HE INFLUENCE OF THE BALL MATERIAL ON THE BRINELL HARDNESS
Journal Title: Metrology and Measurement Systems - Year 2008, Vol 15, Issue 3
Abstract
A Brinell hardness tester with carbide and steel balls was calibrated and thereafter the hardness of ten samples of steel STN 41 1600 was measured by four appraisers. The uncertainty of calibration and of the hardness measurement were calculated. The results obtained with carbide and steel balls were confronted using uncertainty analysis, measurement systems analysis (MSA), analysis of variance (ANOVA), unpaired t-test and Z-score. The calibrated hardness tester is not considered satisfactory because the values of relative expanded uncertainty of calibration (relative maximum permissible error) and maximum error exceed the values permitted by the standard for both balls. The statistically significant difference between the uncertainties and relative maximum error obtained by carbide and steel balls was not confirmed neither at calibration nor at measurement of steel sample hardness. Measurement system analysis confirmed some influence of used ball materials on the results of individual appraisers on the capability of the hardness measurement process (indices %AV, %GRR and ndc) in accordance with the results of the unpaired t-test.
Authors and Affiliations
JOZEF PETRÍK, TOMÁŠ TOMPOŠ, VOJTECH ŠPEŤUCH
Keywords
Related Articles
- EP ID EP113118
- DOI -
- Views 66
- Downloads 0
DYNAMIC MEASUREMENT OF THE CURVE y(x) DEFINED BY PARAMETRIC RELATIONS x(t), y(t) UNDER RANDOM DISTURBANCES
Analog XY-recorders constructed as servomechanisms with sliding motion have been practically out of use for some time. Drawing the curve y(x) defined by parametric relations xz(t), yz(t) under additive, random disturbanc...
COMPARISON OF LS-TYPE METHODS FOR DETERMINATION OF OLIVE OIL MIXTURES ON THE BASIS OF NIR SPECTRAL DATA
The spectrophotometric analysis of oil mixtures, containing olive oil, is the subject of this paper. Its objective is to compare six least-squares-type estimators which are potentially applicable for determination of a...
A STUDY ON THE FEASIBILITY AND EFFECTIVENESS OF DIGITAL FILTER APPLICATION FOR HARMONIC AND INTERHARMONIC MEASUREMENT IN COMPLIANCE WITH IEC 61000-4-7<br />
Large scale monitoring of power quality in electrical power plants is nowadays a pressing need due to the liberalization of the electrical market in many countries and the deeper interconnections of electrical networks....
PROF. DR HAB. INŻ. STANISŁAW ADAMCZAK HONORIS CAUSA DOCTORATE, UNIVERSITY OF ZILINA (SLOVAKIA)
On 16 November 2007, Prof. dr hab. inż. Stanisław Adamczak, Dean of the Faculty of Mechatronics and Machine Building at the Kielce University of Technology, member of the Committee on Metrology and Research Equipment and...
DATA FUSION APPLICATIONS IN THE TRAFFIC PARAMETERS MEASUREMENT
In the paper the problem of measuring road traffic parameters using systems with complex algorithms for measurement data processing is discussed. A characteristic feature of these systems is utilising there data fusion m...