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Publications (5 of 5) Show all publications
Vedantha Krishna, A., Flys, O., Reddy, V. V. & Rosén, B.-G. (2017). Surface topography characterization using 3D stereoscopic reconstruction of SEM images. In: Mets&Props 2017: Mets&Props 2017: 16th International Conference on Metrology and Properties of Engineering Surfaces: Conference abstracts, 2017. Paper presented at 16th International Conference on Metrology and Properties of Engineering Surfaces, Gothenburg, Sweden, June 27-29, 2017 (pp. 219-221).
Open this publication in new window or tab >>Surface topography characterization using 3D stereoscopic reconstruction of SEM images
2017 (English)In: Mets&Props 2017: Mets&Props 2017: 16th International Conference on Metrology and Properties of Engineering Surfaces: Conference abstracts, 2017, 2017, p. 219-221Conference paper, Oral presentation with published abstract (Refereed)
Keywords
Scanning Electron Microscope, Coherence Scanning Interferometer, Stereoscopic Reconstruction, Power Spectral Density, Areal Surface Texture Parameters
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Identifiers
urn:nbn:se:hh:diva-35173 (URN)
Conference
16th International Conference on Metrology and Properties of Engineering Surfaces, Gothenburg, Sweden, June 27-29, 2017
Available from: 2017-10-10 Created: 2017-10-10 Last updated: 2018-03-23Bibliographically approved
Reddy, V. V., Flys, O., Vedantha Krishna, A. & Rosén, B. G. (2017). Topography characterization of fused deposition modeling surfaces. In: : . Paper presented at European society for precision engineering and nanotechnology- Special Interest Group: additive manufacturing.
Open this publication in new window or tab >>Topography characterization of fused deposition modeling surfaces
2017 (English)Conference paper, Oral presentation with published abstract (Refereed)
Keywords
Additive manufacturing (AM), Fused Deposition Modelling (FDM), Surface Topography, Areal surface parameters, Power Spectral Density (PSD)
National Category
Materials Engineering
Identifiers
urn:nbn:se:hh:diva-35176 (URN)
Conference
European society for precision engineering and nanotechnology- Special Interest Group: additive manufacturing
Available from: 2017-10-10 Created: 2017-10-10 Last updated: 2018-03-23
Flys, O., Källberg, S., Ged, G., Silvestri, Z. & Rosén, B.-G. (2015). Characterization of surface topography of a newly developed metrological gloss scale. Surface Topography: Metrology and Properties, 3(4), Article ID 045001.
Open this publication in new window or tab >>Characterization of surface topography of a newly developed metrological gloss scale
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2015 (English)In: Surface Topography: Metrology and Properties, ISSN 2051-672X, Vol. 3, no 4, article id 045001Article in journal (Refereed) Published
Abstract [en]

In the European Joint Research Project 'Multidimensional Reflectometry for Industry', a new gloss scale was developed with the aim to represent different levels of gloss, hue, roughness, and refractive indices. In this paper, the surfaces of six selected samples were thoroughly investigated using various measuring techniques in order to verify the outcome of the novel manufacturing processes in terms of distinct levels as well as types of surface roughness. The aim of the evaluation was to capture surface structures in different wavelength intervals utilizing a confocal microscope, a coherence scanning interferometer, and an atomic force microscope. Power spectral density functions were also calculated from the measurements and used to determine suitability of techniques for different roughness scales. The measurements show that the expected surface characteristics as well as different RMS roughness values are intimately connected to the perceived glossiness.

Place, publisher, year, edition, pages
Bristol: Institute of Physics (IOP), 2015
Keywords
surface topography, gloss, PSD
National Category
Engineering and Technology Electrical Engineering, Electronic Engineering, Information Engineering Production Engineering, Human Work Science and Ergonomics Nano Technology
Identifiers
urn:nbn:se:hh:diva-30116 (URN)10.1088/2051-672X/3/4/045001 (DOI)000364386300009 ()2-s2.0-84979198389 (Scopus ID)
Funder
EU, European Research Council
Note

This work was partially funded by the European Metrological Research Program (EMRP). The EMRP is jointly funded by the EMRP-participating countries with EURAMET and the European Union.

Available from: 2015-12-29 Created: 2015-12-29 Last updated: 2016-11-24Bibliographically approved
Glon, F., Flys, O., Lööf, P.-J. & Rosén, B.-G. (2014). 3D SEM for surface topography quantification – a case study on dental surfaces. Paper presented at 14th International Conference on Metrology and Properties of Engineering Surfaces (Met and Props 2013), Taipei, Taiwan, 17-21 June, 2013. Journal of Physics, Conference Series, 483(1), Article ID 012026.
Open this publication in new window or tab >>3D SEM for surface topography quantification – a case study on dental surfaces
2014 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 483, no 1, article id 012026Article in journal (Refereed) Published
Abstract [en]

3D analysis of surface topography is becoming a more used tool for industry and research. New ISO standards are being launched to assist in quantifying engineering surfaces. The traditional optical measuring instrumentation used for 3D surface characterization has been optical interferometers and confocal based instrumentation. However, the resolution here is limited in the lateral dimension to the wavelength of visible light to about 500 nm. The great advantage using the SEM for topography measurements is the high flexibility to zoom from low magnifications and locating interesting areas to high magnification of down to nanometer large surface features within seconds. This paper presents surface characterization of dental implant micro topography. 3D topography data was created from SEM images using commercial photogrammetric software. A coherence scanning interferometer was used for reference measurements to compare with the 3D SEM measurements on relocated areas. As a result of this study, measurements emphasizes that the correlation between the accepted CSI measurements and the new technology represented by photogrammetry based on SEM images for many areal characterization parameters are around or less than 20%. The importance of selecting sampling and parameter sensitivity to varying sampling is high-lighted. Future work includes a broader study of limitations of the photogrammetry technique on certified micro-geometries and more application surfaces at different scales. © Published under licence by IOP Publishing Ltd.

Place, publisher, year, edition, pages
Bristol: Institute of Physics Publishing (IOPP), 2014
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:hh:diva-25164 (URN)10.1088/1742-6596/483/1/012026 (DOI)000336670300026 ()2-s2.0-84898937910 (Scopus ID)
Conference
14th International Conference on Metrology and Properties of Engineering Surfaces (Met and Props 2013), Taipei, Taiwan, 17-21 June, 2013
Available from: 2014-04-27 Created: 2014-04-27 Last updated: 2018-03-22Bibliographically approved
Flys, O., Dimkovski, Z., Olsson, B., Rosén, B.-G. & Bååth, L. (2014). Piston ring topography variation and robust characterization. In: : . Paper presented at SPS'14, The 6th Swedish Production Symposium, Gothenburg, Sweden, September 16-18, 2014.
Open this publication in new window or tab >>Piston ring topography variation and robust characterization
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2014 (English)Conference paper, Published paper (Refereed)
Abstract [en]

It is a constant challenge for the automotive industry to reduce friction losses and oil consumption in automobile engine. The piston ring friction accounts for approximately 20% of the total mechanical energy losses in a modern engine. Oil control rings limit and control the oil consumption of the engine as well. They scrape off excess lubricating oil from the cylinder walls and return it to the crank case. Piston rings are designed to distribute the thin oil film evenly to ensure piston and ring lubrication. The surface topography of a piston ring is an efficient variable in the control of the oil consumption and friction losses. In places where the interacting surfaces come in contact, the oil film thickness is extremely thin and the surface asperities may deform because of the high pressures. There are different types of oil control rings.The most common one is the twin land oil control ring, which consists of two narrow lands that scrape off the oil on the liner and a spring on the back that exerts the load. In this paper, the surfaces of the two lands were investigated, since they play the key role in its function. The goal is to map the variation in surface roughness of piston rings that appear at different scales from form and waviness to micro and nano roughness. Areal topography measurements were made by white light interferometer designed at the Halmstad University able to measure and scan the total functional area of a piston ring. An significant amount of oil control piston rings of heavy duty truck engines were examined and 24 measurements were made in circumferential direction and on each ring land. The results show both the variation and uncertainty of the ring topography and discuss the instrument and measuring methodology uncertainty. The most stable parameters were found and recommended for an effective quality control. Comparisons between established coherence scanning interferometer and the instrument built in Halmstad were made. To ensure a good quality, the measurements were made both on calibration standards and on piston ring surfaces. Finally the influence on function and energy losses in the final engine assembly is discussed to indicate future design and metrology improvements.  

Keywords
piston ring, white light interferometer, surface topography, measurement uncertainty
National Category
Engineering and Technology
Identifiers
urn:nbn:se:hh:diva-27496 (URN)
Conference
SPS'14, The 6th Swedish Production Symposium, Gothenburg, Sweden, September 16-18, 2014
Available from: 2015-01-16 Created: 2015-01-16 Last updated: 2015-08-21Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-7501-8318

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