ENGINEERING TRANSACTIONS
ROZPRAWY IN¯YNIERSKIE
A QUARTERLY JOURNAL
- J. Kaleta, P. Wiewiórski:
Magnetic field distribution detecting and computing methods for experimental mechanics
- L.W. Meyer, N. Herzig, F. Pursche, S. Abdel-Malek:
Material behavior under dynamic mono- and biaxial loading
- B.D. Khristoforov:
Research on influence of impact of microparticles and sewing needles on destruction of solid bodies
- E. Cadoni, A.M. Bragov, A. Caverzan, M. di Prisco, A. Konstantinov, A. Lomunov:
Mechanical response of HPFRCC in tension and compression at high strain rate and high temperature
- S. Wolny, F. Matachowski:
Analysis of loads and stresses in structural elements of hoisting installations in mines
- J. Kaleta, P. Wiewiórski:
Magnetic field distribution detecting and computing methods for experimental mechanics
- This paper presents the design and measuring potential of the latest generation of the
magnetic scanner called Magscanner-Maglab System (MMS) which enables a fast acquisition
of 3D signals from magnetic sensors and their visualization as digitalized magnetic images for
a variety of flat and cylindrical objects. MMS can be used as entirely autonomous or combined
(through common control) with a typical material testing machine for static load and fatigue
tests. The system can be used to investigate magnetomechanical phenomena and identify their
models in experimental mechanics, as well as detect and locate strain fields, areas of plastic
deformations and cracks in industrial processes. It has been used recently to measure the
magnetic field around objects subjected to technological processing in order to check their
quality.
Contents
- L.W. Meyer, N. Herzig, F. Pursche, S. Abdel-Malek:
Material behavior under dynamic mono- and biaxial loading
- This paper gives an overview of different testing methods and the mechanical material
behavior including mono-axial and multi-axial testing under high rate loading. Special emphasis is laid on difficult loading conditions and loading states such as a high temperature and
high strain loading (ϑ > 1200°C, φ > 1) and multiaxial impact tests. The impact behavior
of selected materials is shown and compared for different loading conditions. Furthermore,
a distinction is made between virgin and manufactured material behavior (e.g. welding) or
pre-damaged materials. Specifically, if the influence of the manufacturing history is investigated. Under certain loading states the impact material properties show a dramatic difference
compared to the virgin state of the material. Some examples of different material behavior
under the conditions previously mentioned are given.
Contents
- B.D. Khristoforov:
Research on influence of impact of microparticles and sewing needles on destruction of solid bodies
- Impact of powders and sewing needles accelerated by explosion on various obstacles has
been studied. Formation of channels up to 100 particle diameters in length has been observed
when corundum and tungsten powders impacts on steel and duralumin at speeds up to 2 km/s.
A mechanism of such super deep penetration of powder jets into metals has been proposed.
The possibility of destroying by needles such objects as plexiglass blocks, antimeteorite screens,
containers with elastic and explosive materials with a released energy exceeding the energy of
needles has been shown. At impact speeds up to 400 m/s the depth of needles penetration
into metals is 3-5 times higher than the one calculated for pointed rods at plastic work.
The obtained results can be useful for modeling of impact of meteorites, space scraps and
technological wasteson space aircrafts and their components.
Contents
- E. Cadoni, A.M. Bragov, A. Caverzan, M. di Prisco, A. Konstantinov, A. Lomunov:
Mechanical response of HPFRCC in tension and compression at high strain rate and high temperature
- The mechanical response of High Performance Fibre-Reinforced Cementitious Composite
(HPFRCC) has been analyzed at high strain rates and high temperature. Two experimental
devices have been used for compression and tension tests: the traditional Split Hopkinson
Pressure Bar for compression and the JRC-Split Hopkinson Tension Bar for tension. The
HPFRCC was thermally damaged at 3 temperatures (200°C, 400°C and 600°C) in order to
analyze the dynamic behaviour of this material when explosions and fires took place in a tunnel.
Results show that significant peak strength increases both in tension and in compression. The
post-peak strength in tension depends on the thermal damage of the material. Its strain-
rate sensitivity and thermal damage have been illustrated by means of a Dynamic Increase
Factor. These results show that it is necessary to implement new expression of the DIF for the
HPFRCC, therefore more and more accurate and experimental studies using Kolsky.Hopkinson
Bar methods are needful.
Contents
- S. Wolny, F. Matachowski:
Analysis of loads and stresses in structural elements of hoisting installations in mines
- Shaft steelwork-conveyance interactions are present in the literature on the subject avail-
able in Poland, these problems have been extensively studied by the research teams from
AGH-UST, the Central Mining Institute and the Silesian University of Technology. Despite
novel and original solutions in this field, fresh problems tend to appear which have to be solved
promptly. In this context an attempt to determine the force of steelwork-conveyance interaction due to irregularities of the guiding string might prove useful in the strength analysis of
the conveyance or the shaft steelwork.
- This study attempts to determine the steelwork-conveyance interaction force and carrying
elements stresses based on the dynamic analysis of the hoist operation, taking into account the
irregularities or misalignment of the guiding string and their random occurrence. To validate
the model some experiment on a real object were done.
Contents
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