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vol. 51, no. 4 (2003)
vol. 52, no. 1-2 (2004)
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vol. 52, no. 3 (2004)

Contents of issue 1-2, vol. 52

  1. S. Gawłowski, R.B. Pęcherski: Analysis of load-capacity at collapse of I-section thin-walled beam
  2. W. Gutkowski, J. Zawidzka, J. Zawidzki: Stress controlled shape optimization of 2D elastic structures
  3. Z. Kowalska: Vibro-impact motion of heavily loaded compact hard bodies
  4. J. Latalski: Laminate ply stacking sequence optimization with fibers orientation imperfections
  5. J. Pencik: Material nonlinear analysis of plane structures made of cement based composite materials using the ANSYS system
  6. A. Sawicki: Applied mechanics against the arts of geotechnical and coastal engineering
  7. R. Staroszczyk, B. Hedzielski: Creep buckling of a wedge-shaped floating ice plate

S. Gawłowski, R.B. Pęcherski: Analysis of load-capacity at collapse of I-section thin-walled beam
The aim of the paper is to analyse the load-capacity at collapse for thin-walled beams under the assumption of static approach. I-section beams subjected to torsion and bending with torsion are studied. The general formula for an interaction surface was derived. The comparison of the examples solved analytically with the finite element calculations and experimental results confirms the assumed hypotheses concerning statically admissible distribution of stresses in a plastic hinge. The analysis revealed also that normal stresses have a decisive influence on the value of load-carrying capacity in the case of thin-walled beams.

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W. Gutkowski, J. Zawidzka, J. Zawidzki: Stress controlled shape optimization of 2D elastic structures
A simple and effective method of stress-controlled shape optimization of 2D linear elastic structures is presented. The main elements of the method are: adaptive FE grids fitting well to the structure shape at each iteration step of the proposed simple optimization algorithm and the concept of stress level factor, controlling directly the design variables being the grid parameters. Several examples of beam-type and plate-type 2D structures are investigated. A few iterations only are needed in order to reach a nearly optimal solution.

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Z. Kowalska: Vibro-impact motion of heavily loaded compact hard bodies
In the paper, the particular problems of modelling and simulation of dynamic unilateral contact of compact hard bodies are considered. Special attention is given to the rolling contact of bodies with irregular rolling surfaces. Due to inertia of the bodies and large but finite contact stiffness, contact vibrations arise and transient contact discontinuities may occur. In the developed algorithms, Hertzian model of contact is used within the elastic range. Two different quasi-static models of contact are used whenever during simulation the dynamic contact force exceeds its limiting value for the first plastic flow. The modelling problems considered herein are related mainly to the wheel/rail normal contact in rail transport. On the basis of simulations, plastic deformations resulting from free excessive vertical oscillations are proposed as one of the possible causes of rail and wheel corrugations.

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J. Latalski: Laminate ply stacking sequence optimization with fibers orientation imperfections
The paper discusses the fiber orientations imperfections effect on the optimum design of a laminate plate exposed to compressive load. It is assumed that fibers angular imperfection for each design variable can not exceed maximum allowable deviation from variable's nominal value. These maximal accepted deviations are called tolerances. The incorporation of tolerances into the design algorithm is achieved by diminishing the limiting values of state variables by the product of assumed tolerances and appropriate sensitivities. Therefore, the given method allows to introduce tolerances into the design in a relatively simple way and ensures safe results. The paper is illustrated by examples of the rectangular laminate plate minimum thickness design. Numerical results show the reliability-based design to be important for structural safety compared to the approach where tolerances are not taken into account.

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J. Pencik: Material nonlinear analysis of plane structures made of cement based composite materials using the ANSYS system
At present, it is possible to carry out a structure analysis using various calculation systems based mainly on the Finite Element Method (FEM). These systems mostly include finite elements, which can be used for geometrical and material nonlinear analysis of civil-engineering structures. Most of these elements are derived and used especially for the analysis of steel structures. For the analysis of structures made of cement based composite materials are developed and special elements are used. The article describes the methods of analysis of structures made of cement based composite materials with respect to material non-linearity. The ANSYS analysis system is further described in the article and the beam element implemented in this system.
The beam element detailed derivation, including the presentation of material models that can be used for an analysis with this element is presented. Some numerical examples are shown at the end of the article.

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A. Sawicki: Applied mechanics against the arts of geotechnical and coastal engineering
This essay deals with interactions between applied mechanics and geotechnical and coastal engineering. Its aim is to answer some basic questions concerning the influence of applied mechanics on the above specializations and vice versa, as well as to identify practical problems which could be inspiring for applied mechanics. The above problems are discussed within the framework of soils' plasticity and mechanics of mixtures.

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R. Staroszczyk, B. Hedzielski: Creep buckling of a wedge-shaped floating ice plate
The paper is concerned with the problem of creep buckling of a floating ice plate pressing against a rigid, vertical-walled, engineering structure of a finite length. The plate is modelled as a truncated wedge of a semi-infinite length and constant thickness, resting on a liquid base and subjected to transverse bending due to the elastic reaction of the base and in-plane axial compression due to wind and water drag forces. The ice is treated as a viscous material, with the viscosity varying with the depth of the ice cover. The results of numerical calculations, carried out by the finite-element method, show the evolution of creep buckles in the plate, and also illustrate the behaviour of the ice cover at different levels of the in-plane axial loading, at different temperatures across the ice, and for different geometries of the wedge-shaped plate.

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