ENGINEERING TRANSACTIONS
ROZPRAWY IN¯YNIERSKIE
A QUARTERLY JOURNAL
- K.N. Dey, S.Poria, H.P. Mazumdar:
On the peristaltic transport of a micropolar fluid
- W. Bodaszewski:
Algorithms of the method of statically admissible discontinuous stress fields (SADSF)
Part III. Software implementation and example problems formulated for fields around nodes
- G. Skorulski:
Experimental modelling of the influence of boundary conditions on kinematics
of the extrusion process
- P.K. Sharma, R.C. Chaudhary:
Flow through porous media induced by an impervious rotating disk in the presence
of magnetic field
- M.R. Khoshravan, M. Monir Vaghefi:
Numerical evaluation of delamination on mode II in glass fiber reinforced
composites
- K.Ch. Wierzcholski:
Comparison between impulsive and periodic non-Newtonian lubrication
of human hip joint
- K.N. Dey, S.Poria, H.P. Mazumdar:
On the peristaltic transport of a micropolar fluid
- In this paper, we study some characteristics of the peristaltic
motion of an incompressible micropolar fluid through a circular
cylindrical tube. Many authors have investigated the peristaltic
motion of non-Newtonian or viscoelastic fluid through a channel or
tube due to the relevance of peristaltic action in both mechanical
and physiological situations. For example, peristaltic mechanism
may be involved in vasomotion of small blood vessels. Here the
microstructural effects on the pressure rise, average flow and
friction force are investigated.
Contents
- W. Bodaszewski:
Algorithms of the method of statically admissible discontinuous stress fields (SADSF)
Part III. Software implementation and example problems formulated for fields
around nodes
- Summary of Part III: Boundary problems, characteristic for the
already-known fields around convex and concave corners, are used
in this part of the paper as the examples to present juxtaposition
of conditions, and to obtain a solution for general conditions of
the system - important for the fields that appear around nodes.
The presented variants of these systems and the sets of unknowns,
after minor completion, give the basis for deriving series of
elementary problems, which are necessary to create the algorithm
for solving arbitrary boundary problems, such as those encountered
in the fields around nodes. The algorithm created on such a basis
does not require formulating any particular relationships, and its
implementation makes it possible to find any solution to the field
around the node. The solution, presented in an illustrative
graphical form, can then be easily edited. In effect, it becomes
possible to test, almost instantaneously, admissibility of the
structures, and verify the existence of solutions on the physical
plane.
- The paper also presents short description of properties of the
fields around nodes that facilitates interpretation of the
results. It is particularly useful in the cases when one obtains
surprising results, for example when structural degenerations
(collapses) appear.
- It is worth mentioning that, with boundary conditions formulated
for fields around both the above-mentioned types of corners, one
obtains not only fields identical with the prototype, but also a
whole variety of other fields that until now have been treated as
different ones. Actually, these are the fields being solutions to
the same boundary problem.
Contents
- G. Skorulski:
Experimental modelling of the influence of boundary conditions on kinematics
of the extrusion process
- The aim of this paper is to analyses the influence of boundary
conditions on plastic flow kinematics during hot extrusion of
aluminium alloys. Clay and plasticine have been used as a
substitute material. The shape and distribution of a dead zone,
conditions of increasing the boundary layers and their influence
on flow kinematics have been done using the modelling experiment.
Kinematics of plastic flow and especially, range of deformation
region allows to predict stresses distribution on contact surface
between the die, container and the extruded material.
Contents
- P.K. Sharma, R.C. Chaudhary:
Flow through porous media induced by an impervious rotating disk
in the presence of magnetic field
- The flow of an electrically conducting viscous incompressible
fluid, due to an infinite impervious rotating disk bounded by
porous medium is discussed. It is assumed that the flow between
the disk and the porous medium is governed by Navier-Stokes
equations and that in the porous medium - by Brinkman equations.
A uniform magnetic field is applied in the direction normal to
flow. At the interface (porous medium - clear fluid boundary), a
modified set of boundary conditions is applied. Analytical
expressions for the velocity and shearing stress are calculated
and effects of various parameters upon them are examined.
Contents
- M.R. Khoshravan, M. Monir Vaghefi:
Numerical evaluation of delamination on mode II in glass fiber
reinforced composites
- In this paper, delamination of Mode II in a stratified glass
fiber-epoxy resin under static loading is investigated. From the
results obtained by the finite element method, using the criteria
of Irwin-Kies and other theories of elasticity, the strain energy
release rate is evaluated. The obtained numerical results are
compared with known experimental and theoretical results.
Considering local effects, such as fiber bridging in the finite
element program, the scatter between experimental and numerical
results is evaluated. The specimen is an ENF (End-Notched Flexure)
beam and finite element analysis is carried out using the ANSYS
software.
Contents
- K. Ch. Wierzcholski:
Comparison between impulsive and periodic non-Newtonian lubrication
of human hip joint
- This paper shows numerical comparisons between lubrication of
human hip joint gap in unsteady impulsive and periodic motion. We
assume that spherical bone head in human hip joint moves at least
in two directions namely in circumference and meridian directions.
Basic equations describing synovial fluid flow in human hip joint
are solved on the analytical and numerical way. Numerical
calculations are performed in Mathcad 11 Professional Program,
taking into account the method of Finite Differences. This method
satisfies stability of numerical solutions of partial differential
equations and gives real values of pressure and capacity forces
occurring in human hip joints.
Contents
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