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    Wyświetlanie 1-3 z 3
    Tytuł:
    Active Thermography in Qualitative Evaluation of Protective Materials
    Autorzy:
    Gralewicz, G.
    Więcek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/90338.pdf
    Data publikacji:
    2009
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    protective material
    active thermography
    defects
    Opis:
    This is a study of the possibilities of a qualitative evaluation of protective materials with active thermography. It presents a simulation of a periodic excitation of a multilayer composite material. Tests were conducted with lock-in thermography on Kevlar® composite consisting of 16 layers of Kevlar® fabric reinforced with formaldehyde resin with implanted delamination defects. Lock-in thermography is a versatile tool for nondestructive evaluation. It is a fast, remote and nondestructive procedure. Hence, it was used to detect delaminations in the composite structure of materials used in the production of components designed for personal protection. This method directly contributes to an improvement in safety.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2009, 15, 4; 363-371
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Możliwości wykorzystania termografii aktywnej do lokalizacji zbrojenia w elementach żelbetowych
    Possibilities of using active ir thermography for localization of steel bars in reinforced concrete
    Autorzy:
    Noszczyk, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/134750.pdf
    Data publikacji:
    2016
    Wydawca:
    ADVSEO
    Tematy:
    active thermography
    non-destructive testing
    material inclusions
    detection of rebar
    Opis:
    The paper presents the possibility of using non-destructive testing with active thermography to the location of reinforcement in concrete elements. Four reinforced concrete elements in the form of beams with dimensions of 24 x 24 x 200 cm was researched. The beams had the main reinforcement with diameters sequentially: 12 mm, 16 mm, 20 mm and 25 mm. Stirrups with a diameter of 6 mm were placed every 20 cm. Lagging for the main reinforcement of test surface was 26 mm. Reinforced concrete elements were heated with an infrared lamp and thermal images were recorded periodically at intervals of 1 min. Preliminary studies have shown that detection of reinforcement in concrete elements using active thermography is possible. The rebar was visible on the thermograms from the start of the cool down phase for about 20 min after. The study contains a description of the test stand, and the tests performed. The paper also highlighted the problems encountered on the implementation of research and prospect of development active thermography as a non-destructive testing.
    Źródło:
    Technical Issues; 2016, 2; 39-44
    2392-3954
    Pojawia się w:
    Technical Issues
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detection of thinning of homogeneous material using active thermography and classification trees
    Autorzy:
    Dudzik, Sebastian
    Dudek, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/1848987.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    active thermography
    classification tree
    defect detection and characterization
    material thinning detection
    Opis:
    Active thermography is an efficient tool for defect detection and characterization as it does not change the properties of tested materials. The detection and characterization process involves heating a sample and then analysing the thermal response. In this paper, a long heating pulse was used on samples with a low thermal diffusivity and artificially created holes of various depths. As a result of the experiments, heating and cooling curves were obtained. These curves, which describe local characteristics of the material, are recognized using a classification tree and divided into categories depending on the material thickness (hole depths). Two advantages of the proposed use of classification trees are: an in-built mechanism for feature selection and a strong reduction in the dimensions of the pattern. Based on the experimental study, it can be concluded that classification trees are a useful tool for the thinning detection of homogeneous material.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 1; 89-105
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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