EVALUATION OF DESTRUCTIVE TESTS ON DRAWN WIRES

1 JAROŠOVÁ Eva
Co-authors:
2 KLAPUT Pavel 3 FABÍK Richard
Institutions:
1 ŠKODA AUTO University, Mladá Boleslav, Czech Republic, EU, jarosova@is.savs.cz
2 VSB - Technical University of Ostrava, Ostrava, Czech Republic, EU, pavel.klaput@vsb.cz
3 VSB - Technical University of Ostrava, Ostrava, Czech Republic, EU, richard.fabik@vsb.cz
Conference:
26th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 24th - 26th 2017
Proceedings:
Proceedings 26th International Conference on Metallurgy and Materials
Pages:
2010-2015
ISBN:
978-80-87294-79-6
ISSN:
2694-9296
Published:
9th January 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
29 views / 5 downloads
Abstract

The paper deals with the evaluation of experimental data on samples of steel wire. The main attention is aimed at the R&R study, which was a part of the experiment for studying effects of three factors on various mechanical properties of drawn wires. The experiment was performed in the wire drawing laboratory at VŠB-Technical University of Ostrava. Samples of wire were tested for tensile, torsion and bending fatigue. Several operators took part in the experiment. Due to the destructive character of tests, a nested design was considered. The R&R study revealed that the mechanical properties along the wire length were not uniform and that the key assumption of the destructive-test analysis was not met. Since the employed scheme of assigning drawn wires to operators led to confounding of effects and made the further analysis dubious, another arrangement for this type of experiment is suggested in the paper. Apart from the R&R analysis, statistical methods of evaluation that take the real experimental pattern into account are discussed. The method based on means is applied and significant effects are identified.

Keywords: destructive tests, nested design, R&R study, ANOVA
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