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    Tytuł:
    Predictions of fracture resistance of spruce wood under mixed mode loading using non-local fracture theory and numerical modelling
    Autorzy:
    Romanowicz, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2200902.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    mixed-mode bending test
    process zone length
    resistance curves
    fracture criteria
    cohesive zone model
    Opis:
    A novel analytical model to predict fracture resistance of a quasi-brittle material, like wood, is presented. The model is based on a scaling parameter introduced into the non-local fracture theory to take into account the specimen size effect on the development of the damage zone. An expression for length of the critical process zone, which can be used in damage tolerant design of wooden structures is derived from this theory. The model is validated with mixedmode bending tests. A numerical analysis using cohesive elements is performed to understand the role of specimen size in the development of the damage zone. The analytical predictions of the fracture resistance and the critical process zone length for wood are compared with numerical results and experimental data available in the literature.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2023, 61, 1; 147--162
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Static and dynamic debonding strength of bundled glass fibers
    Autorzy:
    Gunavan, F. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/139614.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cohesive zone model
    debonding
    finite element method
    FEM
    model strefy kohezyjnej
    odspajanie
    metoda elementów skończonych
    MES
    Opis:
    Experimental design and computational model for predicting debonding initiation and propagation are of interest of scientists and engineers. The design and model are expected to explain the phenomenon for a wide range of loading rates. In this work, a method to measure and quantify debonding strength at various loading rates is proposed. The method is experimentally verified using data obtained from a static test and a pulse-type dynamic test. The proposed method involves the cohesive zone model, which can uniquely be characterized with a few parameters. Since those parameters are difficult to be measured directly, indirect inference is deployed where the parameters are inferred by minimizing discrepancy of mechanical response of a numerical model and that of the experiments. The main finding suggests that the design is easy to be used for the debonding characterization and the numerical model can accurately predict the debonding for the both loading cases.The cohesive strength of the stress-wave case is significantly higher than that of the static case; meanwhile, the cohesive energy is twice larger.
    Źródło:
    Archive of Mechanical Engineering; 2018, LXV, 2; 209-220
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability and failure of thin-walled composite structures with a square cross-section
    Autorzy:
    Czajka, Błażej
    Różyło, Patryk
    Dębski, Hubert
    Powiązania:
    https://bibliotekanauki.pl/articles/2097437.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Promocji Wiedzy
    Tematy:
    finite element method
    FEM
    post-buckling
    progressive failure analysis
    PFA
    delamination
    cohesive zone model
    CZM
    Opis:
    This paper is devoted to the analysis of the stability and load-carrying capacity of thin-walled composite profiles in compression. The specimens reflect elements made of carbon fibre reinforced laminate (CFRP). Thin-walled columns with a square cross-section were made from 4 layers of composite in 3 different combinations of layer arrangements. Advanced numerical analyses have been carried out. In the first stage of the study, a buckling analysis of the structure was performed. In further numerical simulations, two advanced models were used simultaneously: the Progressive Failure Analysis (PFA) and the Cohesive Zone Model (CZM). The results showed significant differences between the critical load values for each layer configuration. The forms of buckling and the areas of damage initiation and evolution were also dependent on the applied layup.
    Źródło:
    Applied Computer Science; 2022, 18, 2; 43--55
    1895-3735
    Pojawia się w:
    Applied Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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