THE LASER TEXTURED SURFACES OF THE SILICON CARBIDE ANALYZED WITH THE BOOTSTRAPPED TRIBOLOGY MODEL

1 DWORNICKA Renata
Co-authors:
2 RADEK Norbert 1 KRAWCZYK Mariusz 1 OSOCHA Przemysław 1 POBĘDZA Janusz
Institutions:
1 Cracow University of Technology, Faculty of Mechanical Engineering, Kraków, Poland, EU, dwornick@mech.pk.edu.pl, scorpio@mech.pk.edu.pl, osocha@mech.pk.edu.pl, janusz.pobedza@mech.pk.edu.pl
2 Technical University of Kielce, Centre for Laser Technologies of Metals, Kielce, Poland, EU, norrad@tu.kielce.pl
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:
1252-1257
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:
21 views / 3 downloads
Abstract

The surface layer properties of super-hard materials may be modified by a laser beam treatment and the regular texturization is one of possible approaches. The designed experiment was conducted based on two main controlled factors: the average diameter of cavities and the level of the blackening. The obtained dataset was processed with a response surface model for the coefficient of friction as the outcome. Typical statistical analysis of data with quantitative control factors bases on many theoretical assumptions, with the most important and the most influential one: the normality of random noises distributions. Such assumption is often used but rarely it is analyzed for its weakness and large uncertainty in results. The paper describes a non-parametric approach to the statistical analysis of the uncertainty. It releases us from the direct assumption of particular probability distributions. The bootstrap is formally the method based on random resampling with replacement from the source dataset. It allows to identify the whole distribution shape of raw data and related confidence intervals without additional assumptions about particular distribution. The paper presents the analysis processed for the practical case: original, commercially available rings for front sealing sintered from SiC with a texture modified by a laser beam and tested on tribological tester for changed properties. The paper contains notes on encountered difficulties and possible guidelines for similar analysis.

Keywords: Bootstrap, uncertainty, non-parametric approach, tribology, laser beam texturization
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