Wszystkie pola: barnat - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Numerical simulation of blast resistant steel plate strengthened with composite
Autorzy:: Kosiuczenko, K.
Niezgoda, T.
Barnat, W.
Panowicz, R.
Powiązania:: https://bibliotekanauki.pl/articles/245529.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: blast
composite
FEM
ply
simulation
Opis:: The paper presents the process of enhancing blast resistance of a thin steel plate by reinforcing it by a composite. The composite consisted of five differently orientated layers of high resistant S2/Glass fabric. Such system was subjected to a pressure wave generated by detonation of small TNT charge placed at a certain distance from the plate. Reinforcing the plate with composite layer improved the ballistic and blast wave protection level of the shield. Due to the usage of the composite the overall mass of the entire plate raised only slightly. Proposed solution can be used to improve the characteristics of existing armours by adding extra panels or modifying armours of transport vehicles. For the purpose of the numerical analysis, the Finite Element Method and explicit time integration were used. Calculations were done using LS-Dyna software. Numerical solutions of both steel plate and steel plate with composite are presented and evaluated. Pressure wave of the blast impulse, the physical model of the blast test, Structure of the four composite layer, deformation shape of steel-composite plate (pressure wave in Z-direction, t=1 ms), failure of plies, Huber-Mises-Hencky stress as material effort on plate are presented in the paper.
Źródło:: Journal of KONES; 2011, 18, 3; 155-160
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Numerical simulation of dynamic weld compression
Autorzy:: Barnat, W.
Kordys, M.
Moćko, W.
Dybcio, P.
Panowicz, R.
Powiązania:: https://bibliotekanauki.pl/articles/247316.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: Split-Hopkinson Pressure Bar
SHPB
welding
weld
Opis:: The article presents some numerical results and experimental validation of Split Hopkinson pressure bar (SHPB) tests for welded S40NL steel. The goal of this research is to define material constants for modelling it in FEM. Steel was tested with Charpy impact test to determine properties of material. Next, the joint for welding was prepared. It was welded with electric arc welding method (MAG) with flux-cored wire. Hopkinson bar test is well-known experiment method used to determine material properties at high strain rates. The tests were performed in Institute of Fundamental Technological Research. Material properties for Johnson-Cook material model were obtained. Comparison between experimental results taken in quasi-static conditions and dynamic conditions proves that the behaviour of materials in those two states is quite different. Results from one type of loading condition cannot be used to create a realistic model of material when it is loaded dynamically. Numerical simulation of Hopkinson bars was performed on cylindrical model with known length and accelerated to high speed in direction of incident bar. For the purpose of the simulation, a Finite Element Code LS-DYNA was used. It allows simulation of dynamic response of SHPB system. The results show quite good agreement. The model can be used to simulate weld performance under high strain rate.
Źródło:: Journal of KONES; 2012, 19, 2; 35-43
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Analysis of a light caterpillar vehicle loaded with blast wave from detonated IED
Autorzy:: Barnat, W.
Niezgoda, T.
Panowicz, R.
Powiązania:: https://bibliotekanauki.pl/articles/247638.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: IED
vehicle shell
FE analysis
ground
Opis:: More and more impudent attacks on the military convoys in Afghanistan proved a huge danger of the improvised explosive devices - IED. Huger and more clever charges are a serious problem for vehicles protection. Additionally, hitherto defence standards and STANAG didn't predict such huge charges. Majority investigations were based on a 3 kg anti-tank mine. The article presents the results of numerical calculations for the elements of the combat vehicle supporting structure loaded with an impact generated by explosion of a huge explosive charge under the bottom of the vehicle with consideration of the wave reflected from the ground. Such an approach allows obtaining a good approximation of numerical simulations to real conditions of terroristic attacks. Additionally, the analysis of IED side influence on the vehicle shell was conducted. The explosive charge — IED — was simulated with the use of concentrated energy of properly selected (on the base of literature investigations) density and initial energy. During analyses of side explosive on the vehicle structure, the obstacle in the form of a building increasing the pressure impulse was taken into account. The paper presents the results of a numerical analysis in which Euler and Lagrange domains(describing a vehicle) were coupled. A perfect gas model was used to describe air parameters.. Additionally, the ground was described with a gas model. Every kind of material data were selected on the base of experimental investigations. A bilinear material model with a Cowper and Symonds strain rate model was used to describe a vehicle. Such an approach fully describes the phenomena occurring in the system.
Źródło:: Journal of KONES; 2010, 17, 4; 27-34
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Experimental and numerical buoyancy analysis of tracked military vehicle
Autorzy:: Kotowski, M.
Barnat, W.
Grygorowicz, M.
Panowicz, R.
Dybcio, P.
Powiązania:: https://bibliotekanauki.pl/articles/242914.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: buoyancy
military vehicle
amphibious vehicle
CFD
Opis:: The paper presents experimental validation of numerical flow analysis around tracked amphibious military vehicle. The aim of the study was to validate the simulation results and visualize the flow around optimized geometry To perform numerical simulations, a Computational Fluid Dynamics code FLUENT was used. The software is dedicated to model flow, turbulence, heat transfer, and reactions. The area was divided into two domains – air and water. During the simulation, water was moving with speed specified in standardization. However the numerical techniques are constantly developed and improved there is still a strong need for verification especially in buoyancy analysis and water performance evaluation. Results showed quite good agreement with literature after some modifications of the model. Then the flow was numerically visualized. That allowed in-depth analysis of the flow around each of vehicle's parts and some major and minor modifications were proposed. Modified geometry was analyzed and obtained results will be compared with previous ones. Additional stability and manoeuvrability tests were conducted. The results will be used to modify the geometry of vehicle and conduct experimental tests to verify the numerical code performance and check the actual change in vehicle's water performance. Future work will also consider propeller influence on results.
Źródło:: Journal of KONES; 2012, 19, 4; 321-324
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Numerical analysis of ceramic-steel-composite shield subjected to ballistic impact of the fragment
Autorzy:: Kosiuczenko, K.
Niezgoda, T.
Barnat, W.
Panowicz, R.
Powiązania:: https://bibliotekanauki.pl/articles/244582.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: ballistics
ceramics
composite
fragment
multilayer
simulation
Opis:: The issue of missile impact resistance is discussed in detail in many articles and standard papers dealing with body armour. The experience from many armed conflicts, however, may be proof that the real risks are related to a greater degree to fragments than those of bullets. It can be shown that the more often the object is destroyed as a result high-velocity impact of fragments. The paper describes the results of numerical simulations of 22 calibre bullet shrapnel piercing multilayer ballistic shield. The shield was made of ceramics, steel and composite materials. The shape of the fragment is based on the American the defence standard MIL-DTL-46593B. The fragment tested is made through the process of cold rolling steel 4337H or 4340H characterized by hardness of about 30 units on the Rockwell scale. The mass of the fragment is 17 grains (1.14 g). The ballistic shield, that was hit by fragmentation, was a rectangular plate made of a Kevlar composite and, in another variant, an epoxy composite. The test was conducted in accordance with the terms of ballistic fragmentation resistance test V50 contained in standard MIL-STD-662F. In undertaking the simulation was used the Finite Element Method (FEM) which is implemented in LS-Dyna programme. The numerical calculations were performed in the explicit option on a multiprocessor computational cluster. The necessary information to build a model like materials’ properties is taken from extensive literature. The numerical simulation resulted in, inter alia, maps and diagrams of stress, strain and energy, which were treated to further detailed analysis. On this basis of an evaluation was carried out and correction made to the FEA model. The resulting model has enabled an observation of the penetration of the ballistic shield and the ballistic behaviour of the fragment when it contacts with obstacle. These observations are essential in the design of modern protective structures and undertaking research without incurring excessive financial costs generated by laboratory experiments.
Źródło:: Journal of KONES; 2011, 18, 1; 295-300
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Introduction to modelling side IED explosion influence on special military vehicle
Autorzy:: Barnat, W.
Sławiński, G.
Moneta, G.
Panowicz, R.
Powiązania:: https://bibliotekanauki.pl/articles/241755.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: special military vehicle
improvised explosive devices
blast wave
numerical study
Opis:: One of the most endangering and challenging threats during recent warfare are explosions of Improvised Explosive Devices (IED) and their destructive influence on a light armoured vehicle. Providing sufficient protection is the most challenging issue which can be achieved thanks to complex studies and a proper design process. The article presents preliminary numerical analyses of side explosion near a special military vehicle with regards to newdeveloped standards. The results were used to modify the existing hull and enhance its protection capabilities against critical charge to provide better protection for personnel inside the vehicle. A numerical model was developed in LSPrePost software. All the computational analyses were carried out using an explicit LS-Dyna solver, where material properties of finite elements were described by the Johnson-Cook material model with the basic parameters specified in the standard tensile tests. Due to time consuming simulations, the Linux-based computational cluster was adopted. The setup (mass of the explosive, distance between explosive charge and vehicle, etc.) was taken from military codes. In their computational research, the authors performed also a kind of a sensitivity study changing some of parameters. Pressure, stress distribution and plastic deformations vehicle structure were analyzed.
Źródło:: Journal of KONES; 2012, 19, 4; 15-20
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Influence of armoured vehicles bottom shape on the pressure impulse
Autorzy:: Barnat, W.
Panowicz, R.
Niezgoda, T.
Powiązania:: https://bibliotekanauki.pl/articles/243701.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: IED
improvised explosive device
mine resistance
armour
deflector
hull design
light armoured vehicle
Opis:: This paper presents the results of a numerical analysis of military vehicles hulls mine resistance. The research concerns armours loaded with blast wave from large IED charges in three cases. First is an explosion in Euler domain without any boundary conditions. Second consists of Euler domain with flat bottom and the ground. Third is simulated Euler domain with ground and deflector. Boundary conditions used both in second and third case resulted in growth of the pressure impulse due to the reflection from a rigid obstacle. In the article different hull bottom shapes are compared. The gap between the bottom and the ground is fixed in all cases. Explosion in Euler domain without limitations is added as a reference. The blast wave caused by the detonation (simulated as a point detonation) propagated in cubic mesh with appropriate boundary conditions. Theoretical solution of spherical non-linearity is given in a form of Taylor equations. It was used to verify the numerical model. The research showed that the ground proximity affects the results of the simulation. The pressure impulse is amplified due to the wave reflection from both the bottom of the vehicle and the ground. As well as that, the study confirmed that the usage of the deflector considerably reduces the impact load to the structure.
Źródło:: Journal of KONES; 2011, 18, 1; 39-46
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Numerical analysis of initial and boundary conditions influence on the crew of tracked vehicle and the ground
Autorzy:: Barnat, W.
Panowicz, R.
Niezgoda, T.
Dybcio, P.
Powiązania:: https://bibliotekanauki.pl/articles/243703.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: hull design
tracked vehicle
Opis:: The problem of vehicle's impact resistance is broadly discussed in many articles and standardizations concerning special structures. In this paper, the numerical analysis results of an armoured vehicle loaded with blast wave are presented. Effects of ground proximity such as wave reflection are also taken into account. What is more, the tracking system was also included in calculations. The ground was modelled using Mie-Grüneisen equation of state. In the research an ALE coupling algorithm was used to model interaction between fluid (Euler domain) and structure (Lagrange domain). Euler description is used for air and blast wave propagation modelling, whereas structure is described by Lagrange equations of mass, momentum and energy conservation. The ALE coupling algorithm is implemented in MSC Dytran software. The problem was solved using explicit integration of movement equations over time. The research showed that ground and wheels considerably affect the simulation results. The pressure impulse on the vehicle's bottom increased by 40 per cent compared to the model in which these effects were not considered. Furthermore, the quality of the results increased as the solution obtained is more physical. Proposed method is a useful tool in hull design process. As well as that, the method will be further developed to include more detailed model of the vehicle.
Źródło:: Journal of KONES; 2011, 18, 1; 31-38
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Analysis of a protective composite panel with energy adsorbent in the form of foamed aluminium
Autorzy:: Barnat, W.
Panowicz, R.
Niezgoda, T.
Gieleta, R.
Powiązania:: https://bibliotekanauki.pl/articles/247656.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: blast wave
analytical model
FE analysis
aluminium panel
Opis:: The article presents the results of the investigations into modelling a blast wave for huge charges of l kg TNT equivalent. Modelling of huge charges is a very interesting problem due to a scale effect. During numerical analyses a detonation phenomenon was ignored (for the reason of the analysis time). The paper considers the effects of the influence of a pressure wave coming from a huge TNT charge (modelled with energy) on a 6 mm thick steel plate as well as on a protective panel made of foamed aluminium with composite layer. A panel of foamed aluminium was used for the protection of the described plate. The particular elements of a panel, subjected to an experimental analysis, were jointed with the use of a glueing method. In the numerical model the particular component layers were jointed with contact. The ALE (Arbitrary-Lagrange-Euler) function was used for coupling between the Euler domain and the Lagrange domain. The method requires absolute location compatibility of the nodes from both jointed areas. In the results of the conducted investigations, the permanent deformation of the steel plate was obtained.. Additionally, the possibility of the steel plate deformation evaluation was considered on the basis of accessible literature. Due to a huge charge, the analysis was performed with the use of the finite element method with the eiperimental verification.
Źródło:: Journal of KONES; 2010, 17, 4; 35-44
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Investigation of a panel with an elastomer layer plus carbon fibres loaded with a blast wave
Autorzy:: Barnat, W.
Niezgoda, T.
Gieleta, R.
Panowicz, R.
Powiązania:: https://bibliotekanauki.pl/articles/247636.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: blast wave
experiment
FE analysis
elastomer layer
Opis:: Terrorist attacks are directed against the most important elements of the infrastructure and human life. Crews of the combat vehicles as well as transmission installation of oil, gas and electric energy are, first of all, exposed to such operations. Such a situation caused striving to increase the safety against the activity of short-time loads coming from explosions [l, 2]. The object of the presented investigations was a numerical-experimental analysis of an elastomer layer of the protective panel combined with an experimental verification. Developed elastomer structures constitute perspective materials and will be applied to solve the problems connected with the increase of combat vehicle safety as well as trouble constructions of pipelines and gas pipelines especially in the dangerous places such as passages over rivers. A plate with an elastomer layer (with carbon fibres) loaded with a 100 g TNT charge was subjected to the analysis. The numerical analysis was verified experimentally. The results of the conducted analyses will be applied in further works on the selection of the kinds and parameters of the energy absorbing layers. They will be also used for further validating and optimizing investigations, which will aim at absorbing or dispersion of a maximum great value of energy influencing the energy absorbing panel. Such panels can be used for constructing armoured vehicles and protective elements of stationary strategic constructions. The constructions which can be exposed to damages resulted from a different kind of dynamic forces such as impacts or influences of the pressure wave comingfrom detonation of an explosive material should have the structure enabling absorption of as great as possible part of energy which influences them. Energy absorbing elements are constructed in the form of sandwich structures coats with a specially selected core material. One of the interesting types of materials which can be used for this purpose is elastomer. These materials enable significant increasing of the protective degree due to their capacities of absorbing energy of a blast wave. Applying of these materials results in decreasing of vibrations frequency of a system loaded with a pressure impulse.
Źródło:: Journal of KONES; 2010, 17, 4; 19-26
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Numerical analysis of a lightarmoured vehicular personnel carrier loaded with a mine oried explosion on a human transported in it
Autorzy:: Panowicz, R.
Barnat, W.
Sybilski, K.
Niezgoda, T.
Powiązania:: https://bibliotekanauki.pl/articles/247409.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: explosion
vehicle
ground
dummy
Opis:: The armedforces involvement in stabilization operations conducted either in Europe (Kosovo) or in Africa (Iraq) or in Asia (Afghanistan) caused uncovering of weak points of the used equipment which was not constructed for the purpose of partisan war. This fact resulted in equipment modernisation in the form of additional armouring and protection against mines and improvised explosive devise as well as in NATO adopting the standards determining the protection level assuring by the given vehicle. The most popular military standard in the scope of ballistic protection against the pressure wave coming from a mine or improvised explosive device detonation is standard NATO -STANAG 4569. This standard determines to a great degree also the charge size and position. Civil solutions are based not on the evaluation of the vehicle destruction level but on the evaluation of some parameters determining the injuries of the human moving in a vehicle which had an accident. These parameters will be used to evaluate the injuries of the human moving in a lightarmoured vehicular personnel carrier which is subjected to the influence of wave pressure wave coming from the detonation of a mine or improvised explosive device. The finite elements model of a dummy Hybrid III 95% Male and Ls-Dyna software will be used for this purpose. There will be considered the complex model in which there is not only a human and vehicle model but also a charge, air and ground.
Źródło:: Journal of KONES; 2010, 17, 3; 355-360
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Wpływ umiejscowienia ładunku wybuchowego na intensywność fali podmuchowej
Numerical simulation of blast wave
Autorzy:: Panowicz, R.
Barnat, W.
Powiązania:: https://bibliotekanauki.pl/articles/208831.pdf
Data publikacji:: 2010
Wydawca:: Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:: metoda elementów skończonych
model konstytutywny gruntu
fala podmuchowa
finite element method
soil constructive relation
blast wave
Opis:: W pracy przedstawiono wstępne wyniki badań nad rozprzestrzenianiem się fali podmuchowej pochodzącej od wybuchu 2,5 kg ładunku trotylu. Rozpatrzono najczęściej spotykane przypadki umiejscowienia ładunku w stosunku do powierzchni gruntu: na powierzchni, równo z powierzchnią, 5 i 10 cm pod powierzchnią gruntu. Do opisu procesu detonacji wykorzystano przybliżenie optyki detonacyjnej, a zachowanie się produktów detonacji opisano równaniem JWL. Zachowanie się elementów modelu opisano za pomocą równań mechaniki ośrodków ciągłych w ujęciu Eulera. Badano wpływ związku konstytutywnego opisującego zachowanie się gruntu na intensywność fali podmuchowej. Praca ma charakter aplikacyjny do badań nad bezpieczeństwem załóg znajdujących się w lekkich patrolowych pojazdach opancerzonych.
The numerical simulations' results of the detonation of improvised explosive device which was laid on the soil or was buried, and blast wave propagation in the air, are considered. Different constitutive models of soil are taken under attention. They have not great influence on pressure wave in the air, but they have great significance on crater size and shape. The simulations show that the maximum pressure, duration of the pressure impulse and its shape varies with depth of burial. The Euler finite element method (LS-Dyna) was used to solve the problem.
Źródło:: Biuletyn Wojskowej Akademii Technicznej; 2010, 59, 1; 143-151
1234-5865
Pojawia się w:: Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Computer modelling of complex action system of blast wave arising from mine or IED explosion on light armoured vehicle
Autorzy:: Panowicz, R.
Niezgoda, T.
Barnat, W.
Sybilski, K.
Powiązania:: https://bibliotekanauki.pl/articles/247669.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: explosion
finite element method
light armoured vehicle
Opis:: In this paper the results of computer simulation of blast wave action arising from mine or IED explosion on wheeled light armoured vehicle will be presented. In the last years the NATO STANG 4569 international standard has been prepared. It describes the test standards concerning the ballistic resistance of vehicles not only to missiles but also to fragments and pressure wave arising from mine or IED explosion. In accordance with this standard the explosive charge is placed under ground surface (independently to the charge position in relation to the vehicle-under the wheel or under the vehicle centre). This case is of frequent occurrence during the different stabilization missions conducted by our troops both in Iraq and in Afghanistan. In the calculations the possibility of coupling between the medium described with the aid of Eulerian equations and the medium described with the aid of Lagrange equations has been used. The coupling enables the complex description of the issue. The detonation process has been described approximately of detonation optics and the behaviour of detonation of explosive device has been described with the aid of JWL equation in common use. Such approach to the subject is sufficient to resolve mast engineer problems. The vehicle has been described with the aid of Lagrange elements with corresponding material properties. The effect of high masses has been taken into account, in particular the effect of engine on behaviour of the object. The adequate coupling of the mediums above- mentioned has been very difficult during the numerical work, but additional taking the ground in consideration has improved considerably the quality of the results obtained which are nearer of the real results.
Źródło:: Journal of KONES; 2010, 17, 4; 385-390
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Numerical analysis of a shell with a main shaped charge warhead stroke into a bar armour with square section
Autorzy:: Niezgoda, T.
Panowicz, R.
Sybilski, K.
Barnat, W.
Powiązania:: https://bibliotekanauki.pl/articles/247419.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: mechanics
finite elements method
bar armor
RPG
Opis:: Recent operations of Polish troops within the framework of peacemaking missions' uncovered weak points of the equipment used there. It turned out that one of the most significant threats is a shell equipped with a main shaped charge warhead used by partisan detachments. These can break even 900mm of shell-proof steel so it is very difflcult to protect anything from the shells. One of the ways of protection from high explosive anti-tank (HEAT) warheads is using bar armours. This paper focuses on analysis of a shell with PG-7G main shaped charge warhead stroke into a bar armor with a square section. This work presents a short description of the analyzed object. Moreover, there is a principle of operation of a shell with the speciflcation of the most trouble elements from the point ofview of high velocity partial stream creation. In addition, the paper indicates steps of a numerical model construction together with geometry simplifications and initial-marginal conditions. On the basis of the results the researchers evaluated the extent of destruction of shell key elements. Furthermore, the work indicates drawings with deformed parts and presents stresses maps of these elements. The summary states to what extent PG-7G shell stroke into the armor made of bars with a square section influences reduction of operation efficacy of this type of firearm. Calculations were conducted in LS-Dyna system, which is used for oscillation analyses with a finite elements method. In order to solve the motion equation the researchers used an ordinary integration method used for i.e. analyses of highly non-linear oscillation phenomena.
Źródło:: Journal of KONES; 2010, 17, 3; 327-332
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Numerical investigation of the influence of a rigid obstacle on the multiple reflected pressure impulse
Autorzy:: Barnat, W.
Panowicz, R.
Niezgoda, T.
Powiązania:: https://bibliotekanauki.pl/articles/247658.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: pressure impulse
analytical model
FE analysis
influence of the obstacle on the reflected wave
Opis:: The article presents the case of multiple reflection ofa blast wave from a rigid obstacle. The pressure impulse was generated in the Euler domain according to Taylor-Sedov theory. Additionally, there the results of numerical and analytical investigations on the behaviour of the reflected pressure impulse from the flat stiff obstacle were discussed. The analytical considerations are pursuant to the accessible literature. This case is identical with the explosion under a flat bottom of the tank-type vehicle or BWP. All the considered obstacles which are influence by the pressure impulse are similar to the construction of the vehicles used by Polish Army. As it was mentioned above, the numerical investigations were supported by analytical modelsfrom the scientific literature. In the previous papers, the authors conducted the numerical and experimental investigations on the flat blast wave. Those papers concentrated on the selection of the Euler domain parameters and parameters describing an explosive charge for numerical analyses. Additionally, the parameters of the boundary elements of the Euler domain were selected in order to unable the uncontrolled influence of gases. The innovation presented in the paper is the description of the issue of the numerical problem of multiple pressure impulse reflection from a rigid obstacle. The presented papers aim at increasing the safety of the military vehicles crews during the stabilisation missions in Iraq and Afghanistan.
Źródło:: Journal of KONES; 2010, 17, 4; 45-54
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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