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Wyszukujesz frazę "damping behavior" wg kryterium: Temat

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    Wyświetlanie 1-3 z 3
    Tytuł:
    The Influence of Grain Size on the Mechanical Damping Behavior of Aluminum
    Autorzy:
    Jang, Haneul
    Choi, Kwangmin
    Shin, Jaehyuck
    Bae, Donghyun
    Choi, Hyunjoo
    Powiązania:
    https://bibliotekanauki.pl/articles/352557.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al
    tensile properties
    damping behavior
    grain size
    Opis:
    An understanding of the fundamental correlation between grain size and material damping is crucial for the successful development of structural components offering high strength and good mechanical energy absorption. With this regard, we fabricated aluminum sheets with grain sizes ranging from tens of microns down to 60 nm and investigated their tensile properties and mechanical damping behavior. An obvious transition of the damping mechanism was observed at nanoscale grain sizes, and the underlying causes by grain boundaries were interpreted.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 2; 475-479
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selfsimilar profiles in large time asymptotics of solutions to damped wave equations
    Autorzy:
    Karch, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/1205809.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    generalized wave equation with damping
    the Cauchy problem
    large time behavior of solutions
    selfsimilar solutions
    Opis:
    Large time behavior of solutions to the generalized damped wave equation $u_{tt} +A u_t +ν B u+F(x,t,u,u_t,∇ u) = 0$ for $(x,t)∈ ℝ^n × [0,∞)$ is studied. First, we consider the linear nonhomogeneous equation, i.e. with F = F(x,t) independent of u. We impose conditions on the operators A and B, on F, as well as on the initial data which lead to the selfsimilar large time asymptotics of solutions. Next, this abstract result is applied to the equation where $Au_t = u_t$, $Bu = -Δu$, and the nonlinear term is either $|u_t|^{q-1}u_t$ or $|u|^{α-1}u$. In this case, the asymptotic profile of solutions is given by a multiple of the Gauss-Weierstrass kernel. Our method of proof does not require the smallness assumption on the initial conditions.
    Źródło:
    Studia Mathematica; 2000, 143, 2; 175-197
    0039-3223
    Pojawia się w:
    Studia Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance Assessment of Steel Moment Connections Retrofitted With Various Reduced Section Patterns
    Autorzy:
    Sivandi-Pour, Abbas
    Powiązania:
    https://bibliotekanauki.pl/articles/396627.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    steel connector
    performance assessment
    load-bearing systems
    reduced beam section
    energy damping
    cyclic behavior
    nonlinear analysis
    złącze stalowe
    wzmocnienia
    system nośny
    analiza nieliniowa
    Opis:
    It is of high importance in seismic retrofitting of lateral load-bearing systems to increase the connections performance. The crucial point in the steel frame retrofitting process is to create plastic hinges in these types of frames. The formation of plastic hinges in beams and near columns generates large strains on column flanges as well as welding metal and heated surroundings, which can lead to brittle failure. The connection should be designed in such a way as to allow plastic hinge formation at certain points of the beam. One such method suggested for retrofit connections is to reduce the beam section locally away from the connection zone. There are various patterns available to locally reduce the beam section, such as circular, elliptical, and symmetric/asymmetric. In recent years, different proposals have been presented to design these connections which vary from older instructions. For this study, radiused cuts in the flange and slotted holes in the web of connection beams were selected for retrofitting analysis. Cyclic behavior, energy damping levels, and ductility of these connections were studied and compared before and after the retrofit by using nonlinear dynamic analysis. The results showed that the symmetrical circular hole pattern in the beam flanges demonstrated reliable performance.
    Źródło:
    Civil and Environmental Engineering Reports; 2019, 29, 4; 1-17
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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