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Browsing Artykuły (WM) by Issue Date

Browsing Artykuły (WM) by Issue Date

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  • Lefik, Marek (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2004)
    An application of Artificial Neural Networks for a definition of the effective constitutive law for a composite is described in the paper. First, a classical homogenisation procedure is directly interpreted with a use of ...
  • Michalak, Bohdan (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2004)
    This contribution deals with stability of certain composite plates with a deterministic material structure which is not periodic but can be approximately regarded as periodic in small regions of a plate. The formulation ...
  • Chudzik, Agnieszka; Świniarski, Jacek (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2004)
    One of the most important elements of heat exchangers are perforated bottoms. These are perforated plates of significant thickness, in which heating cartridge pipes are mounted. For the designers of heat exchangers, the ...
  • Lipa, Sebastian; Kotełko, Maria (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2004)
    In the paper, the problem of collapse load and energy dissipation capacity of tubular multi-member energy absorbers subject to lateral crushing load is presented. The method of analytical solution of the problem of initial ...
  • Rogowski, Bogdan (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2004)
    This paper is concerned with an orthotropic thin plate containing a crack perpendicular to its surfaces. It is assumed that the transient thermal stress is set up by the application of a heat flux as a function of time and ...
  • Jędrysiak, Jarosław (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2004)
    Some problems of a dynamical stability of thin periodic plates are considered. As a tool to derive the governing equations of an averaged non-asymptotic plate model the tolerance averaging is applied, proposed for periodic ...
  • Szumiński, Przemysław; Kapitaniak, Tomasz; Stefański, Andrzej (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2004)
    An energy method for the position stability analysis of critical points (equilibrium positions) of dynamical systems with an arbitrary finite number of degrees of freedom is presented. The method proposed consists in the ...
  • Dyka, Ewa; Rogowski, Bogdan (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2005)
    The problem of electroelasticity for piezoelectric materials is considered. For axially symmetric states, three potentials are introduced, which determine displacements, electric potential, stresses, components of the ...
  • Jędrysiak, Jarosław; Michalak, Bohdan (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2005)
    The aim of the paper is to show certain justification of the new non-asymptotic model of thin periodic plates, derived using the tolerance averaging (Wo?niak and Wierzbicki, 2000). The model describes the effect of periodicity ...
  • Tomczyk, Barbara (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2005)
    The aim of this contribution is to propose a new averaged nonasymptotic model of stationary stability problems for thin linear-elastic cylindrical shells reinforced by stiffeners which are periodically, densely spaced along ...
  • Kubiak, Tomasz (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2006)
    An analysis of local buckling of thin-walled beam-columns, taking account global precritical bending within the first order approximation, is presented in the paper. The problem of interactive buckling of the structure is ...
  • Gawin, Dariusz; Pesavento, Francesco; Schrefler, Bernhard A. (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2006)
    In this paper, the authors present a mathematical description of a multi-phase model of concrete based on the second law of thermodynamics. Exploitation of this law allowed researchers to obtain definitions and constitutive ...
  • Awrejcewicz, Jan; Olejnik, Paweł (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2007)
    A self-excited system wit h unilateral friction contact modelled by a two degrees-of-freedom mechanical system, where the normaI farce varies during displacement of a block has been studied. The constructed real laboratory ...
  • Mrozowski, Jerzy; Awrejcewicz, Jan; Bamberski, Piotr (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2007)
    Analysis of the gait stability of a man moving along an even surface with a constant velocity is presented. The stability criteria applied to biped robots, namely: the Zero Moment Point (ZMP) and the Ground projection of ...
  • Jędrysiak, Jarosław; Radzikowska, Alina (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2007)
    Heat conduction in a thick layer made of non-periodically distributed micro-laminas of two rigid conductors is considered. Macroscopic properties of the layer are continuously graded across its thickness (FGL layer). The ...
  • Kozanecka, Dorota; Kozanecki, Zbigniew; Lech, Tomasz; Kaczmarek, Andrzej (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2007)
    A magnetic bearing system of a rotating shaft is characterized by a unique feature that consists in the possibility of monitoring static and dynamic loads (reactions) of each bearing under normaI operation of the machine. ...
  • Andrianov, Igor V.; Awrejcewicz, Jan; Kirichek, Yurii A.; Koblik, Steve G. (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2007)
    A contact problem for an elastic half-plane and an embedded rigid punch is studied. The employed mathematical model describes the behavior of a soil with embedded foundation. The analytical solution geverning the stress ...
  • Awrejcewicz, Jan; Łuczak, Bartosz (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2007)
    In the paper, finite element analysis of the rib cage model is applied to recognize stress distributions and to determine the rate of bone fractures (especially for pathologically changed bones). Two thorax models are ...
  • Awrejcewicz, Jan; Kudra, Grzegorz (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2007)
    A model of a flat triple pendulum with obstacles imposed on its position is used for the modelling of a piston-connecting rod-cranks haft system of a mono-cylinder four-stroke combustion engine. The introduced self-excited ...
  • Pawłowski, Witold; Oryński, Franciszek (Stowarzyszenie Inżynierów i Techników Mechaników Polskich, 2008)
    Przedstawiono problem modelowania procesu szlifowania z uwzględnieniem samowzbudnych drgań karbujących. Opisano metody jego modelowania oraz przegląd światowych dokonań w tym zakresie. Analizę przeprowadzono w celu określenia ...

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