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    Wyświetlanie 1-2 z 2
    Tytuł:
    Experimental investigations of strain localization in concrete using Digital Image Correlation (DIC) technique
    Autorzy:
    Kozicki, J.
    Tejchman, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/241130.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    concrete beams
    digital image correlation
    fracture process zone
    strain localization
    three-point bending
    Opis:
    The paper presents results of experimental investigations of strain localization in concrete using a non-destructive method called Digital Image Correlation (DIC) technique. This technique measures surface displacements from digital images. The model tests were carried out with notched concrete specimens under three-point bending. Three different beam sizes and two different concrete mixes were used. During experiments, load--deflection curves and evolution of fracture process zone were determined. The measured size effect in strength was compared with the deterministic size effect law by Bazant (1984) and experimental results by Le Bellégo et al (2003).
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2007, 54, 1; 3-24
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coda wave interferometry for monitoring the fracture process of concrete beams under bending test
    Autorzy:
    Knak, Magdalena
    Wojtczak, Erwin
    Rucka, Magdalena
    Powiązania:
    https://bibliotekanauki.pl/articles/27311414.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    non-destructive testing
    concrete beams
    crack detection
    fracture process
    ultrasonic waves
    coda wave interferometry
    digital image correlation
    badania nieniszczące
    wykrywanie pęknięć
    proces pękania
    fale ultradźwiękowe
    interferometria fal koda
    cyfrowa korelacja obrazów
    belka betonowa
    Opis:
    Early detection of damage is necessary for the safe and reliable use of civil engineering structures made of concrete. Recently, the identification of micro-cracks in concrete has become an area of growing interest, especially when it comes to using wave-based techniques. In this paper, a non-destructive testing approach for the characterization of the fracture process was presented. Experimental tests were performed on concrete beams subjected to mechanical degradation in a 3-point bending test. Ultrasonic waves were registered on a specimen surface by piezoelectric transducers located at several points. Then, the signals were processed taking advantage of wave scattering due to micro-crack disturbances. For early-stage damage detection, coda wave interferometry was used. The novelty of the work concerns the application of the complex decorrelation matrix and the moving reference trace approach for better distinguishment of sensors located in different parts of a crack zone. To enhance coda wave-based damage identification results, optical imaging of crack development was performed by means of digital image correlation measurement. The results obtained showed that the coda wave interferometry technique can be successfully used as a quantitative measure of changes in the structure of concrete. The results also indicated that the course of decorrelation coefficient curves enabled the identification of three stages during degradation, and it depended on the location of acquisition points versus the crack zone.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 3; art. no. e144118
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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