H. Baumann, A. Eichenberger, B. Jeckelmann, Ch. Beguin, R. Clavel, F. Cosandier, D. Reber, D. Tommasini
The kilogram is the last unit of the international system (SI) still based on a material artifact, the international prototype of the kilogram (IPK). The comparisons made in the last hundred years have clearly revealed a long term relative drift between the IPK and a set of copies kept under similar conditions. Since the long term stability is one of the major conditions set on the SI base units, this situation is no longer satisfactory and a new definition of the mass unit becomes a priority for the metrology community. A promising route towards a new definition based on fundamental...
XX IMEKO World Congress
· TC7
· 2012
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Eric Benoit
The colour, with the particularity to be defined simultaneously as a physical quantity and as a psychophysical quantity, is one of the concepts that can link hard sciences and behavioural sciences. From the viewpoint of behavioural sciences colours are basically measured with nominal scales, and in hard science colours are measured with interval scales. Our hypothesis is that the main relation that must be preserved during colour measurement is a metric. We suggest then that colours must be measured with metrical scales. The fuzzy metrical scale is preferred due to the possibility to define...
XX IMEKO World Congress
· TC7
· 2012
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A. Chunovkina, K. Sapozhnikova, R. Taymanov
Some proposals with regard to the future version of the VIM are given. The proposals concern definitions of the terms "measurement", "nominal property", "metrological traceability", "sensor", "measuring system", etc. A necessity to apply measurements to new fields and take into account new technologies is grounded.
XX IMEKO World Congress
· TC7
· 2012
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T. Aleksandrov Fabijanic, Ž. Alar, M. Franz
Development of reference hardness blocks for the high hardness range by the powder metallurgy process will be presented in this paper. Development would start with the selection of powder, matrix and grain growth inhibitors as well as parameters related to the technological process of obtaining which are related to milling, compacting and sintering. Mentioned would be realized in order to ensure the measurement traceability of the Vickers hardness for the Republic of Croatia for the high hardness range and to contribute to the spectrum of materials and processes of manufacturing reference...
XX IMEKO World Congress
· TC5
· 2012
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Nae- Hyung Tak, Seong-Gu Hong, Gun Woong Bahng, Sang-Bo Bae
Although ball indenter plays a key role in the measurement of Rockwell hardness, its verification procedure, which is essentially required to provide reliable data, has not been adequately detailed in ISO 6508; only the requirements for ball size are described. When considering the ball indenter is composed of two main parts, the ball and the ball holder, these insufficient requirements for the ball indenter can give rise to unorganized measured data and consequently result in an increase of uncertainty. In fact, many problems regarding the reliability of measured data are widely being...
XX IMEKO World Congress
· TC5
· 2012
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USING TRACED MOCRO-CMM IN CMS
I-Chih Ni, Sheau-shi Pan, Jian-Lin Huang, Sheng-Jui Chen The Primary Rockwell Hardness Standard System was set up in the Center for Measurement Standards since July 1996 till June 1997. During the time, a laser interferometer, HP10737R 3-axis compact interferometer system was used to measure the effect of pitch and yaw of the Rockwell Hardness machine. While the geometry of the diamond was not determined. In order to increase the performance of hardness measurement .In this paper, we will present the results of indenter geometry by µ-CMM in CMS.
XX IMEKO World Congress
· TC5
· 2012
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C. Kuzu, E. Pelit
One of the best ways for assuring the quality of the calibration results for accredited/non-accredited laboratories is to participate in interlaboratory comparisons. For this reason TURKAK (Turkish Accreditation Agency) and TÜBÝTAK UME (National Metrology Institute of Turkey) for first time had decided to organize an interlaboratory comparison which was piloted by UME Hardness Laboratory in the field of verification/calibration of hardness testing machines (HTM). Besides UME, 9 accredited laboratories participated in the comparison and E n numbers for all ranges between pilot and each...
XX IMEKO World Congress
· TC5
· 2012
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Edward Aslanyan, Viktor Pivovarov, Andrey Aslanyan, Vasily Shlegel
The current paper describes the results of measurements conducted during the improvement of the national primary hardness standard machine on Vickers scales. As a result of improvement, the range of applied loads has been expanded from 0,098 N to 0,0098 N. This helped to provide the uniformity of hardness measurements on Vickers scales HV0,005, HV0,002 and HV0,001, expand the standard machine application area as well as reduce measurements uncertainty on the primary standard machine as a result of studying geometrical parameters of reference indenters with the help of a new high-precision...
XX IMEKO World Congress
· TC5
· 2012
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Feng Zhang, Li He
This paper mainly presents that one standard Rockwell hardness machine has been developed based on force loading using motor in closed-loop method without weight. The mechanical structure of the machine, design principle of the closed-loop force and the control method, are introduced. The results show that the precision of the preliminary and total force can respectively achieve to 0.2% and 0.1%, and the expand uncertainty is not more than 0.3 HRC, k = 2.
XX IMEKO World Congress
· TC5
· 2012
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M. Yamamoto, T.Yamamoto ,K. Miyahara, S. Maki, M.Nakamura
Conventional rebound hardness tests like Shore and Leeb hardness tests are mainly applied for massive and large specimens like mill roll. For small or thin specimens, however, “mass effect,” i.e., loss of impact energy due to vibration of specimens during impact cannot be ignored. Nakamura and Maki proposed a simple rebound hardness test using a small ball indenter that is expected to reduce the mass effect. In this paper, we developed a prototype of a free-fall-type rebound hardness tester and carried out experiments to provide fundamental information necessary to establish Nakamura-Maki...
XX IMEKO World Congress
· TC5
· 2012
· Download