Temat: isotropic damage - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Gradient damage with volumetric-deviatoric decomposition and one strain measure
Gradientowy model mechaniki uszkodzeń z aksjatorowo-dewiatorową dekompozycją i jedną miarą odkształcenia
Autorzy:: Wosatko, A.
Powiązania:: https://bibliotekanauki.pl/articles/973165.pdf
Data publikacji:: 2011
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: izotropowy model mechaniki uszkodzeń
model gradientowy
metoda elementów skończonych
isotropic damage
gradient enhancement
finite element method
Opis:: The paper presents a two-field formulation of the gradient-enhanced damage model and its application. This isotropic model is characterized by two damage parameters with a volumetric-deviatoric decomposition. However, one strain measure governs the development of damage as for the scalar description. The theory is verified by means of one-element benchmarks and also a more sophisticated simulation, namely the splitting of concrete cylinder in the Brazilian test is discussed.
Artykuł przedstawia dwupolowe sformułowanie gradientowego modelu mechaniki uszkodzeń i jego zastosowanie. Ten izotropowy model charakteryzują dwa parametry uszkodzenia z podziałem aksjatorowo-dewiatorowym. Jednakże jedna miara odkształcenia decyduje o rozwoju uszkodzenia jak w opisie skalarnym. Teoria jest zweryfikowana za pomocą testów jednoelementowych, a także bardziej zaawansowanej symulacji rozłupywania betonowego cylindra w tzw. teście brazylijskim.
Źródło:: Mechanics and Control; 2011, 30, 4; 254-263
2083-6759
2300-7079
Pojawia się w:: Mechanics and Control
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Isotropic damage in viscoplastic flow conditions, FEM applications with practical examples
Autorzy:: Kłosowski, P.
Pyrzowski, Ł.
Powiązania:: https://bibliotekanauki.pl/articles/243317.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: FEM
viscoplacticity
isotropic damage
constitutive modelling
numerical modelling
Opis:: The damage mechanics is a very important branch of solid mechanics. Although it is still developing, it has already been applied to many engineering problems. Among many various types of damage models, which are commonly used, the main subject of this paper is the isotropic continuous damage in viscoplastic flow conditions. This paper include Information about the viscoplastic type of constitutive modelling, the presentation of mechanical representation of damage by the scalar variable D, effective stress concept, equations of the chosen isotropic damage model, the Chaboche viscoplastic constitutive model including damage effects and the identification procedure of damage material parameters with practical example. The chosen constitutive model is easy to apply to the finite element analysis. Using the MSC.Marc system, which great advantage is possibility ofa user subroutine application, the geometry nonlinear finite element analysis of plate and shell structures including damage is possible. This paper includes description of the applied program and user subroutines applied: UVSCPL - viscoplastic modelling (the standard MSC.Marc system supports the Chaboche model, but not in the damage variant) and UACTIV - deactivation of finite elements. The last part of the paper includes the practical numerical example of a clamped bar of 0.3 m long and 0.1x0.01 m cross-section size. In calculations the four-node thin-shell, divided into five layers, elements were used. dynamic, geometrically nonlinear analysis using Newmark integration algorithm has been performed. As the results, screen shots of displacements with maps of damage parameter for the bar infour time moments are presented.
Źródło:: Journal of KONES; 2008, 15, 1; 127-136
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: A nonlinear statistical empirical model for transversely isotropic rocks under uniaxial compression condition
Autorzy:: Deng, Yansheng
Shen, Chenjie
Zou, Baoping
Powiązania:: https://bibliotekanauki.pl/articles/2173991.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: skała izotropowa poprzecznie
uszkodzenie statyczne
kompresja jednoosiowa
transversely isotropic rock
statics damage
uniaxial compression
Opis:: The mechanical characteristics of transversely isotropic rocks are significantly different under various levels of inclination, and it is difficult to describe exactly the mechanical behaviour of transversely isotropic rocks. Assuming that rock consists of a great deal of microelements, and the microelement strength controlled by Mohr-Coulomb criterion follows the log normal distribution. The elastic modulus is used to reflect the anisotropy of rock, and the weak patches stiffness model is verified and employed to depict the variation of elastic modulus with different inclination angle. Based on basic damage mechanics theory and statistical method, a nonlinear statistical empirical model for transversely isotropic rocks is proposed under uniaxial compressive condition. In order to verify the correctness of the proposed model, comparison analyses between predicted results and experimental data taken from published literature are carried out, which have good consistency. Finally, the discussions on the influences of the distribution parameters α, c and elastic modulus with different inclination angle, Eθ, on proposed model is offered.
Źródło:: Archives of Civil Engineering; 2022, 68, 3; 37--47
1230-2945
Pojawia się w:: Archives of Civil Engineering
Dostawca treści:: Biblioteka Nauki

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