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Tytuł:
Methods of CO2 acquisition and costs reduction in shale rocks fracturing technology
Autorzy:
Miedzińska, D.
Niezgoda, T.
Powiązania:
https://bibliotekanauki.pl/articles/299042.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
fracturing
shale gas
carbon dioxide
economics
Opis:
The innovative method of shale gas recovery with the use of subcritical CO2 is currently developed within the project titled “Development of guidelines for design of innovative technology of shale gas recovery with the use of liquid CO2 on the base of numerical and experimental research – DIOX4SHELL ”, supported by the National Centre for Research and Development (NCBR). The project is carried out by Polish company PGNiG and by academics from WAT, AGH and PW (Military University of Technology, AGH University of Science and Technology, and Warsaw University of Technology). Finding the best business model, in which costs of CO2 production or acquisition are negligible is one of the most important factors influencing the economical effectiveness of the technology. The main part of known CO2 acquisition methods is based on fuel purchase and its combustion, what is very expensive process. It results with the high CO2 price, when purchasing from producer, about 300 zl/ton. This price is quite high, considering current low prices of natural gas. In the paper basic aspects of CO2 acquisition from CO2 producers, exhaust gases treatment plants or plasma gasification methods will be presented.
Źródło:
AGH Drilling, Oil, Gas; 2016, 33, 1; 11-22
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aluminium foam testing for impact energy absorption aims
Autorzy:
Niezgoda, T.
Miedzińska, D.
Powiązania:
https://bibliotekanauki.pl/articles/245628.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
aluminium foam
microstructure modelling
open cell foam
closed cell foam
Opis:
Aluminium foams are a new group of materials used for impact energy absorbing elements. They are light (typically 10-25% of the density of the metal they are made of) and stiff, and are frequently proposed as a light weight structural material. That is why they often are applied in automotive and transport industry solutions, for example as parts of bumpers. The methods of numerical modelling for open and closed cell aluminium foams are presented in the paper as well as closed and open cellfoam microstructure model. The numerical models of foam ideal microstructures created with shell finite elements are shown. The models were developed on the basis of Kefain tetrakaidecahedrons - structures consisting of six squares and eight hexagons. In the case of closed cell foams, the polyhedron with full walls was adopted. In the case of open cell foams the circle wholes were removed from polyhedron surfaces. Then the numerical analysis of a created models compressive test was carried out with the usage of LS Dyna computer code. The nonlinear procedures were applied. The results were analyzed in the scope of energy absorbing properties of aluminium foams.
Źródło:
Journal of KONES; 2009, 16, 3; 283-289
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical calculations of RVE dimensions for two-phase material
Autorzy:
Miedzińska, D.
Niezgoda, T.
Powiązania:
https://bibliotekanauki.pl/articles/242298.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
microstructure
two-phase material
metal-ceramic composite
RVE
Opis:
A representative volume element (RVE) is a statistical representation of typical material properties. It should contain enough information on the microstructure thereby be sufficiently smaller than the macroscopic structural dimensions. The paper deals with the numerical calculations of the dimensions of the RVE for a two-phase material microstructure. Two and three dimensional models are taken into consideration. The structure of the samples are developed on the base of randomization of elements belonging to one of the phases. The phases volume share is 50/50%. The following series of the models are analyzed: from 10 x 10 to 100 x 100 elements for 2D samples and from 10 x 10 x 10 to 100 x 100 x 100 elements for 3D samples. The element characteristic dimension is 10 jm. The elastic behavior of the base materials (magnesium and alumina) is taken into account. The quasi-static compression tests of the developed structures are carried out with the use of LS-DYNA computer code. The results are presented as the equivalent Young modulus values and compared to the calculations based on the rule of mixtures. The stabilization of the achieved results allows to assess the dimensions of the RVE for two-phase material with random distribution.
Źródło:
Journal of KONES; 2011, 18, 2; 303-310
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carbon dioxide geosequestration method coupled with shale gas recovery
Autorzy:
Niezgoda, T.
Małek, E.
Miedzińska, D.
Powiązania:
https://bibliotekanauki.pl/articles/298651.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
shale gas
carbon dioxide
geosequestration
Opis:
Shale gas in the United States over the past decade, and interest has spread to potential gas shales in Canada, Europe, Asia, and Australia. One analyst expects shale gas to supply as much as half the natural gas production in North America by 2020. Carbon dioxide capture and storage (CCS) is a set of technologies for the capture of CO2 from its anthropogenic point sources, its transport to a storage location, and its geosequestration. This is only one, though very important, option in a portfolio of actions to fight the increase of atmospheric CO2 concentration and to mitigate climate change, while at the same time allowing for the continued use of fossil fuels. Deployment of CCS technologies is expected to be limited in the next 5-10 years, but to contribute significantly to the reduction of CO2 emissions 20 years from now. Capture of CO2 using existing separation techniques can be applied to large point sources, i.e. power plants or industrial plants; CO2 can be easily transported over large distances using pipelines and ships; finally CO2 can be permanently stored in suitable deep geological formations, namely deep saline aquifers, oil or gas reservoirs, and unmineable coal seams, or it can be fixed in carbonates. The paper deals with the innovative method of carbon dioxide storage coupled with gas shale fracturing and methane recovery developed in the Military University of Technology. It allows to effectively mine the shale gas and to store carbon dioxide in shale rock. It must be noticed that CO2 pollution is a very important problem in Poland, because of European Union CO2 limits. Also carbon dioxide thermodynamic process of decompression numerical calculation, which simulates the injection of the cold liquid gas into the shale formation (high temperature and pressure conditions) and its influence on shale rock fracturing as well as initial experimental verification of the method was presented in the paper.
Źródło:
AGH Drilling, Oil, Gas; 2013, 30, 1; 161-167
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of coal structure in the aspect of gas content
Autorzy:
Niezgoda, T.
Miedzińska, D.
Małek, E.
Powiązania:
https://bibliotekanauki.pl/articles/298731.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
carbon dioxide
methane
porosity of coal
Opis:
The problem of methane existence in coal beds has been known for many years. It was and still is a danger to coalminers. The aim of the research presented in the paper is to show and assess the porosity structure (especially micro and nanoporosity) in accordance to the dimensions of carbon dioxide particle. The characteristic surface morphology of the sample and the disclosure of carbon porous structure was obtain using the scanning electron microscope (SEM). The presented study of the coal microstructure is a part of the coal demethanation method with the use of liquid CO2, that was proposed by Military University of Technology. Based on the results of laboratory tests may be noted that the analyzed coal has a granular structure. It is also visible that that the structure is stratified, and there is a lot of cracks and free space between grains, which can accumulated methane in coal structure. The nanoporosity of the coal grains was observed during SEM study. The sizes and shapes of pores are miscellaneous. However the dimension of 62-300 nm allow to draw a conclusion, that the nanopores can contain a few particles of CH4 (4 A), which can be released by the CO2 particle (2.54 A). Finally, on the base of presented research it can be concluded that the method of coal demethanation with the use of CO2 can be economically and ecologically effective, and can increase the miners safety.
Źródło:
AGH Drilling, Oil, Gas; 2013, 30, 1; 169-179
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New method of carbon dioxide underground storage coupled with shale gas recovery
Autorzy:
Niezgoda, T.
Miedzińska, D.
Kędzierski, P.
Powiązania:
https://bibliotekanauki.pl/articles/246774.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
shale gas
carbon dioxide
storage system
Opis:
Shale gas is natural gas produced from shale, a type of sedimentary rock. Shale gas has become an increasingly important source of natural gas in the United States over the past decade, and interest has spread to potential gas shales in Canada, Europe, Asia, and Australia. One analyst expects shale gas to supply as much as half the natural gas production in North America by 2020. As of 2010, Poland imports two-thirds of its natural gas from Russia. ConocoPhillips has announced plans to explore for shale gas in Poland, along with Lane energy. The recently made available US Department of Energy report revealed that the largest reserves of shale gas in Europe are in Poland. The authors of the report calculate that Poland has reserves of about 22.45 trillion cubic meters of shale gas, of which 5.30 trillion cubic meters is immediately available for extracting. The most common method of shale gas recovery is hydraulic fracturing - the propagation of fractures in a rock layer caused by the presence of a pressurized fluid. Hydraulic fractures form naturally, as in the case of veins or dikes, and is one means by which gas and petroleum from source rocks may migrate to reservoir rocks. This process is used to release petroleum, natural gas (including shale gas, tight gas and coal seam gas), or other substances for extraction, via a technique called induced hydraulic fracturing. The method is critically assessed by ecologists. The paper deals with new method of gas shale fracturing and gas recovery coupled with carbon dioxide storage. It allows to effectively mine the shale gas and to store carbon dioxide in shale rock. It must be noticed that CO2 pollution is a very important problem in Poland, because of European Union CO2 limits. Also the numerical calculation of carbon dioxide thermodynamical process of decompression process, which simulates the injection of the cold liquid gas into the shale formation (high temperature and pressure conditions) and its influence on shale rock fracturing will be presented.
Źródło:
Journal of KONES; 2012, 19, 3; 327-333
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pianki poliuretanowe - właściwości, zastosowania, recykling
Poliurethane foams - properties, applications, recycling
Autorzy:
Barnat, W.
Miedzińska, D.
Niezgoda, T.
Powiązania:
https://bibliotekanauki.pl/articles/357306.pdf
Data publikacji:
2011
Wydawca:
Politechnika Śląska
Tematy:
pianka poliuretanowa
tworzywa sztuczne
recykling
pouliurethane foam
polymers
recycling
Opis:
Pianka poliuretanowa jest tworzywem sztucznym składającym się z komórek litego poliuretanu, który otacza pęcherzyki gazu. Materiał ten może być sztywny lub podatny na odkształcenia, ale zawsze charakteryzuje się niską gęstością. Pianki najczęściej są produkowane w formie dużych bloków, które ucina się do pożądanych kształtów. Po zakończeniu okresu użytkowania poliuretany mogą być odzyskiwane w celu ponownego użycia lub poddawane recyklingowi chemicznemu. W artykule przedstawione zostały wybrane problemy związane z badaniem, zastosowaniem i w dalszej kolejności recyklingiem pian polimerowych.
Polyurethane foam refers to a number of different types of foam consisting of polymers made of molecular chains bound together by urethane links. It can be flexible or rigid, but has a low density. Flexible polyurethane is made in blocks and then cut to its desired shape. At the end of their service life, polyurethanes can be sent for reuse (for example, rebonding) or chemical recycling, or can be incinerated for energy recovery. The chosen problems connected with research, implementations and recycling of polyurethane foams were presented.
Źródło:
Archiwum Gospodarki Odpadami i Ochrony Środowiska; 2011, 13, 4; 13-17
1733-4381
Pojawia się w:
Archiwum Gospodarki Odpadami i Ochrony Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energia z głębokich pokładów gorących suchych skał (HDR) do poprawy bezpieczeństwa infrastruktury krytycznej Polski
Autorzy:
Niezgoda, T.
Miedzińska, D.
Sławiński, G.
Powiązania:
https://bibliotekanauki.pl/articles/111049.pdf
Data publikacji:
2018
Wydawca:
Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:
bezpieczeństwo energetyczne
energia
wydobycie ciepła
skały
infrastruktura krytyczna
energy security
energy
heat extraction
rocks
critical infrastructure
Opis:
W artykule przedstawiono zarys technologii wydobycia ciepła z głębokich pokładów gorących suchych skał (HDR – hot dry rocks), możliwości jej implementacji na terenie Polski oraz jej zalety w aspekcie zastosowania do poprawy bezpieczeństwa infrastruktury krytycznej, jak również poprawy bezpieczeństwa energetycznego Polski.
In the paper the scheme of technology of heat recovery from deep beds of hot dry rocks (HDR) and the possibilities of its applications in Poland were presented. Also the advantages of the HDR technology implementation in accordance to critical infrastructure safety improvement as well as for Poland energetic safety increase were shown.
Źródło:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych; 2018, 3-4; 65-69
2450-1859
2450-8721
Pojawia się w:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FEM analysis of proppant sticking in rock cracks
Analiza MES wciskania proppantu w pęknięcie skalne
Autorzy:
Kwietniewski, M.
Miedzińska, D.
Niezgoda, T.
Powiązania:
https://bibliotekanauki.pl/articles/231026.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
analiza MES
proppant
skała łupkowa
pęknięcie
szczelinowanie
kontakt
Newmark
FEM analysis
shale rock
crack
fracturing
contact
Opis:
The problem of effective gas extraction from Polish shale rocks is an interesting research subject for scientists. A properly selected proppant, which protects cracks from closing during the fracturing process, inestimably contributes to an increase of extraction. Grains of proppant are transported along with a fracturing medium to reach the deepest regions of the crack. The proper support of the crack provides an easy flow of gas, therefore it is important in terms of extraction efficiency. This paper shows the interactions of a proppant grain with the crack surface in shale rock. FEM analysis was conducted to observe the stress region, which is generated as a result of pressing the grain into the crack surface. A model of a sphere which was pressed into the rock model with constant velocity was applied. The received results of stress depend on material properties and a range of proppant grain pressing.
Terytorium Polski od kilku lat jest obiektem wzmożonych badań mających na celu opracowanie opłacalnej technologii wydobycia gazu z łupków. Polskie skały łupkowe różnią się pod względem fizycznym i chemicznym od tych występujących w Ameryce Północnej, są rozlokowane również na innej głębokości. Inna budowa skały stawia zatem nowe wyzwania dla wiertnictwa otworowego. Procesy szczelinowania zachodzą w nieco inny sposób, zatem konieczne jest opracowanie nowej technologii wydobycia. Jednym z ważniejszych aspektów tych badań jest dokładna analiza zachowania się skały obciążonej ciśnieniem szczelinowania. Do rozważenia jest tu mechanizm powstawania i propagacji pęknięcia oraz optymalny sposób podparcia szczeliny po zabiegu szczelinowania. Tę funkcję mają pełnić proppanty, które dostają się do złoża wraz z czynnikiem szczelinującym. Ziarenka, najczęściej ceramiczne o dużej twardości mają za zadanie zaklinować się w skale, aby utworzyć maksymalne rozwarcie szczeliny. Oczywiście, przy ogromnych naprężeniach wewnętrznych górotworu nastepuje wgniatanie ziaren w powierzchnię skały, co powoduje zmniejszenie przekroju poprzecznego szczeliny, a w skrajnych przypadkach może prowadzić do całkowitego zamknięcia szczeliny. Do analizy MES opracowano model geometryczny. Przyjęto, że model skały to czwarta część walca ze szczeliną w środkowej częćci o promieniu 1 mm. Wygenerowano model skały łupkowej o promieniu 8 mm oraz długości 10 mm. Analogicznie do modelu skały, przyjęto ziarenko proppantu jako 1/4 kuli. Dyskretyzację modelu przeprowadzono w oprogramowaniu LS – PrePost za pomocą elementów ośmiowęzłowych. Utworzony model składa się z 29554 elementów oraz 60696 węzłów.
Źródło:
Archives of Civil Engineering; 2018, 64, 2; 55-65
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Various approaches to magnetorheological elastomers structures FE modelling
Autorzy:
Miedzińska, D.
Niezgoda, T.
Boczkowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/245985.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
magnetorheological elastomer
FE modelling
multistage modelling
microscale
macro scale
Opis:
Magnetorheological elastomers (MREs) are the materials with rheological properties which can be rapidly and reversibly changed in a continuous way by the applied magnetic field. They are the solid analogues of magnetorheological fluids (MRFs) consisting of magnetically permeable particles (such as iron) added to a viscoelastic polymeric material prior to crosslinking. In the paper different approaches to numerical modelling of the magnetorheological elastomers (MREs) structures are presented. The methods of the MRE micro- and macrostructural FE simulations are taken into consideration. The first approach is connected with the microstructural behaviour of the iron particles situated in the pure elastomer and subjected to the mechanical or magnetic load. The second approach is related to global material properties consideration and macrostructural behaviour modelling. The paper shows that there are many ways of such new materials structure behaviour modelling. All the FE analyses always need to be verified with the experiments as well as for macro- and micro scale material reactions, properties and phenomena describing.
Źródło:
Journal of KONES; 2010, 17, 1; 255-260
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on coal microstructure for porosity levels assessment
Autorzy:
Miedzińska, D.
Niezgoda, T.
Małek, E.
Zasada, D.
Powiązania:
https://bibliotekanauki.pl/articles/201272.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
coal
methane
carbon dioxide
coalbed methane
Opis:
The problem of methane existence in coal beds has been known for many years. It was and still it is a danger to coalminers. The aim of the research, presented in the paper, is to show and assess the porosity structure (especially micro and nanoporosity) in accordance to the dimensions of carbon dioxide particle. The characteristic surface morphology of the sample and the disclosure of the carbon porous structure have been obtained using the scanning electron microscope (SEM). The presented study of the coal microstructure is a part of the coal demethanation method with the use of liquid CO2, that has been proposed by the Military University of Technology.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 2; 499-505
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Overview of issues related to mixing CO2 and proppant in the method of gas extraction from shale rocks
Autorzy:
Niezgoda, T.
Miedzińska, D.
Stanisławek, S.
Kwietniewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/298655.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
carbon dioxide
proppant
gas
shale
Opis:
To increase the efficiency of fracturing process, proppant materials are added to fracking fluid. This admixture allows to keep developed fracks, that tend to lock, opened. The aim of this overview is to present methods of carbon dioxide and proppant mixing. The most often applied methods are as follows: special medium admixing, direct proppant with CO2 mixing. Liquid CO2 and proppant blenders are currently commercially used, but are not very popular.
Źródło:
AGH Drilling, Oil, Gas; 2016, 33, 2; 307-313
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Validation studies of the simplified model of the missile with cumulative head
Autorzy:
Sybilski, K.
Panowicz, R.
Kołodziejczyk, D.
Niezgoda, T.
Powiązania:
https://bibliotekanauki.pl/articles/246839.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
RPG
simulation
FEM analysis
safety
slat armour
rod armour
Opis:
During ongoing conflicts around the world, some of the most dangerous threats are rocket-propelled grenades. They are light, easy to use and cheap, and their penetration reaches 900 mm of armoured RHA steel. Therefore, in many experimental and numerical laboratories there are researches of different, in aspect of shape, dimensions and used material, types of rod armours protecting against such a threat carried out. This kind of research must be confirmed in the last part of design by appropriate field tests. However, at the beginning of the design process, it is important to find a fast method of testing the developed solutions in a manner, which allows us to observe and measure as many process parameters as possible. One of such tests is research with the use of simplified models built in an appropriate scale. Small dimensions and simple construction result in the fact that the cost of manufacturing of models is much lower, and time is shorter. Tests on the simplified models are also possible to be carried out in laboratory conditions, what reduces the costs and makes the measurements of physical properties easier. The article describes experimental investigations of the impact of a simplified missile with a shape charge jet head model into a thick plate and steel rods. The construction of a missile, the used equipment and apparatus as well as the proceedings of the experiment are presented. The paper provides information about the structure of FE model and both initial and boundary conditions of the examined system. The results of numerical analysis are presented and compared with the results from experimental tests.
Źródło:
Journal of KONES; 2012, 19, 3; 415-420
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of influence of temperature on wellbore tubing dimensions
Autorzy:
Kwietniewski, M.
Miedzińska, D.
Niezgoda, T.
Małek, E.
Powiązania:
https://bibliotekanauki.pl/articles/241587.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
wellbore
tubing
heat
thermal extension
pipe
steel P110
thermal analyses
finite element method
Opis:
The construction of exploitation wellbore is complex, it consists of several columns of pipelines which perform different tasks. It is very important to preclude flow of reservoir fluid between wellbore and ground. Tubing is a kind of a pipeline which is very important element of oil and gas wellbore construction. It allows to transport fracturing medium between wellbore station and underground deposit. Manufacture quality and correct mounting of tubing in the wellbore are the key for effective exploitation. However, during work those pipes are subjected to changeable loads which results in temperature value changes for example. That temperature variations can be caused by cold medium transport inside the pipe. In the paper, analyses of influence of temperature value changes on the tubing shrinkage were presented. Numerical analyses of section of pipe vertically located in the wellbore and loaded with changeable temperature were carried out. The calculations were made with the use of coupled structural and thermal analyses. Received results of tubing shrinkage for fragment of pipe were adapted to the column of pipes of 3000 m length. Results of numerical analyses were verified with the analytical calculations. Material of tubing was assumed as steel P110 which is often applied in the wellbore construction.
Źródło:
Journal of KONES; 2016, 23, 4; 269-273
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza procesu przebijania płyty przez małogabarytowy element cylindryczny
Analysis of Process of Plate Piercing by Small Dimension Cylindrical Element
Autorzy:
Panowicz, R.
Kołodziejczyk, D.
Sybilski, K.
Niezgoda, T.
Powiązania:
https://bibliotekanauki.pl/articles/403921.pdf
Data publikacji:
2014
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
przebijalność
analiza numeryczna
dynamika
metoda elementów skończonych
piercing power
numerical analysis
dynamics
finite element method
Opis:
W artykule przedstawiono wstępną weryfikację oddziaływania małogabarytowego elementu cylindrycznego z przeszkodą w postaci tarczy metalowej o grubości 2,5 mm. Rozważono uderzenia z różnymi prędkościami (200, 400 i 800 m/s) oraz kątami uderzenia (30, 45, 60 i 90°), dla dwóch rodzajów materiałów: stopu aluminium PA7 oraz taśmy miedzianej. Na podstawie tych wyników określono obszar zmian, które powstały w materiale na skutek uderzenia. Trójwymiarowy model numeryczny został wykonany w systemie HyperMesh [1], a do analiz zjawisk szybkozmiennych użyto nieliniowej metody elementów skończonych zaimplementowanej w programie LS-Dyna [2]. Wykorzystanie analiz numerycznych umożliwiło śledzenie niemożliwych do zarejestrowania metodami eksperymentalnymi, rozważanych w poniższej pracy, zjawisk dynamicznych. Wykorzystując oprogramowanie LS-Dyna, można było obserwować propagację zniszczenia w kolejnych krokach czasowych, jak również rozkład naprężeń w materiale. Przeprowadzone w pracy badania pozwoliły na dokładniejsze poznanie fizyki zjawiska procesu przebijania.
The article presents an initial verification of interaction of a small dimension cylindrical element with an obstacle in the form of a 2.5 mm thick metal shield. There were considered impacts at different velocities (200 , 400 and 800 m/s) and different impact angles (30, 45, 60 and 90°) for two different types of materials: aluminium alloy PA7 and copper tape. Based on these results, there was determined the area of changes which were formed in the material as a result of the impact. A three-dimensional numerical model was developed in HyperMesh system [1] and analyses of high frequency phenomena were performed with the use of a nonlinear finite element method included in LD-Dyna software [2]. Implementation of numerical analyses would enable the investigation of the considered in the present work dynamic phenomena impossible to be recorded with experimental methods. Application of LS-Dyna enabled both the investigation of damages propagation in the subsequent time steps and stress distribution in the material. The tests carried out in the present work allowed more accurate knowledge of physics of a piercing process phenomenon.
Źródło:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2014, 5, 2 (16); 77-90
2081-5891
Pojawia się w:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 18

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