Wydział Mechaniczny / Faculty of Mechanical Engineering / W1

Stały URI zbioruhttp://hdl.handle.net/11652/1

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1997 - 199922010 - 20161

Ustawienia

Autorsearch.filters.applied.operator.equals: search.filters.author.Kołakowski, ZbigniewTematsearch.filters.applied.operator.equals: search.filters.subject.thin-walled columns

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Teraz wyświetlane 1 - 3 z 3
  • Pozycja
    Nośność graniczna cienkościennych słupów z centralnymi żebrami pośrednimi w ramach drugiego rzędu nieliniowego przybliżenia
    (Wydawnictwo Politechniki Łódzkiej, 1997) Kołakowski, Zbigniew; Teter, A.
    W pracy przeanalizowano interakcyjne wyboczenie cienkościennych słupów wzmocnionych żebrami pośrednimi. Żebra modelowano płytami. Przyjęto, że słupy są swobodnie podparte na obu końcach. Zastosowano drugi rząd nieliniowego przybliżenia asymptotycznej metody Byskowa i Hutchinsona [1] wykorzystując w obliczeniach numerycznych metodę macierzy przejścia. Analizę przeprowadzono dla różnych parametrów geometrycznych.
  • Pozycja
    Global and local instability of thin-walled columns beyond the proportional limit
    (Wydawnictwo Politechniki Łódzkiej, 1997) Kołakowski, Zbigniew; Kowal-Michalska, Katarzyna
    The problem of global and local stability in the inelastic range for thin-walled columns is examined on the basis of the defonnation theory and the incremental theory of plasticity. Columns of closed and open cross-sections built from rectangular isotropic plates are subjected to the loading changing from unifonn compression to pure bending. A solution of elastic buckling for a thin-walled orthotropic columns based on Koiter's asymptotic method is employed to investigate the elasto-plastic buckling mode of the colunm and to detennine the critical load. The study is based on the numerical method of the transition matrix. The results of numerical calculations are presented in diagrams
  • Pozycja
    Local Buckling of Thin-Walled Column of Square Cross-Section Made of In-Plane Coupled Laminate.
    (Lodz University of Technology. Faculty of Mechanical Engineering. Department Division of Dynamics., 2016) Kołakowski, Zbigniew; Teter, Andrzej; Pasierbiewicz, Damian
    The non–symmetric, general laminate exhibits different types of coupling between the extension, shearing, bending and twisting. For practical reasons, the in–plane coupled laminate is a particularly interesting. In this case, the coupling between shearing andextension takes place. Details calculations were performed for a short columns of square cross-section made of in–plane coupled and fully uncoupled laminate under uniform compression. Finite element method (FEM) and analytical–numerical method (ANM) were performed. In FEM analyses, the eigenbuckling problem has been solved using the Lanczos method, whereas the nonlinear buckling analysis were performed using the Newton– Raphson method and the Ritz method. In ANM analyses, the Koiter’s asymptotic theory is applied. The relationship between forces/moments and deformations/curvature were described using classical lamination theory (CLT). The coupling between in–plane shearing and extension has a significant influence on the behavior of thin–walled structures under compression.