Дисертації з теми "Surface topography-roughness"
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Sharma, Priyanka. "Investigations of Titan's Topography and Surface Roughness." Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/241978.
Повний текст джерелаMitik-Dineva, Natasa. "Bacterial attachment to micro- and nano- structured surfaces." Swinburne Research Bank, 2009. http://hdl.handle.net/1959.3/48547.
Повний текст джерелаLoboda, V. B., Yu O. Shkurdoda, A. I. Saltykova, and V. M. Kolomiets. "The Temperatures’ Influence of Substrate and Annealing on a Surface Relief and Diffusion in Multilayer Film Systems." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35308.
Повний текст джерелаWerner, Oskar. "Computer Modelling of the Influence of Surface Topography on Water Repellency and a Study on Hydrophobic Paper Surfaces with Partly Controlled Roughness." Thesis, Linköping University, The Department of Physics, Chemistry and Biology, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2614.
Повний текст джерелаA computer model based on minimization of the free energy, capable to predict contact angles and spreading transitions between Wenzel and Cassie mode for drops placed on surfaces with different topography were implemented in matlab. Simulations were compared with experiments documented in the literature. These showed that reported transitions between Cassie and Wenzel mode can be explained by minimization of the free energy. In this report, a study on the possibility of constructing water repellent paper surfaces with a combination of treatment with octadecyltrichlorosilane and topography changes, is included.
Pavlík, František. "Studium vlivu parametru elipticity na rozložení tloušťky mazacího filmu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229941.
Повний текст джерелаPalodhi, Kanik. "Absolute surface topography measurement with polarisation sensitive coherence scanning interferometry." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/14411.
Повний текст джерелаHu, Chen. "Surface Optimization of the Silicon Templates for Monolithic Photonics Integration." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-37226.
Повний текст джерелаLindberg, Eskil. "Vehicle Disc Brake Roughness Noise : Experimental Study of the Interior Noise andVibro-Acoustic Modelling of Suspension Systems." Licentiate thesis, KTH, MWL Strukturakustik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-39554.
Повний текст джерелаQC 20110913
McGinnis, Nathaniel L. "Topography and Land-Cover Effects on Tornado Intensity using Rapid-Scan Mobile Radar Observations and Geographic Information Systems." Ohio University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1471459517.
Повний текст джерелаHroděj, Daniel. "Pokročilé metody vyhodnocování topografie povrchu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417589.
Повний текст джерелаWilson, Cameron. "Mediation of Osteoblast Responses to Titanium Roughness by Adsorbed Proteins." Queensland University of Technology, 2005. http://eprints.qut.edu.au/16096/.
Повний текст джерелаWilson, Cameron John. "Mediation of Osteoblast Responses to Titanium Roughness by Adsorbed Proteins." Thesis, Queensland University of Technology, 2005. https://eprints.qut.edu.au/16096/1/Cameron_Wilson_Thesis.pdf.
Повний текст джерелаAhmad, Ola. "Stochastic representation and analysis of rough surface topography by random fields and integral geometry - Application to the UHMWPE cup involved in total hip arthroplasty." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2013. http://tel.archives-ouvertes.fr/tel-00905519.
Повний текст джерелаLogins, Andris. "High speed milling technological regimes, process condition and technological equipment condition influence on surface quality parameters of difficult to cut materials." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/164122.
Повний текст джерела[CA] La qualitat superficial en les peces mecanitzades depèn de l'acabat superficial, resultat de les marques deixades per l'eina durant el procés de tall. Les aproximacions teòriques tradicionals indiquen que aquestes marques estan relacionades amb els paràmetres de tall (velocitat de tall, avanç, profunditat de tall...), el tipus de màquina, el material de la peça, la geometria de l'eina, etc. Però no tots els tipus de mecanitzat i selecció de materials poden donar un resultat ambigu. Avui en dia, de manera progressiva, s'estan utilitzant les tècniques de fresat d'Alta Velocitat sobre materials de difícil mecanització cada vegada més. El fresat d'Alta Velocitat implica un considerable nombre de paràmetres del procés que poden afectar la formació topogràfica 3D de la superfície. La hipòtesi que els paràmetres de rugositat superficial depenen de les empremtes deixades per l'eina, determinades per les condicions de treball i les propietats de l'entorn, va conduir al desenvolupament d'una metodologia d'investigació personalitzada. Aquest treball de recerca mostra com la combinació dels paràmetres, inclinació de l'eix de l'eina, deflexió geomètrica de l'eina i comportament vibracional de l'entorn, influencien sobre el paràmetre de rugositat superficial 3D, Sz. El model general va ser dividit en diverses parts, on s'ha descrit la influència de paràmetres addicionals del procés, sent inclosos en el model general proposat. El procés incremental seguit permet a l'autor desenvolupar un model matemàtic general, pas a pas, testejant i afegint els components que més afecten a la formació de la topografia de la superfície. En la primera part de la investigació es va seleccionar un procés de fresat amb eines de punta plana. Primer, s'analitza la geometria de l'eina, combinada amb múltiples avanços, per distingir els principals paràmetres que afecten la rugositat superficial. S'introdueix un model de predicció amb un component bàsic per a l'altura de la rugositat, obtinguda a través de la geometria de l'eina de tall. A continuació, es duen a terme experiments més específicament dissenyats, variant paràmetres tecnològics. Això comença amb l'anàlisi de la inclinació de l'eix de l'eina contra la taula de fresat. Els espècimens d'anàlisi són mostres amb quatre recorreguts de tall rectes amb tall en sentit contrari. Les trajectòries lineals amb diferents direccions donen l'oportunitat d'analitzar la inclinació del fus de fresat en la màquina. Una anàlisi visual revelà diferències entre direccions de tall oposades, així com marques deixades pel tall posterior de l'eina. Considerant les desviacions de les marques de tall observades en les imatges de rugositat superficial obtingudes a partir de les mesures, es va introduir una anàlisi sobre el comportament dinàmic de l'equip i de l'eina de tall. Les vibracions produeixen desviacions en la taula de fresat i en l'eina de tall. Aquestes desviacions van ser detectades i incloses en el model matemàtic per completar la precisió en la predicció de el model. Finalment, el model de predicció de el paràmetre de rugositat Sz va ser comprovat amb un major nombre de paràmetres del procés. Els valors de Sz mesurats i predits, van ser comparats i analitzats estadísticament. Els resultats van revelar una major desviació de la rugositat predita en les mostres fabricades amb diferents màquines i amb diferents avanços. Importants conclusions sobre la precisió de l'equip de fabricació han estat extretes i d'elles es desprèn que l'empremta de l'eina de tall està directament relacionada amb els paràmetres de la topografia de la superfície. A més, la influència de la empremta està afectada per la geometria de l'eina de tall, la rigidesa de l'eina i la precisió de l'equip. La geometria de l'eina conforma la base del paràmetre Sz, desviació de l'altura de la superfície. Les conclusions assolides són la base per recomanacions pràctiques, aplicables en la indústria.
[EN] Surface quality of machined parts highly depends on the surface texture that reflects the marks, left by the tool during the cutting process. The traditional theoretical approaches indicate that these marks are related to the cutting parameters (cutting speed, feed, depths of cut...), the machining type, the part material, the tool geometry, etc. But, different machining type and material selection can give a variable result. In nowadays, more progressively, High Speed milling techniques have been applied on hard-to-cut materials more and more extensively. High-speed milling involves a considerable number of process parameters that may affect the 3D surface topography formation. The hypothesis that surface topography parameters depends on the traces left by the tool, determined by working conditions and environmental properties, led to the development of a custom research methodology. This research work shows how the parameters combination, tool axis inclination, tool geometric deflection, cutting tool geometry and environment vibrational behavior, influence on 3D surface topography parameter Sz. The general model was divided in multiple parts, where additional process parameters influence has been described and included in general model proposed. The incremental process followed allows the author to develop a general mathematical model, step by step, testing and adding the components that affect surface topography formation the most. In the first part of the research a milling procedure with flat end milling tools was selected. First, tool geometry, combined with multiple cutting feed rates, is analyzed to distinguish the main parameters that affect surface topography. A prediction model is introduced with a basic topography height component, performed by cutting tool geometry. Next, specifically designed experiments were conducted, varying technological parameters. That starts with cutting tool axis inclination against the milling table analysis. The specimens of analysis are samples with 4 contrary aimed straight cutting paths. Linear paths in different directions give a chance to analyze milling machine spindle axis topography, as well as marks left from cutting tool back cutting edge. Considering the deviations of cutting marks observed in the images of the surface topography obtained through the measurements, the milling equipment and cutting tool dynamical behavior analysis were introduced. Vibrations produce deviations in the milling table and cutting tool. These deviations were detected and included in the mathematical model to complete the prediction model accuracy. Finally, the prediction model of the topography parameter SZ was tested with increased number of process parameters. Measured and predicted SZ values were compared and analyzed statistically. Results revealed high predicted topography deviation on samples manufactured with different machines and with different feed rates. Relevant conclusions about the manufacturing equipment accuracy have been drawn and they state that cutting tool's footprint is directly related with surface topography parameters. Besides, footprint influence is affected by cutting tool geometry, tool stiffness and equipment accuracy.
Logins, A. (2021). High speed milling technological regimes, process condition and technological equipment condition influence on surface quality parameters of difficult to cut materials [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/164122
TESIS
Belaud, Vanessa. "Structuration de surfaces au moyen d'un traitement laser femtoseconde : applications à la fonctionnalisation de surface du polypropylène en vue de sa métallisation." Thesis, Ecully, Ecole centrale de Lyon, 2014. http://www.theses.fr/2014ECDL0003/document.
Повний текст джерелаThis work presents the potential of a femtosecond laser surface treatment as an alternative step of pretreatments during the metallization of polymer. To do this, the study of chemical and morphological modification induced by femtosecond laser treatment and their respective influences on the properties of adhesion and wettability of polypropylene surface are presented. A literature review highlights the feasibility of a controlled surface modification after femtosecond laser treatment of polypropylene (PP). In addition, it is known that these modifications changes the wetting properties and can be used to meet industrial applications development. After femtosecond laser treatment, the treated surface responds to the solicitation with different morphological comportment according to its intrinsic properties. Experiences of localized impacts and surfaces us to observe three stages of topographic changes to the conditions studied: an incubation phenomenon of accumulation and ablation. The ablation phenomenon is further study. Generally, two linear ablation regime is observed for all power densities examined when considering the depth of ablation as a function of the pulse number and the ablation volume according to the accumulated power density. Finally, we show that the bonds present on the surface after treatment are dependent on two factors: the accumulated power density used and the working environment. Knowing that topographic obtained is multi-scales, the results were analyzed on the basis of models Wenzel (W)(1936) and Cassie–Baxter (CB) (1944) which explain the theory of wetting of rough surfaces. The experimental results and their correlations with 3D roughness parameters calculated at different scales were treated by statistical analysis. We observe a mixed model behavior with intimate contact of the drop on the tops of the asperities (Wenzel model) and a heterogeneous contact (air - PP) in a mesoscopic scale (state " fakir " described by the Cassie -Baxter model). However, this situation where the drop sits on the top of asperities (CB) is not always the most stable. We have studied the transition between the CB state and the W state by evaporation experiments. It is observed that this transition is strongly dependent on the surface chemistry whose contribution is much greater than the adhesion properties metal / PP. If controlling this property, it is possible to obtain two industrial applications: electroplating (increased adhesion by laser treatment) or electroforming (low adherence to replicate the topography)
Gläser, Philipp [Verfasser], Jürgen [Akademischer Betreuer] Oberst, Gregory [Akademischer Betreuer] Neumann, and Harald [Akademischer Betreuer] Hiesinger. "Evaluation of topography, slopes, illumination and surface roughness of landing sites near the lunar south pole using laser altimetry from the lunar reconnaissance orbiter / Philipp Gläser. Gutachter: Jürgen Oberst ; Gregory Neumann ; Harald Hiesinger. Betreuer: Jürgen Oberst." Berlin : Technische Universität Berlin, 2014. http://d-nb.info/1067388044/34.
Повний текст джерелаGläser, Philipp Andreas [Verfasser], Jürgen [Akademischer Betreuer] Oberst, Gregory [Akademischer Betreuer] Neumann, and Harald [Akademischer Betreuer] Hiesinger. "Evaluation of topography, slopes, illumination and surface roughness of landing sites near the lunar south pole using laser altimetry from the lunar reconnaissance orbiter / Philipp Gläser. Gutachter: Jürgen Oberst ; Gregory Neumann ; Harald Hiesinger. Betreuer: Jürgen Oberst." Berlin : Technische Universität Berlin, 2014. http://d-nb.info/1067388044/34.
Повний текст джерелаSekeres, Thiago de Souza. "Inter-relação entre parâmetros de rugosidade 2D/3D e a estampabilidade de chapas de aço de baixo carbono laminadas a frio para a indústria automotiva." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-16112015-161539/.
Повний текст джерелаThe stamping process is influenced by several variables such as sheet mechanical properties and roughness, blank lubrication, friction coefficient, press parameters (press force and speed), as well as variations in the forming tools (elastic strain). This work is dedicated to study the influence of friction between the tool and the blank. In this sense, it is necessary to study the development of artificial roughness patterns of sheet metals (surface textures). The aim of this research work is to study the inter-relationship, using the surface topography characterized by 2D and 3D roughness parameters and the formability of steel sheets for automotive panels. Different surface textures of sheet metal have been evaluated in terms of formability (measured by material flow during the process stamping) and tentatively related to roughness parameters (2D and 3D) obtained in the sheet metal prior to stamping. Some relevant tendencies have been established amongst these parameters. The results presented here are in accordance with other recently published research work showing that there is a clear relationship between these parameters, and that further detailed studies are needed.
Luc, Emilie. "Mécanisme d'initiation du collage lors du laminage à chaud des aciers inoxydables ferritiques stabilisés." Thesis, Valenciennes, 2013. http://www.theses.fr/2013VALE0041/document.
Повний текст джерелаHot rolling of stainless steel is one of the most important steps in manufacturing process regarding surface quality of the product. Stabilised ferritic stainless steels are widely used in automotive and cosmetic appliances but are also concerned by sticking phenomenon. These grades, having high dry corrosion and creep resistance, are enriched in specific chemical elements such as Cr, Nb or Ti, limiting also slab oxidation during hot rolling. Nevertheless, the mastered oxidation of slab surface is a way to protect metal surface from direct contact with rolls.In order to better understand initiation of sticking, a first campaign was based on topography and rolls surface state wear analysis. This study revealed that sticking initiation is not due to the presence of roll scratches which depth is higher than oxide layer thickness. Indeed, the probability that roll scratches are deeper than oxide layer thickness is very low.In a second time, a pilot was designed, reproducing tribological conditions of a roll bite, to better understand mechanisms that initiate sticking. Keeping in mind the importance of rolls and slab surface state, this pilot is able to use specimen taking from industrial products, having the original oxide layer surface. This second study highlighted the major role of silicium oxides on scale adherence and the high heterogeneity of this scale layer in thickness and in chemical composition
Masiagutova, Elina. "Étude de la génération des topographies de surfaces latérales issues du procédé LPBF pour un alliage d’aluminium AlSi10Mg." Thesis, Lyon, 2022. http://www.theses.fr/2022LYSEE002.
Повний текст джерелаIn the current study, surface generation during additive manufacturing (AM), especially the laser powder bed fusion (LPBF) process was studied. LPBF is a progressive process that can lead to new opportunities, such as applications that require complex structures (internal channels or lightweight lattice structures). It has therefore attracted considerable attention, which has led to research and development in many industries, particularly in the aerospace industry.A surface generation study to optimize surface roughness and material density by examining the influence of the primary LPBF process parameters was therefore performed. During this study, the relationship between the roughness of the top and side surfaces and the density of the material was established. This made it possible to determine the first window of optimal parameters.An analysis of the roughness dispersion and process reproducibility were then carried out. This analysis revealed a significant roughness dispersion, especially from one side to the other. As a result, recommendations on surface measurements have been proposed.The effect of different process options (secondary parameters) are also studied in order to better understand the generation of the side surface and optimize it. This study showed that compensations and contour settings are key parameters that can help reduce the side surface roughness. Indeed, the geometric positioning of the different weld tracks is an important issue that must be addressed to reduce surface roughness. Based on the results of this study, it is possible to reduce the average surface roughness Sa from 40 to 10 μm.Finally, this thesis presents a new approach to modeling side surfaces roughness (at 0°). The approach is based on the weld track geometry (radii of curvature). It allows to take into account the weld tracks and layers position in relation to each other and thus to predict the roughness for different scanning strategies, compensation parameters
Nunes, Eduardo. "Inter-relationship of skin pass, 2D and 3D roughness parameters, stampability and paintability on cold rolled steel sheets for the automotive industry." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-24112014-151802/.
Повний текст джерелаO foco do presente trabalho é o estudo, em condições industriais, da inter-relação entre grau de redução do passe de acabamento, topografia superficial caracterizada pelos parâmetros de rugosidade 2D e 3D, estampabilidade e aparência de pintura de chapas de aço para painéis automotivos. Diferentes texturas superficiais de chapas de aço foram analisadas em termos de aparência de pintura (rating e curvas espectrais) e tentativamente relacionadas com os parâmetros de rugosidades (2D e 3D) obtidos na chapa antes de estampar. Algumas tendências relevantes foram estabelecidas entre estes parâmetros. Os resultados presentes aqui estão de acordo com publicações recentes mostrando uma clara relação entre estes parâmetros e que trabalhos futuros ainda são necessários.
Xie, Wa. "Surface Topography and Aesthetics of Recycled Cross-Linked Polyethylene Wire and Cable Coatings." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc799512/.
Повний текст джерелаÅs, Sigmund. "Fatigue Life Prediction of an Aluminium Alloy Automotive Component Using Finite Element Analysis of Surface Topography." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-758.
Повний текст джерелаA 6082 aluminium alloy has been characterized with regard to the influence of surface roughness on fatigue strength.
Fatigue life testing of smooth specimens was used to establish reference curves for the material in extruded and forged T6 condition. The extruded material was found to have better fatigue strength than the forged material, although the cyclic stress-strain response was similar for both. The forged material was tested in T5, T6 and T7 tempers, showing no significant difference in fatigue strength.
Surface roughness was created by circumferential grinding of cylindrical test specimens, and the surface topography was measured using a white light interferometry microscope. The measurements proved to be accurate, although errors were observed for certain surface features. Residual stresses were quantified by X-ray diffraction. Compressive residual stresses of around 150 MPa were found in both rough and smooth specimens. Load cycling did not significantly alter the surface residual stresses.
Stress solutions ahead of all major surface grooves were found using a linear elastic material model. Estimates of cyclic stresses and strains were calculated in the notch roots using different Neuber corrections of the linear solution. The results were compared to finite element analysis employing a bilinear kinematic hardening model. A generalized version of the Neuber correction was found to be within 20% of the nonlinear finite element results.
Several empirical models for the notch sensitivity factor were investigated. These were found to be unable to describe the notch influence on fatigue life and initiation life. In order to follow this approach, it was recommended that different test specimens should be used where the short fatigue crack growth could be monitored.
It was shown that microstructural fracture mechanics theories could be used to estimate the fatigue limit of rough surfaces. In some cases, initiation from material defects or weaknesses would override the influence of surface geometry. In one specimen, the initiation appeared to have started as at a de-bonded grain, while in other cases, initiation was thought to have started at larger second phase particles embedded in notch roots. Further work in this area should focus on statistical descriptions of surface roughness, inherent material defects, and their interaction.
Rosenburg, Margaret Anne. "Interpretation of Lunar Topography: Impact Cratering and Surface Roughness." Thesis, 2014. https://thesis.library.caltech.edu/8408/7/Rosenburg_Margaret_2014_Ch1.pdf.
Повний текст джерелаEdachery, Vimal. "Influence of Surface Topography and Roughness on Lubrication, Friction and Scuffing in High Hardness Steels." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5499.
Повний текст джерелаGupta, Rajeev Kumar. "Influence of surface topography on wear and debris morphology of polymers." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/6093.
Повний текст джерелаDarafon, Abdalslam. "Measuring and Modeling of Grinding Wheel Topography." 2013. http://hdl.handle.net/10222/21678.
Повний текст джерелаBrygoła, Rafał. "Metody charakteryzacji profilu powierzchni soczewek kontaktowych z użyciem mikroskopii sił atomowych oraz optycznej mikroskopii konfokalnej." Doctoral thesis, 2021. https://depotuw.ceon.pl/handle/item/3886.
Повний текст джерелаIn the dissertation, the problem of measurement and characterization of surface topography of soft contact lenses using atomic force microscopy (AFM) and confocal microscopy was studied. The main goals of the work were: to analyze statistical parameters of popular contact lenses and to develop a uniform procedure for measuring contact lens surface using AFM. In the main experiment surface topography of seven silicone-hydrogel lenses was measured. A hypothesis was confirmed that material type and surface treatment process influence the surface topography. It was proved that new generation lenses exhibit smaller roughness that older ones. The impact of the type of AFM probe on surface topography measurements was also investigated. As a result of modification of the probe surface using trimethoxy(propyl)silane, the ability to visualize the surface topography of the material has been achieved, which, due to the strong attraction of the probe to the surface was not possible in the tapping mode with standard silicone probe. An important aspect analyzed in the dissertation was to understand the process of accumulation of deposits on the lens surface during wear. In the work the surface topography of both new and used lenses were investigated to analyze changes that occur during daily use. In the experiment the lens surfaces were compared for two regimes of care: continuous operation and lenses subjected to daily care. The lenses used in the continuous regime exhibited higher roughness in comparison with the new lenses. This result is not obvious since for certain lens types lower roughness is achieved during use because of deposits that fill gaps in the surface. The measurement of lenses subjected to the daily procedure of cleaning resulted in lower surface roughness when compared with lenses in the continuous regime of operation. In the case of both care procedures the roughness was still higher than in the case of new lenses. Changes in the surface topography of one-day contact lens that result from the wear were also investigated. Similarly to monthly lenses for one-day lenses the surface topography changes were observed but at the same time were smaller than for monthly lenses due to shorter time of operation. The possibility of characterization of the surface topography of contact lenses using confocal microscopy was also investigated. The use of this type of microscope is cheaper and less invasive than of AFM, and potentially allows to inspect changes during the daily use. The images were analyzed that are distributions of maximum optical response. The obtained results show that there is a relationship between the surface roughness of the lenses and the optical response, however, it is not possible to use the commonly used global statistical parameters to evaluate and compare the surface roughness of the lenses. An attempt was made to develop a parameter related to the surface roughness of contact lenses using the optical response obtained with a confocal microscope. However, preliminary analysis showed that despite the visual differences between the images, the global statistical parameters used in the analysis of the AFM images are not applicable to the analysis of confocal microscopic images. Additionally, granulometric analysis of the confocal microscope images was performed, which gave an inconclusive result, suggesting that the index related to surface roughness should be developed using more advanced local image analysis methods or other numerical tools.