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    Wyświetlanie 1-6 z 6
    Tytuł:
    A study on microbial self-healing concrete using expanded perlite
    Autorzy:
    Amjad, Usama Bin
    Siddique, Muhammad Shahid
    Shahid, Taha
    Ahmed, Iftikhar
    Alogla, Saleh M.
    Ahmad, Jawad
    Powiązania:
    https://bibliotekanauki.pl/articles/27311428.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    concrete
    self-healing
    bacteria
    expanded perlite
    crack detection
    beton
    bakteria
    wykrywanie pęknięć
    samonaprawialność
    perlit ekspandowany
    Opis:
    The increasing concern for the safety and sustainability of structures is calling for the development of smart self-healing materials and preventive repair methods. This research is carried out to investigate the extent of self-healing in normal-strength concrete by using Sporosarcina aquimarina – NCCP-2716 immobilized in expanded perlite (EP) as the carrier. The efficacy of crack-healing was also tested using two alternative self-healing techniques, i.e. expanded perlite (EP) concrete and direct introduction of bacteria in concrete. A bacterial solution was embedded in EP and calcium lactate pentahydrate was added as the nutrient. Experiments revealed that specimens containing EP-immobilized bacteria had the most effective crack-healing. After 28 days of healing, the values of completely healed crack widths were up to 0.78 mm, which is higher than the 0.5 mm value for specimens with the direct addition of bacteria. The specimen showed a significant self-healing phenomenon caused by substantial calcite precipitation by bacteria. The induced cracks were observed to be repaired autonomously by the calcite produced by the bacteria without any adverse effect on strength. The results of this research could provide a scientific foundation for the use of expanded perlite as a novel microbe carrier and Sporosarcina aquimarina as a potential microbe in bacteria-based self-healing concrete.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 5; art. no. e146475
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crack detection by the topological gradient method
    Autorzy:
    Amstutz, S.
    Horchani, I.
    Masmoudi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/970147.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    wykrywanie pęknięć
    wrażliwość topologiczna
    gradient topologiczny
    równanie Poissona
    crack detection
    topological sensitivity
    topological gradient
    Poisson equation
    Opis:
    The topological sensitivity analysis consists in studying the behavior of a shape functional when modifying the topology of the domain. In general, the perturbation under consideration is the creation of a small hole. In this paper, the topological asymptotic expansion is obtained for the Laplace equation with respect to the insertion of a short crack inside a plane domain. This result is illustrated by some numerical experiments in the context of crack detection.
    Źródło:
    Control and Cybernetics; 2005, 34, 1; 81-101
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    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
    Tytuł:
    Residual life estimation of structural beam using experimental and numerical modal analysis methods
    Autorzy:
    Siva, Gandam Anand
    Ramakrishna, Shinigam
    Powiązania:
    https://bibliotekanauki.pl/articles/1819188.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    structural beam
    residual life estimation
    FFT analyzer
    damage detection
    crack location
    natural frequencies
    belka strukturalna
    ocena trwałości resztkowej
    analiza FFT
    wykrywanie uszkodzeń
    lokalizacja pęknięć
    częstotliwości drgań własnych
    Opis:
    A structural beam is a common element in many mechanical structures such as ship propeller shaft, crane boom, and aircraft wings. In the present paper experimental and numerical modal analysis are carried out for estimating the damage, geometric location of the damage, severity of damage and residual life of structural beam to prevent unexpected failures of mechanical structures. Experimental and numerical modal analysis results for healthy and cracked beam are compared for validation of numerical methodology used in the present paper. Experimental modal analysis is performed on both healthy and cracked beam with the help of impact hammer, acceleration sensor and FFT (Fast Fourier Transformer) analyzer associated with EDM (Engineering Data Management) software. Modal tests are conducted using impact method on selected locations of the entire healthy and cracked beam to find the first three natural frequencies, which are used to detect the presence of damage and geometric location of the damage. Three parametric studies are carried out to know the effect of crack depth, crack location and crack orientation on the natural frequencies of the cracked beam. Finally, the residual life of a healthy and cracked beam was estimated using Basiquin’s equation and finite element analysis software called ANSYS 18.1.
    Źródło:
    Journal of Mechanical and Energy Engineering; 2020, 4, 2; 135--146
    2544-0780
    2544-1671
    Pojawia się w:
    Journal of Mechanical and Energy Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Examination and Detecting Discontinuities in the Austenite Inconel 625 Layer Used on the Sheet Pile Walls of the Boiler’s Evaporator to Utilize Waste Thermally
    Wymagania jakościowe stawiane powłoce austenitycznej Inconel 625 stosowanej na ścianach szczelnych parownika kotła do termicznej utylizacji odpadów
    Autorzy:
    Słania, J.
    Krawczyk, R.
    Wójcik, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/351569.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surfacing by welding
    surfacing layer
    incinerator
    wykrywanie pęknięć powierzchniowych
    warstwa napawania
    spalarnia odpadów
    Opis:
    There are practical aspects of a quality control of the Inconel 625 surfacing weld in terms of undergone examinations and detected defects in chapter three of the article. Visual inspections, examinations of the thickness of the surfacing weld, examinations of an iron content on the surface of the surfacing weld and detecting surface cracks are described. A process of undergone practical examinations is presented.
    W rozdziale trzecim przedstawiono praktyczne aspekty kontroli jakościowej napoiny Inconel 625 w ujęciu wykonywanych badań i wykrywanych niezgodności. Omówiono badania wizualne, badania grubości napoiny, badania zawartości żelaza na powierzchni napoiny oraz wykrywanie pęknięć powierzchniowych. Zaprezentowano przebieg praktycznie wykonywanych badań.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 3A; 1703-1709
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fatigue crack detection using diffused lamb wave field – damage index vs. crack length estimation
    Autorzy:
    Staszewski, Wiesław Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/128115.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    fatigue crack detection
    Lamb waves
    crack length estimation
    wykrywanie pęknięć zmęczeniowych
    fale Lamba
    szacowanie długości pęknięcia
    Opis:
    Fatigue crack detection is one of the major problems in maintenance of engineering structures. Ultrasonic guided waves are used for fatigue crack detection in metallic plate components. The application involves Lamb wave propagation and the analysis of the diffused wave field. The cross-correlation function is used to obtain a damage index that reveals the initiation of fatigue crack. The major focus of the paper is on crack length estimation. The results demonstrate that crack length estimation based on Lamb wave propagation is challenging but not impossible.
    Źródło:
    Vibrations in Physical Systems; 2019, 30, 2; 1-6
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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