ENGINEERING TRANSACTIONS
ROZPRAWY INŻYNIERSKIE
A QUARTERLY JOURNAL
- S. Gawłowski, R.B. Pęcherski:
Analysis of load-capacity at collapse of I-section thin-walled beam
- W. Gutkowski, J. Zawidzka, J. Zawidzki:
Stress controlled shape optimization of 2D elastic structures
- Z. Kowalska:
Vibro-impact motion of heavily loaded compact hard bodies
- J. Latalski:
Laminate ply stacking sequence optimization with fibers orientation imperfections
- J. Pencik:
Material nonlinear analysis of plane structures made of cement based composite materials using the ANSYS system
- A. Sawicki:
Applied mechanics against the arts of geotechnical and coastal engineering
- 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.
Contents
- 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.
Contents
- 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.
Contents
- 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.
Contents
- 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.
Contents
- 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.
Contents
- 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.
Contents
Reprints of the full papers may be obtained from their authors.
Contact Editorial Office in case you need
the address of the respective author.
Previous issue
