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    Wyświetlanie 1-5 z 5
    Tytuł:
    Investigations of material behaviour under monotonic tension using a Digital Image Correlation system
    Autorzy:
    Szymczak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/281605.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    geometrical imperfection
    notch
    extensometer
    DIC
    non-contact technique
    Opis:
    The paper reports behaviour of engineering materials for different kinds of notches, i.e. having U, V shapes. Their variants with respect to dimensions are illustrated in static and fatigue tests. The influence of these types of geometrical imperfections on material fatigue is presented using variations of the Wöhler curve, number of cycles to failure and the fatigue notch factor. Results of experiments conducted by the use of the Digital Image Correlation system called 4M Aramis are illustrated. Courses of tensile characteristics of the 41Cr4 steel, obtained by means of both techniques: extensometer and DIC are compared. They indicated that the DIC technique can be a good tool for determination of mechanical properties. The equivalent strain full-field distributions on specimens tensioned with and without imperfections up to material fracture are presented. The influence of U and V notches on variations of tensile curves is shown.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2018, 56, 3; 857-871
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metoda i urządzenie do pomiarów profili pierścieni tłokowych
    The method and apparatus for measurements of piston ring profiles
    Autorzy:
    Giesko, T.
    Zbrowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/156857.pdf
    Data publikacji:
    2009
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    pierścień tłokowy
    kontrola jakości
    pomiar profilu
    pomiar stykowy
    piston ring
    quality inspection
    profile measurement
    contact technique
    Opis:
    W artykule zaprezentowano metodę i urządzenie do pomiarów profili pierścieni tłokowych w ramach kontroli międzyoperacyjnej lub końcowej. W mechatronicznej głowicy pomiarowej zastosowano precyzyjny jednoosiowy czujnik przemieszczeń do wyznaczania konturu w układzie współrzędnych X-Y. Program systemu umożliwia wyznaczenie parametrów profilu pierścienia, takich jak: wysokość baryłki, przemieszczenie wierzchołka baryłki, kąt pochylenia w pierścieniu trapezowym. Opracowane urządzenie zostało wdrożone i jest wykorzystywane w kontroli jakości w fabryce pierścieni tłokowych.
    Portable testers for rapid measuring in product inspection can facilitate the manufacturing control and quality management processes in automotive industry. The paper presents the method and apparatus for measurements of piston ring profiles dedicated to the inter-operational and final inspection. The applied method is based on the contact technique. A mechatronic measurement head with the embedded uniaxial length gauge enables measurements of the piston ring profile in the X-Y coordinate system. The measuring head is moved vertically by a linear stepper motor. In order to protect the length gauge against radial forces, an intermediate setup with a linear bearing slide between the gauge and the piston ring has been applied. The correct positioning of the piston ring before measurements is realised by means of the hand-operated mechanism, while the developed software algorithms are used for the system calibration. Based on the measurement data, the piston ring face contour has been drawn. The implemented software enables the user to determine the piston profile parameters such as: barrel height, barrel top displacement and taper angle in the taper faced piston ring. These parameters are automatically calculated and shown on the chart. The measurement accuracy is 2 žm for the sampling step and 5 žm along the contour. All the pattern piston ring profiles and measurement results are stored in the computer database. The developed apparatus is implemented and used for the product inspection in the Polish, leading piston ring manufacture.
    Źródło:
    Pomiary Automatyka Kontrola; 2009, R. 55, nr 5, 5; 314-317
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of non-contact geodetic measurement techniques in dam monitoring
    Autorzy:
    Zaczek-Peplinska, Janina
    Kowalska, Maria
    Powiązania:
    https://bibliotekanauki.pl/articles/2173994.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    inżynieria hydrotechniczna
    zapora
    monitorowanie
    pomiar geodezyjny
    metoda bezkontaktowa
    hydrotechnical engineering
    dam
    monitoring
    geodetic measurement
    non-contact technique
    Opis:
    The maintenance of dams, including the protection of reservoir and flood embankments, requires regular control measurements and assessment of their technical condition. The choice of measurement methods, especially in terms of their speed and reliability, become crucial especially when the facilities are endangered due to a natural disaster. However, despite the enormous rapid development of modern geodetic measurement techniques, measurements at most dams are still conducted using classical techniques, such as angular-linear or leveling measurements which require interference with the measured structure. In addition, they need to be personally performed by employees or require visual inspections of the structure or in its protection zone. This article presents non-contact geodetic measurement techniques, such as terrestrial laser scanning, remote sensing classification of intensity and thermovision images recorded with various measurement sensors, digital image correlation, digital photogrammetry, or UAV. They are presented and compared in terms of their reliability, efficiency and accuracy of the obtained data, and the possibility of their automation and integration. As surveyors and hydraulic and geotechnical engineers are increasingly turning to modern measurement technologies, the aim of this paper is to help in selecting appropriate and effective monitoring tools ensuring fast and safe measurements crucial for the safety and maintenance of concrete structures. It presents examples of research based on the use of the modern measuring techniques carried out in recent years by employees of the Faculty of Geodesy and Cartography at the Warsaw University of Technology.
    Źródło:
    Archives of Civil Engineering; 2022, 68, 3; 49--70
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wettability of quartz particles at varying conditions on the basis of the measurement of relative wetting contact angles and their flotation behaviour
    Autorzy:
    Gao, Shuling
    Ma, Lifeng
    Wei, Dezhou
    Shen, Yanbai
    Powiązania:
    https://bibliotekanauki.pl/articles/109832.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    relative wetting contact angle
    Washburn technique
    surface free energy
    flotation behaviour
    sodium oleate
    Opis:
    In this paper, on the basis of a modified Washburn equation, the squared incremental pressure due to liquid rising vs. time were measured instead of wicking distances before reaching equilibrium, and the relative wetting contact angles (RWCA) were applied to characterize the surface wettability of quartz particles conditioned at different concentrations of flotation reagents. Combined with the flotation experiments on quartz particles at corresponding conditions, the relationship between flotation recoveries and RWCA was analysed, which proves that RWCA can characterize the surface wettability of quartz particles accurately. The results also showed that the best reagent conditions for floating quartz are pH 12.0, a Ca2+ concentration of 1×10-3 mol/dm3 and a sodium oleate concentration of 0.75×10-3 mol/dm3, where the recovery of quartz is 86%. The surface tension of the filtrate of the pulp was determined by a fully-automatic tensiometer as well. Based on the measured values of RWCA and surface tension, the free energy changes (ΔG) before and after the adhesion of bubbles and particles per unit area at corresponding situations were calculated, respectively. The trends of ΔG varying with the concentrations of reagents were in close accordance with those of RWCA and the flotation recoveries, proving that it is more likely for particles having bigger contact angles to adhere to bubbles, resulting in a higher flotation recovery. These results give a more feasible and accurate approach to analysing the surface wettability and floatability of fine particles.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 1; 278-289
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Results of Non-Contact Coordinate Measurement of a Cutting Tool Applied for Mould Machining
    Autorzy:
    Bazan, Anna
    Magdziak, Marek
    Jamuła, Barbara
    Powiązania:
    https://bibliotekanauki.pl/articles/11236770.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    cutting tools
    tool wear monitoring
    mould machining
    measuring technique
    non-contact measurements
    accuracy of measurements
    narzędzia skrawające
    zużycie narzędzi
    obróbka form
    technika pomiarowa
    pomiar bezkontaktowy
    dokładność pomiaru
    Opis:
    One of the main problems of machining of moulds is the need for an effective monitoring system of wear of cutting tools. This paper presents the results of coordinate measurements of a cutting tool which were obtained by using the non-contact measuring system based on the ACCURA II coordinate measuring machine equipped with the LineScan laser measuring probe and the Calypso metrology software. Investigations were carried out for several measurement strategies including different measurement resolutions and scanning speeds. The results of the coordinate measurements obtained by using the above-mentioned coordinate measuring system were compared to the reference data measured by means of the InfiniteFocus microscope. The measurement results were analysed by means of two software packages: Focus Inspection and Zeiss Reverse Engineering. The point clouds measured by using the LineScan probe were characterized by the selected deviation statistics equal to 4-6 μm when a good match between measurement points and the reference data was obtained. Moreover, these statistics mainly depend on the measurement resolution. The results of the performed experimental research allowed for drawing conclusions concerning the significance of the effect of the adopted measurement strategies on the results of the non-contact coordinate measurements of the selected cutting tool. The application of the non-contact coordinate measurements to the above-mentioned measurement task may contribute to the development of regeneration methods for cutting tools applied for mould manufacturing.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 4; 121--127
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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