F. Menalo, G. Mohamed, M. I. Mohamed, A. A. Abuelezz, M. Adly, A. A. Khatab
This paper describes a primary Vickers hardness standard, which was developed by National Institute of for Standards (NIS), of Egypt. It is utilized synthetically the optics, precise mechanism, electronics, computer and automatic controlled technology. The CCD image system is employed, which makes the standard measuring of Vickers hardness value automatically and manually, so the indentation can be realized and accuracy can be improved .The machine has been evaluated through comparisons with the Physikalisch-Technische Bundesanstalt (PTB) Germany.
Dieter Schwenk
For the calibration of hardness reference blocks according to the German standard DIN 50156 -hardness test according Leeb -MPA NRW has realized a new concept of hardness reference standard machine. A laser interferometer is used for the continuous measurement of distance and time. In a post process the speed of the indenter will be evaluated from the measurement data. The conception of the machine, measurement capabilities and the effects of variation of test parameters are reported in the following paper.
Dieter Schwenk
The uncertainty of measurement is always characteristic of the test set-up and the test procedure. Only at the end of the calibration the uncertainty of measurement is transferred to the measured object concerning the exactness of the scale design. The problems with the inclusion of the uncertainty of measurement in the conformity according to ISO 17025 at the calibration of material test machines is often founded in the too little number of single measurements, as e.g. at the calibration of the test force on hardness test machines according to ISO 6508. The number of single measurements in...
Tassanai Sanponpute, Veera Tulasombut, Rugkanawan Kongkavitool, Apichaya Meesaplak
Hardness laboratory of National Institute of Metrology Thailand (NIMT) was a pilot laboratory and responsible for coordinating the interlaboratory comparison in Thailand. The two comparison protocols, comparison on Rockwell scale B hardness measurement and comparison in scale C hardness measurement, were set up for participant to choose according to their application. The artifacts used in these comparisons were hardness reference blocks and machinery part such as cylindrical axles and metal sheets. The measurement result and uncertainty budget were reported to pilot laboratory and are used...
Montree Pakkratoke, Natchapon Luekiatphaisan, Hisayuki Aoyama, Tassanai Saneponpute
This paper presents the development of compact size force generator mechanism with voice coil actuator and piezo driven micro robot for surface hardness and stiffness investigation. This small force generator is composed of voice coil actuator and tandem leaf spring mechanism. The small force can be controlled by electrical current which is supplied to coil and positioned precisely at the balance point with the parallel leaf spring with no mechanical friction. And the full bridge strain gauges on both side of double leaf spring can detect small force which is applied to the micro indenter....
Edward Aslanyan, Peter Krasowski, Aleksandr Doynikov, Victor Pivovarov
The present paper discusses the results of the research conducted during the improvement of the national hardness primary standard machine on Vickers scales. The improvement consisted in the creation of an automated complex for measuring the indentation diagonal length through the indentation transfer via a digital camera to the computer controlling the measurement process. The peculiarities scales of order were taken into account while examining the hardness primary standard machine and determining the metrological characteristics. The modernization of the national primary standard machine...
A. Abu-Sinna, Yon-Kyu Park, Dae-Im Kang, Min-Seok Kim
In this paper, we are willing to know the influence of the loading frame stiffness through finite element method. FEM modelling has to be run with different force application criteria, and different dimensions of loading frames. In addition, different dimensions of loading frame have been dedicated to run the experiments. The upper plate dimensions showed the superiority over all other loading frame components, and consequently the priority of the rigid loading frame. Hence, supplementary measurements as well as FEM modelling were performed to identify the exact influence and generalize the...
TC3 Conference 2010
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· 2010
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Zhong Ruilin, Wang Jian, Yao Hong, Ding jin’an, Cai Changqin, Zhang Yue
Magnetism is very important for high accuracy class weights. There are several ways to measure magnetism of weights according to OIML R111. In NIM, a new magnetism measure device has been set up to measure magnetism of weights by using gaussmeter. This device compose of a rotation platform, stick pole, control panel , computer and gaussmeter. The gaussmeter is installed on the stick pole. The platform can move horizontally and let the center of the weight just below the probe of the gaussmeter. Also the platform can rotate around and the gaussmeter can detect the largest indication, and the...
TC3 Conference 2010
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Octavian Postolache,, Pedro Silva Girão
The paper presents the hardware and software for the calibration of a pressure mapping system and the application of the sensor in ballistocardiography recording for humans vital signs unobtrusive monitoring.
TC3 Conference 2010
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· 2010
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Ebtisam H. Hasan, Günther Haucke, Rolf Kumme
The creep and creep recovery are important characteristics of force transducers. Thus, this study is focused on the measurements of creep and creep recovery for transducers of different capacities. Creep measurements are carried out according to three different loading schemes, revealed that the creep values measured at maximum loads and reached after time intervals from 30 to 300 seconds like proposed in a new draft of ISO 376 from the moment of load application. The effect was higher in direct loading (one step to reach the maximum load) than those obtained from the two other schemes...
TC3 Conference 2010
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· 2010
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