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Publications (8 of 8) Show all publications
Flys, O., Jarlemark, P., Petronis, S., Patrik, S. & Rosén, B. G. (2018). Applicability of characterization techniques on fine scale surfaces. Surface Topography: Metrology and Properties, 6(3), Article ID 034015.
Open this publication in new window or tab >>Applicability of characterization techniques on fine scale surfaces
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2018 (English)In: Surface Topography: Metrology and Properties, ISSN 2051-672X, Vol. 6, no 3, article id 034015Article in journal (Refereed) Published
Abstract [en]

In this study, several surface topographies typical for dental implants were evaluated by different measurement techniques. The samples were prepared by machine turning, wet chemical etching and electrochemical polishing of titanium discs. The measurement techniques included an atomic force microscope (AFM), coherence scanning interferometer (CSI) and a 3D stereo scanning electron microscope (SEM). The aim was to demonstrate and discuss similarities and differences in the results provided by these techniques when analyzing submicron surface topographies. The estimated surface roughness parameters were not directly comparable since the techniques had different surface spatial wavelength band limits. However, the comparison was made possible by applying a 2D power spectral density (PSD) function. Furthermore, to simplify the comparison, all measurements were characterized using the ISO 25178 standard parameters. Additionally, a Fourier transform was applied to calculate the instrument transfer function in order to investigate the behavior of CSI at different wavelength ranges. The study showed that 3D stereo SEM results agreed well with AFM measurements for the studied surfaces. Analyzed surface parameter values were in general higher when measured by CSI in comparison to both AFM and 3D stereo SEM results. In addition, the PSD analysis showed a higher power spectrum density in the lower frequency range 10−2–10−1 µm−1 for the CSI compared with the other techniques. © 2018 IOP Publishing Ltd

Place, publisher, year, edition, pages
Bristol: Institute of Physics Publishing (IOPP), 2018
Keywords
surface roughness, PSD, AFM, CSI
National Category
Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:hh:diva-37956 (URN)10.1088/2051-672X/aacf5e (DOI)000440081900002 ()
Available from: 2018-09-12 Created: 2018-09-12 Last updated: 2019-04-26Bibliographically approved
Vedantha Krishna, A., Flys, O., Reddy, V. V., Leicht, A., Hammar, L. & Rosén, B. G. (2018). Potential approach towards effective topography characterization of 316L stainless steel components produced by selective laser melting process. In: European Society for Precision Engineering and Nanotechnology, Conference Proceedings - 18th International Conference and Exhibition, EUSPEN 2018: . Paper presented at Euspen’s 18th International Conference & Exhibition, Venice, Italy, 4th-8th June, 2018 (pp. 259-260). Bedford: euspen
Open this publication in new window or tab >>Potential approach towards effective topography characterization of 316L stainless steel components produced by selective laser melting process
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2018 (English)In: European Society for Precision Engineering and Nanotechnology, Conference Proceedings - 18th International Conference and Exhibition, EUSPEN 2018, Bedford: euspen , 2018, p. 259-260Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

In this paper, an attempt is made to explain the surface texture of Selective Laser Melting (SLM) parts more satisfyingly than the existing methods. Investigations were carried out on the 316L stainless steel SLM samples. To account for most of the surface conditions, a truncheon artefact was employed for the analysis. A Stylus Profilometer was employed as a metrology tool for obtaining the 3D surface measurements. A methodology is proposed to extract and characterize the topographic features of Additive Manufactured (AM) surfaces. Here, the overall roughness of the surface is segregated into the roughness of the powder particles and the waviness due to thermal and the “staircase” effects. Analyzing these features individually results in an increased understanding of the AM process and an opportunity to optimize machine settings.

Place, publisher, year, edition, pages
Bedford: euspen, 2018
Keywords
Surface Metrology, Selective Laser Melting, Profilometer, Areal Surface Parameters, Feature-based characterization
National Category
Materials Engineering
Identifiers
urn:nbn:se:hh:diva-38126 (URN)2-s2.0-85054549685 (Scopus ID)9780995775121 (ISBN)0995775125 (ISBN)
Conference
Euspen’s 18th International Conference & Exhibition, Venice, Italy, 4th-8th June, 2018
Available from: 2018-10-09 Created: 2018-10-09 Last updated: 2019-01-08Bibliographically approved
Reddy, V. V., Flys, O., Chaparala, A., Berrimi, C. E., Vedantha Krishna, A. & Rosén, B. G. (2018). Study on surface texture of Fused Deposition Modeling. In: Mauro Onori, Lihui Wang, Xi Vincent Wang, Wei Ji (Ed.), Proceedings of the 8th Swedish Production Symposium (SPS 2018): . Paper presented at 8th Swedish Production Symposium, SPS 2018, Stockholm, Sweden, 16-18 May, 2018 (pp. 389-396). Amsterdam: Elsevier, 25
Open this publication in new window or tab >>Study on surface texture of Fused Deposition Modeling
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2018 (English)In: Proceedings of the 8th Swedish Production Symposium (SPS 2018) / [ed] Mauro Onori, Lihui Wang, Xi Vincent Wang, Wei Ji, Amsterdam: Elsevier, 2018, Vol. 25, p. 8p. 389-396Conference paper, Published paper (Refereed)
Abstract [en]

Fused Deposition Modeling (FDM) is mostly used to develop functional prototypes and in some applications for end-use parts. It is important to study the surfaces produced by FDM to understand the certainty of process. Truncheon design test artefacts are printed at different print settings and surfaces are measured using stylus profilometer. Taguchi’s design of experiments, signal-to-noise ratio and multiple regression statistics are implemented to establish a concise study of the individual and combined effect of process variables on surface texture parameters. Further, a model is developed to predict the roughness parameters and is compared with experimental values. The results suggest significant roughness parameter values decrease with increase in build inclination and increases with increase in layer thickness except the roughness peak count. © 2018 The Authors. Published by Elsevier B.V

Place, publisher, year, edition, pages
Amsterdam: Elsevier, 2018. p. 8
Series
Procedia Manufacturing, E-ISSN 2351-9789 ; 25
Keywords
Additive manufacturing, Fused Deposition Modeling, Surface texture parameters, Surface roughness
National Category
Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:hh:diva-38122 (URN)10.1016/j.promfg.2018.06.108 (DOI)
Conference
8th Swedish Production Symposium, SPS 2018, Stockholm, Sweden, 16-18 May, 2018
Projects
Digitalization of the supply chain of the Swedish Additive Manufacturing (DiSAM)Business Model Innovation
Funder
VINNOVAKnowledge Foundation
Note

Funding: VINNOVA, Sweden’s innovation agency and Produktion2030 under the project Digitalization of the supply chain of the Swedish Additive Manufacturing (DiSAM) and Sweden’s The Knowledge Foundation under the project Business Model Innovation when adapting to Digital Production - opportunities and problems.

Available from: 2018-10-09 Created: 2018-10-09 Last updated: 2019-01-03Bibliographically approved
Vedantha Krishna, A., Flys, O., Reddy, V. V. & Rosén, B. G. (2018). Surface topography characterization using 3D stereoscopic reconstruction of SEM images. Surface Topography: Metrology and Properties, 6(2), Article ID 024006.
Open this publication in new window or tab >>Surface topography characterization using 3D stereoscopic reconstruction of SEM images
2018 (English)In: Surface Topography: Metrology and Properties, ISSN 2051-672X, Vol. 6, no 2, article id 024006Article in journal (Refereed) Published
Abstract [en]

A major drawback of the optical microscope is its limitation to resolve finer details. Many microscopes have been developed to overcome the limitations set by the diffraction of visible light. The scanning electron microscope (SEM) is one such alternative: it uses electrons for imaging, which have much smaller wavelength than photons. As a result high magnification with superior image resolution can be achieved. However, SEM generates 2D images which provide limited data for surface measurements and analysis. Often many research areas require the knowledge of 3D structures as they contribute to a comprehensive understanding of microstructure by allowing effective measurements and qualitative visualization of the samples under study. For this reason, stereo photogrammetry technique is employed to convert SEM images into 3D measurable data. This paper aims to utilize a stereoscopic reconstruction technique as a reliable method for characterization of surface topography. Reconstructed results from SEM images are compared with coherence scanning interferometer (CSI) results obtained by measuring a roughness reference standard sample. This paper presents a method to select the most robust/consistent surface texture parameters that are insensitive to the uncertainties involved in the reconstruction technique itself. Results from the two-stereoscopic reconstruction algorithms are also documented in this paper. © 2018 IOP Publishing Ltd.

Place, publisher, year, edition, pages
Bristol: Institute of Physics (IOP), 2018
Keywords
Image resolution, Interferometers, Light, Photogrammetry, Power spectral density, Scanning, Scanning electron microscopy, Spectral density, Stereo image processing, Surface measurement, Surface topography, Three dimensional computer graphics, High magnifications, Reconstruction algorithms, Reconstruction techniques, Reference standard samples, Scanning interferometers, Stereophotogrammetry, Surface texture parameters, The scanning electron microscopes (SEM), Image reconstruction
National Category
Medical Image Processing Computer Vision and Robotics (Autonomous Systems)
Identifiers
urn:nbn:se:hh:diva-38710 (URN)10.1088/2051-672X/aabde1 (DOI)000432445700001 ()2-s2.0-85051421851 (Scopus ID)
Available from: 2019-01-08 Created: 2019-01-08 Last updated: 2019-01-08Bibliographically approved
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
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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