Temat: BLAST - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Experimental and numerical study of influence of incidence angle of shock wave created by explosive charge on the steel plate
Autorzy:: Barnat, W.
Powiązania:: https://bibliotekanauki.pl/articles/201542.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: blast
blast protection
structural response
FEM
Opis:: This paper presents experimental and numerical studies on influence of an incidence angle of the shock wave on a steel plate. The problem of interaction between the wave front and a barrier is important from the point of view of protection the crew of armored vehicles. One way of remedying the harmful effects of impacts of the shock wave is the reflection wave of the barrier set at an angle to the face of the wave. The article presents the numerical and experimental approach to the subject. The numerical part presents four models in which the plate was set at angles 0◦, 15◦, 30◦, 45◦. In each case, the plate was loaded by a wave formed after the explosion 2 kg of TNT. In the experimental part the results are presented from an experiment in which the wave was formed from 2 kg TNT detonation at a distance of 0.4 m in parallel to the steel plate.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 1; 151-163
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Infuence of Different Parameters on the TNT-Equivalent of an Explosion
Autorzy:: Simoens, B.
Lefebvre, M. H.
Minami, F.
Powiązania:: https://bibliotekanauki.pl/articles/357938.pdf
Data publikacji:: 2011
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:: emulsion explosive
cylindrical charge
blast overpressure
blast impulse
Opis:: Emulsion explosives are used in a wide range of applications, amongst which some in closed vessels, where the properties at short range need to be known. A series of tests with spherical charges has been carried out to determine the TNT-equivalent at short range of an explosive emulsion based on both peak overpressure and impulse. Generally, the value is found to be constant over the considered range, with a value of 1 for overpressure and of 0.7 for impulse. In most common applications, explosive charges are not spherical. Experiments with cylindrical charges have been performed to study the infuence of (1) the shape of the charge (length-to-diameter ratio) and (2) the location of initiation (central or at one end). At the considered range, increasing L/D increases the peak overpressure and the impulse perpendicular to the axis, but decreases these effects on the axis. The central initiation causes the largest effects on the centreline. The initiation at one end causes a shift in the location of the peak overpressure, but the highest impulse remains on the centreline.
Źródło:: Central European Journal of Energetic Materials; 2011, 8, 1; 53-67
1733-7178
Pojawia się w:: Central European Journal of Energetic Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: An assessment of reliability of a blast wall using limited statistical information on blast loading
Autorzy:: Vaidogas, E. R.
Kisežauskien, L.
Juocevičius, V.
Powiązania:: https://bibliotekanauki.pl/articles/2069199.pdf
Data publikacji:: 2013
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: reliability
blast wall
explosion
blast loading
sacrificial cladding
small-size sample
Opis:: A design of a blast wall is considered. Methods of structural reliability analysis and quantitative risk assessment are applied to the design. The basic idea of this design is to apply a probability of failure of cladding components as a criterion of damage to the cladding. This probability is used as an estimate of the proportion of cladding components destroyed by an explosion. The cladding failure probability is estimated by quantifying and propagating uncertainties related to a mechanical model of cladding and elements of the statistical sample containing records of blast loading. It is demonstrated how to estimate the cladding failure probability when the size of this sample is small from the standpoint of classical statistics. The case study included in the paper considers a design of a cladding for a blast wall to be deployed for protecting a fuel tank against an explosion of a railroad tank car.
Źródło:: Journal of Polish Safety and Reliability Association; 2013, 4, 2; 259--266
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Influence of the shape of the explosive charge on blast profile
Autorzy:: Hryciów, Z.
Borkowski, W.
Rybak, P.
Wysocki, Z.
Powiązania:: https://bibliotekanauki.pl/articles/247727.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: cylindrical and rectangular charge
blast overpressure
blast impulse
LS-DYNA
ALE
Opis:: When an explosive charge is fired, the nature and mass of the explosive are the only parameters of importance usually considered. The shape however, also plays a major role in the effect of an explosive charge. Knowledge of shape effect can be important before the use of the explosive (in order to create a maximum effect with a given mass of explosive), or in post-explosion damage assessment. The shape effect however is only significant within a certain range from the charge. At longer distance, the produced blast wave tends to be spherical. The shock wave parameters studied in this work are the peak overpressure and the first positive impulse. A series of numerical test has been performed in order to determine the range of influence of the charge shape. Different locations of initiation were compared. A hemispherical charge was point detonated at its centre whereas a cylindrical shape was detonated at the centre of an upper or lower plane. Numerical simulations of near field burst were conducted using LS-DYNA software. During numerical tests a pressure fields were determined for different shapes of explosive charges as well as the pressure waveforms at points located 1000 mm from a centre. Additionally, reference pressure history curves from LOAD_BLAST_ENHANCED procedure were calculated.
Źródło:: Journal of KONES; 2014, 21, 4; 169-176
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Comparison of numerical testing methods in terms of impulse loading applied to structural elements
Autorzy:: Mazurkiewicz, Ł.
Małachowski, J.
Baranowski, P.
Damaziak, K.
Powiązania:: https://bibliotekanauki.pl/articles/280777.pdf
Data publikacji:: 2013
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: blast wave
FEM
Eulerian mesh
Opis:: This paper presents comparison of numerical testing methods of an impulse loading which comes from a detonation process, i.e. blast wave propagation in a gas medium. Investigations were carried out using an analytical and numerical model based on the Finite Element Method. In order to reduce computational time, the substitute analytical model with one degree of freedom was implemented, which replaced a chosen actual system (I-section steel column). For structure modelling, the constitutive model was used, which included the strain rate effect. From the performed analyses, an acceptable similarity was noticed, although the discrete model due to greater forces gave inflated results. Nevertheless, it should be pointed out that simplified methods do not take any wave and flow around effects into consideration, which have an influence on the dynamical response of the structure and are possible to implement in the gas medium coupling.
Źródło:: Journal of Theoretical and Applied Mechanics; 2013, 51, 3; 615-625
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: I-beam structure under blast loading-Eulerian mesh density study
Autorzy:: Mazurkiewicz, Ł.
Małachowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/245483.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: blast wave
FEM
Eulerian mesh
Opis:: Dynamic response of an I-beam structure subjected to shock wave produced by the detonation of high explosive (HE) materials is presented in this paper. LS-DYNA, a 3-D explicit, finite element computer code is used to study this behaviour. A coupled analysis between Lagrangian formulation (solid material) and Eulerian formulation (gas medium) was performed. The latest extensive research in this area indicates that the finite element analyses of such problems require complex meshes for Euler and Lagrange formulation. This research is focused on Euler mesh density influence on coupled analysis results. The principal objective of this paper is to compare various mesh density Eulerian models in respect to accuracy and computing time and asses the limit of element size. The Eulerian domains (Air and HE) were developed with various element size from 10 mm up to 30 mm. Results from all the analysis cases show how the Eulerian mesh element size influences on the global response of the column. Models with coarse meshes give much lower dynamic response then models with finer meshes. The resultant velocity vectors were also presented to illustrate the characteristic of blast wave propagation. Moreover the numerical models computational efficiency was compared are respect of CPU Time. Models with complex meshes (below 20 mm) are very computationally expensive.
Źródło:: Journal of KONES; 2011, 18, 3; 245-252
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

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: 8.

Tytuł:: Analysis of IED sidebar explosion influence on hull of light fighting vehicle
Autorzy:: Barnat, W.
Powiązania:: https://bibliotekanauki.pl/articles/245829.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: blast
IED
protection
numerical analysis
Opis:: This paper shows preliminary numerical analysis of impact of IED sidebar blast on the hull of the light fighting vehicle in order to meet the current standards. Numerical analysis was carried out using a 3-dimensional shell FE model of the vehicle. The problem of the modelling method and computer simulations required several specific features for applied material models, e.g. physical state, plasticity, crispness, hardness. All necessary material properties were taken from the available literature or they were based on the experimental tests carried out in the Department of Mechanics and Applied Computer Science at the Military University of Technology. The STANAG 4569 is a legal basis that regulates the level of ballistic protection for such vehicles. Companies producing that kind of armoured vehicles for army, constantly look for the best and the newest energy consuming materials to ensure appropriate protection of the vehicle and the crew inside it against the effect of IED blast. The connection between a detonation wave and a formed shrapnel shell after detonation of the IED is created depending on the mass and kind of the charge. It is caused by impulsive load on a side bar or the bottom of a light vehicle. Both, safety of people and equipment endurance, is compatible with main rules that are common in Polish Army and it will be common rule in future. It is the fact that motivates the research centres and the arms industry to develop a product using advance computation method to construct new energy absorbing construction which will increase safety of the crew in the armed vehicle.
Źródło:: Journal of KONES; 2013, 20, 1; 7-14
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Optimization of the rock blastings in opencast mines using hydromite emulsion explosives
Autorzy:: Maranda, A.
Gołąbek, B.
Korytkowski, B.
Suszka, J.
Rink, P.
Powiązania:: https://bibliotekanauki.pl/articles/89128.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:: emulsion explosives
detonation parameters
blast grid
Opis:: In the current paper, measurement results of the detonation parameters for model emulsion explosives are presented, one of the matrices constituting a base for Hydromite 100 and 70; the work additionally details the results of the rock blastings, carried out by means of the above mentioned materials. The blastings were executed in the following opencast mines: Kamienna Góra, Kopalnia Granodiorytu Łazany II, Łagów V and Warta Cement Plant. The goal of the proceedings was to optimize the blast grid for specific plants.
Źródło:: Mining Science; 2014, 21; 33-41
2300-9586
2353-5423
Pojawia się w:: Mining Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: A new advisor system to detect the tap hole whistling and splashing in a Blast Furnace
Nowy system doradczy do detekcji zjawiska wydmuchiwania i rozprysku z otworu spustowego w wielkim piecu
Autorzy:: Ruiz-Bustinza, I.
Mochon, J.
Verdeja, L. F.
Garcia-Carcedo, F.
Parra, R.
Powiązania:: https://bibliotekanauki.pl/articles/353337.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: piec hutniczy
optymalizacja
blast furnace
optimization
Opis:: The objective is to determine the moment from which a Blast Furnace tap hole must be closed and consequently the exit of materials (hot metal and slag), by studying the conventional video images obtained at the exit of the tap hole of the BF in order to optimize the process performance. This point is characterized by a remarkable increase in the width of the flow which corresponds to the maximum exit of the slag surrounding the melted metal (and a significant decrease in the pig iron). This video based system is compared to the information provided by the EMF signals (electromotive forces).
W celu optymalizacji wydajności procesu wykonano pracę, której przedmiotem było określenie momentu w którym otwór spustowy wielkiego pieca musi zostać zatkany, a w konsekwencji również wypływ ciekłych produktów procesu (surówki, żużla) zakończony, określenie tego momentu, uzyskano przez analizę standardowych obrazów wideo wykonanych dla miejsca wydostania się ciekłych produktów z otworu spustowego. Moment ten charakteryzuje się znaczącym zwiększeniem szerokości przepływu strumienia, który odpowiada maksymalnemu wydostawaniu się żużla otaczającego ciekły metal (przy znaczącym zmniejszeniu wypływu surówki). System został oparty o technikę wideo, porównano go z informacjami dostarczonymi przez sygnał EMF (siły elektromotoryczne).
Źródło:: Archives of Metallurgy and Materials; 2010, 55, 4; 1125-1130
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Genetic Variability among Yield and Yield Related Traits in Selected Upland Rice (Oryza sativa L. and Oryza glaberrima Steud) Genotypes in Northwestern Ethiopia
Autorzy:: Bitew, Jember Mulugeta
Mekbib, Firew
Assefa, Alemayehu
Powiązania:: https://bibliotekanauki.pl/articles/1192657.pdf
Data publikacji:: 2016
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Blast
Brown spot
Upland Rice
Variability
Opis:: This study was carried out to assess the extent of variability for yield and yield related traits in upland rice genotypes. Twenty-two selected rainfed upland rice varieties were evaluated in randomized complete block design with three replications during 2014 cropping season. The analysis of variance revealed significant differences between the genotypes for all traits except harvest index, indicating the presence of a considerable amount of variability among the genotype. The disease reaction of different genotypes showed a significant variation for blast and brown spot. The highest disease severity was scored by variety Andaasa which is moderately susceptible to leaf blast. Tana, Andassa, Getachew, FOFIFA-4129 and FOFIFA-3730 showed moderately susceptible response to panicle blast. Severity of brown spot ranged from 1.13-6.03. The highest disease severity value was scored by variety Andasa followed by Tana, Getachew and FOFIFA-3730 which showed moderate resistance to brown spot.
Źródło:: World Scientific News; 2016, 47, 2; 62-74
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Implementation of Sapper-Blast-Module, a Rapid Prediction Software for Blast Wave Properties
Autorzy:: Sielicki, P.
Stachowski, M.
Powiązania:: https://bibliotekanauki.pl/articles/358048.pdf
Data publikacji:: 2015
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:: explosion
blast loading prediction
numerical analysis
Opis:: This paper reports on a new methodology to provide rapid predictions of blast loading from spherical TNT charges. The rapid prediction method described has been coded by the authors into the open source Scilab and Matlab programming languages. The approach presented is based on experimental data and empirical formulae collected in official standard Unified Facility Criteria. The correctness of the results is proved for the explosion of spherical, condensed charges, both in free air space and as surface explosions. By taking a standard engineering approach, any engineer should be able to predict the primary features of explosive loading and take it into account during their design processes. This code is a part of the module called Sapper-Blast. Moreover, the main part of the paper also includes a comparison of the outcome with numerical verification. The results are presented for TNT spherical charges. The numerical consideration is performed using ABAQUS Explicit code. The results allow an informed assessment of the basic properties of an explosion for an equivalent mass of TNT for any kind of condensed, spherical charge. In addition, the approach presented demonstrates the overestimation of official results due to numerical approaches.
Źródło:: Central European Journal of Energetic Materials; 2015, 12, 3; 473-486
1733-7178
Pojawia się w:: Central European Journal of Energetic Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Smoothed particle hydrodynamics versus finite element method for blast impact
Autorzy:: Jankowiak, T.
Łodygowski, T.
Powiązania:: https://bibliotekanauki.pl/articles/201966.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: FEM
SPH
blast impact
concrete slab
Opis:: The paper considers the failure study of concrete structures loaded by the pressure wave due to detonation of an explosive material. In the paper two numerical methods are used and their efficiency and accuracy are compared. There are the Smoothed Particle Hydrodynamics (SPH) and the Finite Element Method (FEM). The numerical examples take into account the dynamic behaviour of concrete slab or a structure composed of two concrete slabs subjected to the blast impact coming from one side. The influence of reinforcement in the slab (1, 2 or 3 layers) is also presented and compared with a pure concrete one. The influence of mesh density for FEM and the influence of important parameters in SPH like a smoothing length or a particle distance on the quality of the results are discussed in the paper.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 1; 111-121
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Load carrying capacity numerical study of I-beam pillar structure with blast protective panel
Autorzy:: Mazurkiewicz, L.
Kolodziejczyk, D.
Damaziak, K.
Malachowski, J.
Klasztorny, M.
Baranowski, P.
Powiązania:: https://bibliotekanauki.pl/articles/202056.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: FE analysis
blast protection
stability study
Opis:: The paper presents numerical analyses aimed at preliminary assessment of the protective panel effectiveness, which task is to protect the elements of building structures against explosion. For the criterion of assessing the effectiveness of the panel the load capacity of the column made of steel I-beam was chosen. Ultimate force was determined by using advanced computational procedure, which consisted of four stages: preload, blast simulation, dynamic response and static analysis of deformed structure. Blast load was simulated using Lagrangian- Eulerian domain coupling. Results indicated that the application of the protective panel significantly reduces the plastic deformation of the structure.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 2; 451-457
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

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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