have to be determined. In order to indicate the uncertainty based on these direct calibration expressed in hardness units, it is necessary to summarize the uncertainties of the direct calibration with the aid of sensitivity coefficients. Further, indirect calibrations with reference test blocks also require to indicate the uncertainty in hardness units.
- Keywords:
- uncertainty of measurement, hardness of rubber and plastics
- Download:
- PWC-2006-TC5-013u.pdf
- DOI:
- -
- Event details
- Event name:
- XVIII IMEKO World Congress
- Title:
Metrology for a Sustainable Development
- Place:
- Rio de Janeiro, BRAZIL
- Time:
- 17 September 2006 - 22 September 2006