ENGINEERING TRANSACTIONS
ROZPRAWY INŻYNIERSKIE
A QUARTERLY JOURNAL
- W. Osipiuk, K. Łukaszewicz:
Strain hardening under non-proportional loading in polycrystalline aluminum alloys
- M.M. Abdelkhalek:
Heat and mass transfer in MHD flow by natural convection from a permeable surface with heat generation effects
- M.S. Węglowski, Y. Huang, Y. M. Zhang:
An investigation of metal transfer process in GMAW
- A. Zbiciak:
Constitutive modelling and numerical simulation of dynamic behaviour of asphalt-concrete pavement
- Z.S. Olesiak:
Włodzimierz Stanisław Trzywdar Burzyński
- R.B. Pęcherski:
Burzyński yield condition vis-a-vis the related studies reported in the literature
- W. Osipiuk, K. Łukaszewicz:
Strain hardening under non-proportional loading in polycrystalline aluminum alloys
- In the paper it is postulated that the so-called common slip domains influence the character
of the strain hardening phenomena for complex loading paths. The slip domains were evaluated
on the basis of the Batdorf-Budiansky slip theory of plasticity. Evolution of a yield surface
for different non-proportional tension-torsion loading paths was determined for PA4 aluminum
alloy and the hypothesis that the strain hardening depends on the development of the common
slip domains was shown to be justified.
Contents
- M.M. Abdelkhalek:
Heat and mass transfer in MHD flow by natural convection from a permeable surface with heat generation effects
- The objectives of the present study are to investigate steady two-dimensional laminar flow
of a viscous incompressible, electrically conducting and heat-generating fluid, driven by a continuously moving porous plate immersed in a fluid-saturated porous medium, in the presence of
a transverse magnetic field. A uniform magnetic field acts perpendicularly to the porous surface
which absorbs fluid with a suction velocity. The non-linear partial differential equations governing the problem under consideration have been transformed by a similarity transformation
into a system of ordinary differential equations, which is solved numerically by applying a perturbation technique. The effects of material parameters on the velocity and temperature fields
across the boundary layer are investigated [28, 29]. A parametric study of all the governing
parameters is carried out and representative results are illustrated to reveal a typical tendency
of the solutions. Representative results are presented for the velocity temperature distributions
as well as the local friction coefficient and the local Nusselt number. Favorable comparisons
with the previously published work confirm the correctness of the numerical results.
Contents
- M.S. Węglowski, Y. Huang, Y. M. Zhang:
An investigation of metal transfer process in GMAW
- This paper presents the studies of the metal transfer process in gas metal arc welding with
mild steel electrode. It aims at mathematic description of the droplet flight trajectory, droplet
velocity and acceleration. To this end, the droplet flight trajectory was first fitted using the 3rd
order polynomial regression and it was found that the model can be reduced to the 2nd order.
The average diameter of a droplet, transfer rate of droplets, average velocity and acceleration
of a droplet were calculated. The geometric shape factor was estimated. A new metal transfer
monitoring method which is based on narrow band filter and does not require He-Ne laser, has
been used in this study to observe the metal transfer process.
Contents
- A. Zbiciak:
Constitutive modelling and numerical simulation of dynamic behaviour of asphalt-concrete pavement
- The main objective of the paper is to present a simple constitutive model suited for dynamic simulation of asphalt-concrete mixtures. ABAQUS/Explicit FE software is used for this
purpose. The model belongs to the class of overstress hypoelastic-viscoplastic materials, taking
into account the effect of pressure-dependence on yielding. The implementation of constitutive
relations formulated in the paper is done through user subroutine module VUMAT. The results
of numerical simulation of dynamic behaviour of multilayer pavement structure, illustrating
the applicability of the algorithm, is also discussed.
Contents
- Z.S. Olesiak:
Włodzimierz Stanisław Trzywdar Burzyński
-
Contents
- R.B. Pęcherski:
Burzyński yield condition vis-a-vis the related studies reported in the literature
- The paper is written in accompaniment of the publication of English translation of
W. Burzyński's paper [1], which deals with the yield criterion for materials revealing the
sensitivity of yield strength to pressure derived by W. Burzyński during preparation of his
doctor thesis in 1927 [2]. More recently the dependence of yield strength on pressure is related
to the so-called strength differential (SD) effect, i.e. asymmetry of elastic range, cf. e.g. [3, 4].
Therefore, the original Burzyński's formulation of yield condition remains actual and acquires
increasing significance. The position of Burzyński's energy-based approach in the literature is
reported and his main achievement in this field concerning the recent studies is discussed.
Contents
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