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Wyszukujesz frazę "optical scanning" wg kryterium: Temat


Tytuł:
Analysis of geometric errors of throat sizes of last stage blades in a mid-size steam turbine
Autorzy:
Eret, Petr
Hoznedl, Michal
Powiązania:
https://bibliotekanauki.pl/articles/2142353.pdf
Data publikacji:
2022
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
steam turbine
blade throat
3D optical scanning
geometric deviation
Opis:
Steam turbine technology with enhanced flexibility will continue to participate in electric power supply mixes. Last stage blades secure the reliability of a steam turbine and require high precision manufacturing and assembly. This case study presents a statistical analysis of geometric errors of the throat sizes of the last stage blades in a mid-size steam turbine. A 3D optical scanner is employed to capture detailed geometries of rotor blades and a half of assembled nozzle diaphragm. Unrolled cylinder cross-sections are used to evaluate 2D geometrical features such as blade throats and areas at three different diameters, and the results are compared to intended designs. In addition, linear correlations between the throat size and blade pitch, area and trailing edge thickness are established, and blade throat position shifts are quantified. Such a comprehensive study is presented for the first time, and some useful conclusions can be retrieved from this case study.
Źródło:
Journal of Machine Engineering; 2022, 22, 3; 132--147
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of process parameters on dimensional accuracy of parts manufactured using fused deposition modelling technology
Autorzy:
Górski, F.
Kuczko, W.
Wichniarek, R.
Powiązania:
https://bibliotekanauki.pl/articles/101920.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
rapid prototyping
fused deposition modelling
3D optical scanning
manufacturing accuracy
Opis:
The paper presents the results of experimental study – part of research of additive technology using thermoplastics as a build material, namely Fused Deposition Modelling (FDM). Aim of the study was to identify the relation between basic parameter of the FDM process – model orientation during manufacturing – and a dimensional accuracy and repeatability of obtained products. A set of samples was prepared – they were manufactured with variable process parameters and they were measured using 3D scanner. Significant differences in accuracy of products of the same geometry, but manufactured with different set of process parameters were observed.
Źródło:
Advances in Science and Technology. Research Journal; 2013, 7, 19; 27-35
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of manufacturing processes on blade throat size and position in a steam turbine diaphragm
Autorzy:
Eret, Petr
Hoznedl, Michal
Powiązania:
https://bibliotekanauki.pl/articles/2142357.pdf
Data publikacji:
2022
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
steam turbine
diaphragm
blade throat
manufacturing process
geometric deviation
3D optical scanning
Opis:
Despite a sustainable energy future, steam turbines are requisite for the reliability and security of the electric power supply in many countries. Accurate and precise manufacturing of the steam path is crucial to turbine efficiency. Before entering the rotor blades, the steam must be correctly guided using stationary blading in a diaphragm. Steam turbine diaphragms are complicated components to manufacture, and welding is the most common fabrication method. A case study presented in this paper employs data from a 3D optical scanner for a geometric deviation analysis of the upper half of the diaphragm at two production steps, after complete welding and after final machining. Unrolled cylinder cross-sections at different diameters are used to evaluate the blade throat sizes and positions compared to the nominal geometry. The results indicate significant geometric changes between the two fabrication steps, and several suggestions are put forward for targeted future work.
Źródło:
Journal of Machine Engineering; 2022, 22, 3; 148--160
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena wielkości zużycia matrycy do kucia pierścieni synchronizatora na podstawie optycznego skanowania i badań metalograficznych
Wear analysis of die for forging of synchronizer rings based on optical scanning and metallographic examinations
Autorzy:
Pachutko, B.
Lulkiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/211905.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Obróbki Plastycznej
Tematy:
skanowanie optyczne
zużycie powierzchni
azotowanie gazowe
matryca kuźnicza
optical scanning
surface wear
gas nitriding
forging die
Opis:
W publikacji przedstawiono wyniki optycznego skanowania matrycy do kucia pierścieni synchronizatora typu 682 oraz badań metalograficznych, które przeprowadzono po eksploatacji matrycy. Matrycę wytworzono i eksploatowano w Fabryce Armatur „Swarzędz” Sp. z o.o. Matrycę po ulepszeniu cieplnym azotowano gazowo metodą ZeroFlow w Politechnice Poznańskiej, w procesie dwustopniowym przy następujących parametrach: I stopień: 490°C, 1 h, Np=15 atm-1 II stopień: 550°C, 43,5 h, Np=0,3 atm-1/2. Warstwa azotowana charakteryzowała się twardością przy powierzchni ok. 1000 HV 0,1, grubością wynoszącą 0,25 mm i jedynie drobnymi wydzieleniami azotków żelaza w strefie azotowania wewnętrznego. Technologia azotowana metodą ZeroFlow miała być konkurencyjna do technologii azotowania jarzeniowego prowadzonego w temperaturze ok. 550°C w czasie 10 h pod względem braku występowania siatkowego układu wydzieleń fazy γ’ w strukturze strefy dyfuzyjnej α. We wcześniej prowadzonych badaniach zaobserwowano podatność warstwy azotowanej z siatkowym układem wydzieleń azotków żelaza do jej wykruszania podczas eksploatacji. Optyczne skanowanie matrycy wykonano po procesie azotowania i po eksploatacji matrycy. Planowano wykonanie 3000 sztuk pierścieni synchronizatora na badanej matrycy. Jednak po 2500 cyklach kucia pierścieni stwierdzono wyginanie się kolejnych pierścieni. Dlatego przeprowadzono badania metalograficzne na próbkach wyciętych z matrycy w celu wyjaśnienia przyczyny jej przedwczesnego zużycia. Największe zużycie materiału matrycy wystąpiło w obszarach promienia powierzchni kształtującej powierzchnię pierścienia synchronizatora i krawędzi otworu o średnicy ok. 104 mm. W tych obszarach zaobserwowano największe pęknięcia i największą redukcję grubości warstwy azotowanej.
This publication presents the results of optical scanning of a 682-type die for forging of synchronizer rings and of metallographic examinations, which were performed after exploitation of the die. The die was manufactured and exploited at the Fabryka Armatur “Swarzędz” Sp. z o.o. After heat treatment, the die was subjected to ZeroFlow gas nitriding at the Poznań University of Technology, in a two-step process according to the following parameters: 1st step: 490°C, 1 h, Np=15 atm-1 2nd step: 550°C, 43.5 h, Np=0.3 atm-1/2. The nitrided layer was characterized by near-surface hardness of approx. 1000 HV 0.1, thickness amounting to 0.25 mm, and only fine precipitations of iron nitrides in the interior nitriding zone. ZeroFlow nitriding technology was to be competitive to ion nitriding conducted at a temperature of approx. 550°C over 10 h due 108 Ocena wielkości zużycia matrycy do kucia pierścieni synchronizatora na podstawie... Pachutko Beata, Jarosław Lulkiewicz. 2016. „Ocena wielkości zużycia matrycy do kucia pierścieni synchronizatora na podstawie optycznego skanowania i badań metalograficznych”. Obróbka Plastyczna Metali XXVII (2): 107–118. to the absence of a network of γ’-phase precipitations in the structure of the α diffusion zone. Susceptibility of nitrided layers with a network system of iron nitride precipitations to chipping during operation was observed in earlier studies. Optical scanning of the die was performed after the nitriding process and after exploitation of the die. It was planned to make 3000 synchronizer rings using the studied die. However, after 2500 ring forging cycles, bending of rings was observed. This is why metallographic examinations were performed on specimens cut out from the die in order to explain the causes of its premature wear-out. The greatest die wear occurred in areas of the radius of the surface forming the surface of the synchronizer ring and the edge of the hole with a diameter of approx. 104 mm. The largest cracks and greatest reduction of the nitrided layer were observed in these areas.
Źródło:
Obróbka Plastyczna Metali; 2016, 27, 2; 107-118
0867-2628
Pojawia się w:
Obróbka Plastyczna Metali
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of acceleration of different dynamic microobjects by the television scanning optical microscope
Autorzy:
Prudyus, I.
Matiieshyn, Y.
Powiązania:
https://bibliotekanauki.pl/articles/114123.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
television scanning optical microscope
microscope field of view
acceleration of movement
Opis:
The acceleration of the dynamic microobjects (MO) movement, the motion of which is accelerated uniformly or non-uniformly is an important task for television measuring systems. Most existing measuring systems usually have a small range of acceleration with a short period of growth. Such period of growth of the acceleration is characteristic for many dynamic MO. Better instruments to determine the non-uniform velocity of the various objects are based on various laser devices. These instruments are contactless and high-speed enough. In the paper the basics of the television scanning optical microscope (TSOM) are presented. In the Chapter 2 the schematic diagram of the TSOM and its main functionalities are pointed out. In the Chapter 3 an adaptation of the TSOM for movement acceleration of microobjects is discussed. Modified structural and functional diagram of the instrument is presented.
Źródło:
Measurement Automation Monitoring; 2015, 61, 8; 410-412
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Signal-to-noise ratio improvement in scanning television optical microscope
Autorzy:
Prudyus, I.
Shkliarskyi, V.
Hudz, B.
Rehush, A.
Powiązania:
https://bibliotekanauki.pl/articles/114383.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
scanning television optical microscope
cathode ray tube
noise
photomultiplier tube
Opis:
Scanning television optical microscope is designed to investigate microscopic objects, larger than 0.1 micrometers. To illuminate microobject with this microscope there is used a high resolution cathode ray tube. Low illumination of the tested microobject lets to explore living microorganisms in real time. The current microscopic image has low contrast. To increase image contrast it is necessary to increase microscope sensitivity. The main sources of noise in scanning television optical microscope are: 1) composite video shaper; 2) photomultiplier tube; and 3) scanning cathode ray tube. Detailed analysis of noise sources in video signal of the microscope is presented in the paper. Equations describing the sources are given. Dependencies are plotted and discussed.
Źródło:
Measurement Automation Monitoring; 2015, 61, 8; 406-409
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scanning optical and electron microscopes with computer image acquisition
Autorzy:
Konstankiewicz, K.
Pukos, A.
Powiązania:
https://bibliotekanauki.pl/articles/25623.pdf
Data publikacji:
1995
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
electron microscope
scanning optical microscope
microscopic method
tandem scanning reflected light microscope
computer image analysis
scanning electron microscopy
biological material
rotary microtome
confocal microscopy
Źródło:
International Agrophysics; 1995, 09, 4
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Long range measurements using a contactless low cost optical sensor
Autorzy:
Krelling, P C L
Gonzalez-Jorge, H.
Armesto, J.
Arias, P.
Powiązania:
https://bibliotekanauki.pl/articles/174034.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
laser scanning
accuracy
optical sensor
Opis:
Length measurement is very common in many industrial applications and there is a number of instrumentation involved, mainly dependent on the range and accuracy requirements. In this work, a contactless optical measurement unit is developed. It is based on a mouse sensor and an external laser source. The system is calibrated using an optical board and an electronic distance measuring system. Accuracy and precision of the system is evaluated using the reference data from a total station. Values of 1 mm and 0.3 mm are respectively obtained. Length range during the experiment is 8.5 m. The data of the optical measurement unit are compared with those obtained from a commonly used wheel encoder. Results from the optical sensor of the mouse improve the encoder data.
Źródło:
Optica Applicata; 2013, 43, 3; 435-440
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Weryfikacja wymiarowa pierwszej wypraski w systemie skanowania 3D
Dimensional revision of the first moulded piece with 3D scanning system
Autorzy:
Śmierzchalski, D.
Daniluk, T.
Powiązania:
https://bibliotekanauki.pl/articles/395669.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
skanowanie
3D
pomiar optyczny
scanning
optical measurement
Opis:
W pracy skupiono się na uzyskaniu pełnej informacji wymiarowej o wyprasce wtryskowej. Omówiono szczegółowo wpływ czynników zewnętrznych na dokładność pomiaru, wskazano również cechy wyrobu niekorzystnie z metrologicznego punktu widzenia. W dalszej części opisano zagadnienia modelowania, które pozwala skrócić czas opracowania narzędzi. Podsumowanie uzupełniono perspektywą rozwoju optycznych systemów skanowania 3D.
This paper is focused on gathering full geometrical information about molding specimen. Details about the influence of environment end external factors on measuring accuracy are given, so as specimen features disadvantageous from metrological point of view. Next part refers to the problem of modeling that makes time of new molding tool work out much shorter. To sum up a possible, future researches on optical 3-D scanning systems is described.
Źródło:
Postępy Nauki i Techniki; 2011, 6; 113-119
2080-4075
Pojawia się w:
Postępy Nauki i Techniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Complexing Agent on the Structural, Optical and Electrical Properties of Polycrystalline Indium Sulfide Thin Films Deposited by Chemical Bath Deposition
Autorzy:
Göde, F.
Kariper, İ.
Güneri, E.
Ünlü, S.
Powiązania:
https://bibliotekanauki.pl/articles/1031534.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
scanning electron microscopy
thin film
optical constant
growth from solutions
Opis:
Indium sulfide (β-In₂S₃) thin films are synthesized by chemical bath deposition method using three different complexing agent volumes, triethanolamine (TEA) (0.30, 0.45, and 0.60 ml). The effect of complexing agent on the structural, morphological, optical and electrical properties of chemically deposited indium sulfide (β-In₂S₃) thin films have been investigated in this work. The characterization of the present films is carried out using X-ray diffraction, scanning electron microscopy, UV-vis spectroscopy and electrical measurements. The structure of the films is polycrystalline with a cubic phase of β-In₂S₃. Firstly, the band gap of the film decreases from 3.74 eV to 3.15 eV by adding 0.30 ml TEA. Then, it increases to 3.79 eV with increasing TEA. Nevertheless, previously, the refractive index of the films increases from 2.13 to 2.67 for the 0.30 mL TEA and then it decreases to the value of 2.11 with increasing TEA. Extinction coefficient, real and dielectric constant of the films are calculated using the absorption and transmittance spectra. Firstly, the electrical resistivity of the films decreases from 3.46×10⁸ Ω cm to 1.33×10⁷ Ω cm by adding 0.30 ml TEA. Then, it increases to the value of 2.16×10⁹ Ω cm with increasing TEA. Eventually, the more conductive film with worm-like morphology detected from the scanning electron microscopy is synthesized using 0.30 ml TEA. These results show that complexing agent has an important effect on the structural, morphological, optical and electrical properties of the deposited films.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 527-530
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the electrolytically polished skeletal dentures surfaces using various nano- and microscopic technologies
Autorzy:
Dąbrowa, Tomasz
Majstrzyk, Wojciech
Tamulewicz, Magdalena
Piasecki, Tomasz
Kunicki, Piotr
Więckiewicz, Włodzimierz
Gotszalk, Teodor
Powiązania:
https://bibliotekanauki.pl/articles/306706.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
chropowatość powierzchni
skaningowa mikroskopia elektronowa
proteza ruchoma
mikroskopia skaningowa
surface roughness
scanning electron microscopy
removable partial denture
scanning probe microscopy
optical profilometry
Opis:
The surface roughness of the dental restorations is significant to the denture plaque adhesion. Methods: In this work, we present the complex analysis of the electropolished CoCrW alloy remanium® star (Dentaurum, Germany) samples with laserengraved fiducial marks performed using complementary set of micro- and nanoscopic techniques: optical profilometry (OP), atomic force microscopy (AFM), scanning electron microscopy (SEM) and focused ion beam (FIB) milling. Results: Both mean and RMS roughness of the samples were reduced by electopolishing process, however, the results obtained using OP and AFM exhibited some discrepancies. This was caused by the relatively high local protruding defects developed on the processed surface. The cross-sections of the protrusions were made to analyze the cause of their formation as the EDS elemental content maps revealed that their composition was uniform. We also analyzed the local roughness in the smaller areas free from the defects. Conclusions: In that case, both OP and AFM techniques delivered the same results. Analysis of results showed that various methods used for the surface roughness evaluation have to be used simultaneously to obtain complete and true analysis of the technological CoCrW samples.
Źródło:
Acta of Bioengineering and Biomechanics; 2019, 21, 4; 123-129
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cast iron component failure: A metallurgical investigation
Autorzy:
Sudhakar, K. V.
Powiązania:
https://bibliotekanauki.pl/articles/382757.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cast iron
hardness test
optical microscopy
scanning electron microscopy
fractography
żeliwo
testy twardości
mikroskopia optyczna
mikroskop skaningowy
Opis:
A fractured nutcracker was examined for determining the root cause/s for premature fracture/failure. This is one of the common tools used typically for cracking hard nuts. In this study, metallurgical failure analysis techniques namely, visual inspection, optical microscopy, SEM, and hardness tests were used in investigating the broken product. From the metallurgical analysis, it was determined that the combined effect of low carbon equivalent and presence of inclusions contributed to the sudden fracture of the nut cracking tool.
Źródło:
Archives of Foundry Engineering; 2012, 12, 2s; 67-70
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Torsional Strength of Pa2200 Material Shape Additively with the Selective Laser Sintering Technology
Autorzy:
Bernaczek, Jacek
Dębski, Mariusz
Gontarz, Małgorzata
Grygoruk, Roman
Józwik, Jerzy
Kozik, Bogdan
Mikulski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2201927.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
torsional strength
PA2200 powder
additive manufacturing
SLS technology
SLS
Selective Laser Sintering
optical measurements
3D scanning
Opis:
The purpose of the undertaken research work is to analyze the torsional strength of standard samples with a circular cross-section, produced additively using the SLS (Selective Laser Sintering) technique – sintering PA2200 polyamide powders. The studies conducted so far have not included a static torsion test, the results of which are crucial for parts such as machine shafts, hubs, couplings, etc. Hence the idea of conducting the research in question. The samples were made in different settings relative to the machine's working platform and subjected to post-processing in two variants – by water-soaking and furnace-heating – in order to determine the influence of the orientation of the model in the manufacturing process and the type of post-processing on torsional strength. The produced samples were additionally subjected to a preliminary dimensional and shape verification due to the significant impact of the accuracy of the models in the SLS process on the operation of the above-mentioned machine parts. Based on the analysis of the test results, it was found that the highest torsional strength was determined for the furnace-heated samples. In addition, the highest mapping accuracy was found for models positioned vertically in relation to the machine's working platform.
Źródło:
Advances in Science and Technology. Research Journal; 2023, 17, 2; 12--24
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perspektywy zastosowań laserowych skanerów pomiarowych do analizy deformacji struktur kompozytowych
Prospects of laser measuring scanner applications for the analysis of the deformation of composite structures
Autorzy:
Bondyra, A.
Chwał, M.
Pastuszak, P. D.
Powiązania:
https://bibliotekanauki.pl/articles/278204.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Inżynierii Materiałów Polimerowych i Barwników
Tematy:
skanowanie laserowe
skaner laserowy
skaner pomiarowy
skaner optyczny
deformacja struktury
kompozyt
laser scanning
laser scanner
measuring scanner
optical scanner
structure deformation
composite
Opis:
Prezentowana praca związana jest z wykorzystania laserowych skanerów pomiarowych w odniesieniu do struktur kompozytowych. W pracy omówiono działanie skanerów i techniki skanowania oraz przedstawiono podstawowe zastosowania skaningu w analizie deformacji struktur kompozytowych tj. szybkie prototypowanie, naprawa uszkodzeń, modelowanie MES oraz pomiar geometrii. Analiza deformacji struktur kompozytowych przy użyciu skanowania w odniesieniu do szybkiego prototypowania umożliwia optymalizację i przeprojektowanie konstrukcji. Ponadto pozwala na wydajniejsze przeprowadzenie naprawy uszkodzeń i recyklingu. Daje także możliwość tworzenia i walidacji modeli MES poprzez porównanie deformacji uzyskanych z badań eksperymentalnych i obliczeń numerycznych. Jednakże największe możliwości skaningu laserowego w analizie deformacji związane są z pomiarem wielkości geometrycznych. W pracy dokonano wstępnej analizy deformacji kompozytowej powłoki cylindrycznej przy użyciu skaningu laserowego celem zobrazowania możliwości wykorzystania danych pomiarowych.
The presented paper is dedicated to the application of laser measuring scanners with reference to composite structures. The scanners and scanning techniques are discussed and their applications in composite structures deformation analysis i.e. rapid prototyping, damage repair, FEM modeling and the measurement of geometry are presented. The deformation analysis of composite structures using scanning with reference to the rapid prototyping provides the opportunities for optimization and reconstruction. Moreover, it allows for more efficient reparation of damage and recycling. It also offers a possibility for both the creation and validation of FE models by comparing the deformation from experiments with numerical calculations. However, the most important abilities of the laser scanners in the analysis of the deformation are connected with the measurement of geometry. In the presented work, the preliminary analysis of the deformation of the cylindrical composite panel with the help of the laser measuring scanner is presented in order to validate the possibility of using the measured data.
Źródło:
Przetwórstwo Tworzyw; 2014, [R.] 20, nr 1 (157), 1 (157); 4-11
1429-0472
Pojawia się w:
Przetwórstwo Tworzyw
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-body wear simulation influence on some direct and indirect dental resin biocomposites : A qualitative analysis
Autorzy:
Caracostea, A.
Morar, N.
Florea, A.
Soanca, A.
Badea, M. E.
Powiązania:
https://bibliotekanauki.pl/articles/307539.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
mikroskop elektronowy skaningowy
skaningowy mikroskop elektronowy
mikroskop optyczny
system CAD
biokompozyt
scanning electron microscopy
optical microscopy
two-body wear
CAD system
advanced biocomposites
Opis:
Purpose: The aim of this study was to qualitatively assess the outcomes of two in vitro aging methods, thermal-cycling and twobody wear simulation accomplished with a dual-axis chewing device, on the surface characteristics of eight direct and indirect dental resin biocomposites. Methods: Eighty mesial-occlusal-distal dental cavities were restored with four direct nanohybrid composite materials and with four nano- and micro-hybrid lab-fabricated resin composite inlays. After the restored teeth were subjected to thermal-cycling and wear simulation based on mechanical loading, the surface texture features of the restorations were separately analysed for each of the methods, on epoxy resin models using a digital camera, computer-aided-design system, optical stereo-microscopy and scanning electron microscopy. Results: All the dental restorative resin based composites used in this investigation displayed different cyclic wear patterns after undergoing mechanical loading. After thermal-cycling, the group of resin composite inlays showed a better adaptation, a smoother and more polished occlusal surface compared with direct restorative materials. Only two of direct nanohybrid resin composites performed better after two aging methods. One nanohybrid and the other two microhybrid resin inlays did not perform as expected when they were subjected to simulated wear compared to the rest of test materials. Conclusions: The use of the two-body wear simulation method revealed important information about the behavior of the dental resin-based composites when multiple oral factors are involved in a lab-simulated condition. Furthermore, the macro- and micro-morphological analysis showed different abrasion patterns among the materials being tested according to the filler percentage and distribution of the particles within the resin matrix.
Źródło:
Acta of Bioengineering and Biomechanics; 2016, 18, 3; 61-72
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł

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