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    Wyświetlanie 1-7 z 7
    Tytuł:
    Ultrasound monitoring for evaluation of damage in reinforced concrete
    Autorzy:
    Rucka, M.
    Wilde, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/201306.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    concrete
    degradation
    microcracking
    non-destructive evaluation
    ultrasonic waves
    beton
    degradacja
    mikropęknięcia
    fale ultradźwiękowe
    Opis:
    The paper deals with automated monitoring of damage evolution in concrete elements subjected to three-point bending tests. The monitoring is based on the nonlinear interactions of traveling ultrasonic waves with micro-crack zones inside the concrete specimens and surface-breaking cracks. The developed procedure assumes semi-continuous ultrasonic testing during the element full loading cycle and generation of the power spectral density maps for the on-line assessment of the degradation process. Two damage indicators are introduced to evaluate micro- and macro-damage. The preliminary experimental results show that the proposed automated monitoring system provides an effective method for the evaluation of progressive damage in concrete.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 1; 65-75
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coating synthetic materials with zinc oxide nanoparticles acting as a UV filter
    Pokrywanie materiałów syntetycznych cząstkami nano-tlenku cynku pełniącymi funkcję filtru UV
    Autorzy:
    Woźniak, B.
    Dąbrowska, S.
    Wojnarowicz, J.
    Chudoba, T.
    Łojkowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/168967.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Ceramiki i Materiałów Budowlanych
    Tematy:
    nano zinc oxide
    UV filters
    polyethylene terephthalate (PET)
    ultrasounds
    nanotlenek cynku
    filtry UV
    politereftalan etylenu (PET)
    fale ultradźwiękowe
    Opis:
    Zinc oxide (ZnO) is one of physical filters that effectively absorb ultraviolet light in the UV-A range. ZnO produced at the Laboratory of Nanostructures was characterised by nanometric particle size of 28±4 nm (SSA BET). By coating the surface of a transparent film of polyethylene terephthalate (PET) with ZnO nanoparticles, the authors aimed at obtaining a coating that absorbs UV-A radiation. The coating process took place in a water suspension of ZnO, in which the phenomenon of acoustic cavitation was triggered, where the implosion of cavitation bubbles led to deposition of ZnO nanoparticles on the PET film surface. As part of the work, optimum parameters of the PET film coating process were developed, thus obtaining a filter in the form of a ZnO coating that effectively absorbs UV light.
    Tlenek cynku (ZnO) jest zaliczany do filtrów fizycznych skutecznie pochłaniających światło ultrafioletowe w zakresie UV-A. ZnO wytworzony w Laboratorium Nanostruktur charakteryzował się nanometryczną wielkością cząstek 28±4 nm (SSA BET). Pokrywając powierzchnię transparentnej folii z politereftalanu etylenu (PET) nanocząstkami ZnO autorzy mieli na celu uzyskanie warstwy pochłaniającej promieniowanie UV-A. Pokrywanie odbywało się w wodnej zawiesinie ZnO, w której wytworzono zjawisko kawitacji akustycznej, gdzie implozja pęcherzy kawitacyjnych prowadziła do osadzenia się nanocząstek ZnO na powierzchni folii PET. W ramach prac opracowano optymalne parametry procesu pokrywania folii PET uzyskując filtr w postaci warstwy ZnO, skutecznie pochłaniającej światło UV.
    Źródło:
    Szkło i Ceramika; 2017, R. 68, nr 3, 3; 15-17
    0039-8144
    Pojawia się w:
    Szkło i Ceramika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lamb wave-based monitoring of shear failure of an adhesive lap joint
    Monitorowanie zniszczenia ścinanego połączenia klejonego za pomocą fal Lamba
    Autorzy:
    Rucka, M.
    Wojtczak, E.
    Lachowicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/327588.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    adhesive joint
    tensile loading
    ultrasonic waves
    damage assessment
    structural health monitoring
    złącze klejone
    obciążenie rozciągające
    fale ultradźwiękowe
    ocena uszkodzeń
    monitoring techniczny
    Opis:
    The paper presents a study on the elastic wave propagation in adhesive joints of steel plates subjected to tensile loading. A single lap joint was chosen for analysis because of its simplicity and plurality of applications. Experimental investigations consisted of the uniaxial extension of prepared specimens. Force and displacement values were recorded by a testing machine. Simultaneously, guided Lamb waves were excited and signals of their propagation were collected in a number of points by piezoelectric transducers attached to the specimen surface. Further processing of signals allowed to determine some disturbances in gathered data. The continuous wavelet transform revealed discontinuities in force-displacement relations. The Fourier transform showed changes in frequency values of recorded signals. Large disturbances of the root mean square values were also observed. The results of all analyses allowed to conclude that the identification of partial degradation state before the sample destruction was possible.
    Artykuł przedstawia badania propagacji fal sprężystych w połączeniach klejonych płyt stalowych poddanych działaniu obciążenia rozciągającego. Pojedyncze złącze zakładkowe zostało wybrane do analizy ze względu na jego prostotę i mnogość zastosowań. Badania eksperymentalne polegały na jednoosiowym rozciąganiu przygotowanych próbek. Wartości siły i przemieszczenia były zapisywane przez maszynę wytrzymałościową. Jednocześnie, wzbudzano fale prowadzone Lamba, a sygnały ich propagacji rejestrowano w kilku punktach za pomocą czujników piezoelektrycznych przymocowanych do powierzchni próbki. Dalsza obróbka sygnałów pozwoliła na wykrycie pewnych zaburzeń w zebranych danych. Ciągła transformacja falkowa ukazała nieciągłości w zależnościach siła-przemieszczenie. Transformacja Fouriera pokazała zmiany w wartościach częstotliwości zarejestrowanych sygnałów. Zaobserwowano także duże skoki wartości średniej kwadratowej. Wyniki przeprowadzonych analiz pozwoliły na sformułowanie wniosku, iż identyfikacja stanu częściowej degradacji przed zniszczeniem próbek była możliwa.
    Źródło:
    Diagnostyka; 2018, 19, 4; 51-57
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Contactless ultrasonic method for determining knitted fabrics tension
    Autorzy:
    Zashchepkina, N. M.
    Zdorenko, V. G.
    Markin, M. O.
    Barilko, S. V.
    Shipko, D. O.
    Powiązania:
    https://bibliotekanauki.pl/articles/2172163.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    tension of textile fabric
    amplitude of ultrasonic waves
    contactless control
    through pores of the material
    interfibre porosity
    naprężenia
    tkanina tekstylna
    amplituda
    fale ultradźwiękowe
    sterowanie
    matariał porowaty
    porowatość włókna
    Opis:
    Purpose The values of the measured amplitudes of ultrasonic vibrations that have passed the controlled material have been obtained. These values were compared with the amplitude of the waves passing through the fabric sample when the initial tension was applied to it. After that, the total current value of the tension of each sample of the knitted fabric in its three zones was determined. The distribution of the total tension in different zones of the sample material was also determined. Design/methodology/approach It has been established that the amplitude of ultrasonic waves passing through different zones of the textile material can be used to determine the tension of the knitted fabric over the entire width of its fabric. Findings The possibility and expediency of determining the fabric tension on knitting equipment by using the ultrasonic contactless method has been shown. The tension of the knitted fabric in its manufacture is the main technological parameter, the value of which determines the physical, mechanical and consumer properties of the finished fabric, especially basis weight. The use of operational technological control of the tension of knitted fabrics directly during their production will improve the quality of finished products, and, accordingly, the reliability of use in personal protective equipment, in particular in body armour. It has been proposed to determine the tension of knitted fabrics in their production on knitting equipment by changing the amplitude of ultrasonic waves passing through the material under the action of tension, which also changes during the movement of the process equipment. The proposed contactless method is quite promising, since it has a number of significant advantages over the existing contact methods. In the course of the research, experimental measurements of the amplitude of ultrasonic waves have been carried out. These waves passed through samples of fabric of various materials while stretching. The samples of knitted fabrics were irradiated with an ultrasonic pulse signal with a wave frequency of 40 kHz. The samples of knitted fabrics from 58x2 Tex Kevlar threads and high molecular weight 44x3 Tex polyethylene yarns with double weave 1x1 elastic have been taken as a basis for the research. Research limitations/implications For textile fabrics, the structure of which does not allow stretching through pores under the action of tension, it is necessary to additionally adjust the contactless sensors in frequency and capacity depending on the corresponding sample. Practical implications The values of the measured amplitudes of ultrasonic vibrations that have passed the controlled material have been obtained. These values were compared with the amplitude of the waves passing through the fabric sample when the initial tension was applied to it. After that, the total current value of the tension of each sample of the knitted fabric in its three zones was determined. The distribution of the total tension in different zones of the sample material was also determined. Originality/value The dependences of the amplitude of ultrasonic waves, transmitted through the textile material in its different zones, on the value of the total tension, and on the value of the distribution of the tension of the fabric over its entire width were obtained. The deviations δP of the tension display between the determination of this parameter by the standard and ultrasonic methods are shown. The deviations δU between the amplitudes of waves passing through different zones of the controlled fabric are also determined.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2022, 112, 1; 13--24
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    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:
    Application of non-contact ultrasonic method in air to study fiber-cement corrugated boards
    Autorzy:
    Drelich, Radosław
    Rosiak, Michał
    Pakula, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/2128140.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Lamb waves
    cellulose fiber cement boards
    non-contact ultrasonic methods
    fale Lamba
    płyta celulozowo-cementowa
    metody ultradźwiękowe bezkontaktowe
    Opis:
    The fiber-cement and cellulose boards are materials commonly used in architectural engineering for exterior and interior applications such as building facades or as wall and roof covering materials. The aim of the study was to present the ultrasonic non-contact method of testing fiber-cement boards with Lamb waves and to discuss the results and limitations of the method in context of quality control of the material. The experiments were performed for the corrugated boards using a laboratory non-contact ultrasonic scanner. Lamb waves were generated in the tested materials by a transmitter excited by a chirp signal with a linearly modulated frequency. Waves transmitted through the tested material are acquired by the receiver and registered by the PC based acquisition system. The tests were done on reference plate board and the corrugated boards. As the main descriptor to assess the quality of tested boards the maximum amplitude of transmitted Lamb waves was selected. The significant role of boundary effects and frequency of waves was noticed. The obtained results have confirmed the usefulness of the applied ultrasonic method for testing macroscopic inhomogeneity of corrugated fiber-cement boards.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; e136740, 1--9
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of non-contact ultrasonic method in air to study fiber-cement corrugated boards
    Autorzy:
    Drelich, Radosław
    Rosiak, Michał
    Pakula, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/2173608.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Lamb waves
    cellulose fiber cement boards
    non-contact ultrasonic methods
    fale Lamba
    płyta celulozowo-cementowa
    metody ultradźwiękowe bezkontaktowe
    Opis:
    The fiber-cement and cellulose boards are materials commonly used in architectural engineering for exterior and interior applications such as building facades or as wall and roof covering materials. The aim of the study was to present the ultrasonic non-contact method of testing fiber-cement boards with Lamb waves and to discuss the results and limitations of the method in context of quality control of the material. The experiments were performed for the corrugated boards using a laboratory non-contact ultrasonic scanner. Lamb waves were generated in the tested materials by a transmitter excited by a chirp signal with a linearly modulated frequency. Waves transmitted through the tested material are acquired by the receiver and registered by the PC based acquisition system. The tests were done on reference plate board and the corrugated boards. As the main descriptor to assess the quality of tested boards the maximum amplitude of transmitted Lamb waves was selected. The significant role of boundary effects and frequency of waves was noticed. The obtained results have confirmed the usefulness of the applied ultrasonic method for testing macroscopic inhomogeneity of corrugated fiber-cement boards.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; art. no. e136740
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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