ENGINEERING TRANSACTIONS
ROZPRAWY INŻYNIERSKIE
A QUARTERLY JOURNAL
- S. Ochelski, R. Gieleta, A. Kiczko: Investigations of Fatigue Strength of Sandwich Plates
- Ł. Figiel, M. Kamiński: Numerical analysis of the damage evolution in a composite pipe
joint under cyclic static axial~tension
- R. Adamczyk, T. Łodygowski: Numerical Modeling of Laboratory Test of Plain Concrete Under
Uniaxial Impact Compression
- B. Sapiński:
Dynamic characteristics of an experimental mr fluid damper
- W. Szczepiński: On the movement of granular materials in bins and hoppers Part I. Two-dimensional problems.
- W. Szczepiński: On the movement of granular materials in bins Part II: Three-dimensional problems
- R. Grądzki, K. Kowal-Michalska: Stability and ultimate load of three-layered plates -- a parametric study
- Z. Mróz, I. Sielamowicz: Deformation zones in granular materials in hoppers during filling and emptying processes
- S. Ochelski, R. Gieleta, A. Kiczko: Investigations of Fatigue Strength of Sandwich Plates
- The results of investigations of mechanical properties of the
polyvinyl chloride foam and the epoxide composite reinforced by
glass clothes and their fatigue life are presented. The fatigue
life and the dependence of the structure degradation on the number
of cycles of the sandwich plate subject to bending are also given.
The plate was composed with the core made of the polyvinyl
chloride foam and the face sheets of the epoxide composite
reinforced by glass clothes.
Contents
- Ł. Figiel, M. Kamiński: Numerical analysis of the damage evolution in a composite pipe
joint under cyclic static axial tension
- The main goal of this paper is to present a computational analysis
of damage evolution in adhesive joint connecting composite pipes
subjected to cyclic static axial tension with constant amplitude.
The approach uses the simplified average shear stress criterion
for defect propagation in the adhesive layer and applies the
continuum damage mechanics concept to continuum crack-like damage
representation in terms of the finite element stiffness. Numerical
studies are performed using the commercial Finite Element Method
displacement-based ANSYS program, with its special purpose finite
element containing birth and death option. Computed damage
evolution per a loading cycle leads further to estimation of the
cumulative damage growth in terms of a crack-like type for
different load amplitude levels. Finally, a numerically determined
relation between the applied load amplitude and the load cycles
number to failure is derived.
Contents
- R. Adamczyk, T. Łodygowski: Numerical Modeling of Laboratory Test of Plain Concrete Under
Uniaxial Impact Compression
- The aim of this study is to compare experimental results of the
behavior of concrete specimen, dynamically loaded in compression,
carried out by P.H. Bischoff and S.H. Perry
[8], with the results obtained in numerical simulation. The
intention of the investigation, reported in this paper, is to
create the constitutive relation for concrete that depends on
impact rates. The specimen was loaded in static as well as in
dynamic tests. New constitutive relation of concrete dependent on
impact rate has been proposed. Accuracy of the model was studied
and compared with the experiment in simple σ - ε characteristics. Two cases of concrete strength 30 and 50 MPa and
three initial impact rates were considered. After verification in
a simple uniaxial test, the new constitutive relation has been
applied in complex engineering problem. Numerical impact analysis
was carried out for impact tests in the environment of the
ABAQUS/Explicit finite element code, and ABAQUS/Standard for
static tests [1].
Contents
- B. Sapiński: Dynamic characteristics of an experimental mr fluid damper
- The paper provides the results of experimental studies of dynamic
characteristics of a linear MRF damper, designed specially for
research purposes. Two MR fluids having different viscosity were
used in the experiments. Damper design and parameters of the
applied MR fluids are discussed. The relationship between the
damping force and piston velocity was determined and utilised to
identify the involution model of the damper. Currents in the coil
were measured for voltage excitations with pulse width modulation
and parameters of equivalent model of the control system were
identified.
Contents
- W. Szczepiński: On the movement of granular materials in bins and hoppers Part I. Two-dimensional problems.
- A simple numerical procedure for determining the field of
displacements of granular media in bins and hoppers is proposed.
The procedure is based on the concept of Jerzy Litwiniszyn, who
treated the gravity flow of granular media as a stochastic
process. He and his co-workers presented analytical solutions to a
certain number of simple problems concerning deformations of
terrain caused by underground mining operations. The numerical
procedure proposed in this paper is much more effective in solving
numerous problems of practical significance.
Contents
- W. Szczepiński: On the movement of granular materials in bins Part II: Three-dimensional problems
- A simple numerical procedure for determining three-dimensional
displacements of granular media in bins is proposed. In the
previous paper [6] such a numerical procedure was limited to the
two-dimensional analysis only. The proposed procedure is based on
the concept published by Professor Jerzy Litwiniszyn, who treated
the gravity flow of granular media as a stochastic process.
Contents
- R. Grądzki, K. Kowal-Michalska: Stability and ultimate load of three-layered plates -- a parametric study
- This work deals with the analysis of influence of some geometrical
and material parameters of layers on the mass, critical stress and
ultimate load of three-layered plates. The plates are built of
metal outer layers and a composite core. To obtain the maximum
load value, the analysis is carried out in the elasto-plastic
range basing on the Tsai-Wu criterion and Prandtl-Reuss equations.
The solution is obtained by an analytical-numerical method.
Contents
- Z. Mróz, I. Sielamowicz: Deformation zones in granular materials in hoppers during filling and emptying processes
- The present paper is concerned with the simplified analysis of
deformation and stress states in converging hoppers during filling
and discharge of a granular material. The equilibrium conditions
and stress-strain relations are satisfied for cylindrical slice
elements assuming dependence of displacement and stress on radial
coordinate. The elastic or elasto-plastic material model is used
with the Coulomb yield condition and non-associated flow rule. The
paper presents a detailed analysis of pressure evolution of a
granular material on a hopper wall during the emptying process
when the initial active state of pressure is transformed into the
passive state. The growth of wall pressure associated with this
process is demonstrated. The analytical treatment presented in
this paper can be compared with the respective finite element
solution.
Contents
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