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    Wyświetlanie 1-14 z 14
    Tytuł:
    Experiments and numerical simulations of Lueders bands and Portevin–Le Chatelier effect in aluminium alloy AW5083
    Autorzy:
    Mucha, M.
    Rose, L.
    Wcisło, B.
    Menzel, A.
    Pamin, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/38697098.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    Lueders bands
    PLC effect
    aluminum alloy
    large strains
    thermo-viscoplasticity
    Opis:
    This work is focused on the modelling of experimental behaviour of a bone-shape sample made of aluminium alloy AW5083 under tension. This behaviour involves propagating instabilities, namely Lueders bands and the Portevin–Le Chatelier effect. A series of experiments was performed at room temperature for three loading rates, showing the instabilities and failure. In the paper a large strain thermovisco-plasticity model is proposed and used for finite element simulations. This model contains initial softening and a hardening function based on the Estrin–McCormick concept to represent serrations and travelling shear bands. The issues of instability sources and regularisation are considered. The predictive capabilities of the model are examined. The proposed models are able to reproduce both Lueders bands and the PLC effect. Simulation results show good agreement with experiments regarding force–displacement diagrams and temperature levels.
    Źródło:
    Archives of Mechanics; 2023, 75, 3; 301-336
    0373-2029
    Pojawia się w:
    Archives of Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of Lueders bands using regularized large strain elasto-plasticity
    Autorzy:
    Mucha, M.
    Wcisło, B.
    Pamin, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/38614097.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    Lueders bands
    viscoplasticity
    gradient plasticity
    thermo-mechanical coupling
    parametric study
    Opis:
    This paper deals with the numerical simulation of an instability phenomenon called Lueders bands with two regularized material models: viscoplasticity and gradient-enhanced plasticity. The models are based on large strain kinematics and temperature-dependence is incorporated. The Huber–Mises–Hencky yield condition and multi-branch hardening are employed. After a brief presentation of the constitutive description, test computations are performed using AceGen and AceFEM symbolic packages for Wolfram Mathematica. The first benchmark is a rectangular tensile plate in plane strain isothermal conditions. For the viscoplastic model, simulation results for different values of viscosity, loading duration and enforced displacement are compared. For the gradient model different internal lengths are used. Mesh sensitivity of the results and the influence of boundary conditions are also examined. Next to the Lueders-type response to a softening-hardening yield strength function, an additional softening stage leading to failure is also considered. The second example concerns a bone-shape sample under tension, for which, next to mesh sensitivity and the effect of regularization, the influence of heat conduction on simulation results is evaluated.
    Źródło:
    Archives of Mechanics; 2021, 73, 1; 83-117
    0373-2029
    Pojawia się w:
    Archives of Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determining the effect of oil after frying fish for the production of biofuels with a fractional composition of FAME
    Autorzy:
    Wcisło, G.
    Pracuch, B.
    Tomyuk, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/411347.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    biodiesel
    FAME – Fatty Acid Methyl Esters
    diesel engine
    fractional composition
    temperature distillation
    Opis:
    The aim of the study was to determine the impact of the fish frying process on the distillation properties of FAME and its mixtures with diesel fuel. The fish was fried at 160°C for 2 hours. Frying one serving lasted 6 minutes. The frying oil was a mixture of 50% (v/v) rapeseed oil and 50% (v/v) sunflower oil. The study showed that FAME biodiesel made from unused (pure) oil has similar distillation properties. The largest differences were observed for distillation temperatures of 85% and 100% and the final temperature of the distillation process. This may indicate a slightly lower purity of FAME produced from used cooking oil. In such a biofuel there may be more less volatile mono- and diglycerides or other chemicals that, e.g. after frying, remain in oil. It must be said, however, that they are not solid particles because they have been separated from the oil by filtration.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2019, 8, 3; 37-41
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determining the effect of the addition of temperature on the rheological properties of biofuels FAME and RME
    Autorzy:
    Wcisło, G.
    Pracuch, B.
    Łagowski, P.
    Kurczyński, D.
    Leśniak, A.
    Tomyuk, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/411023.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    Biodiesel
    FAME - Fatty Acid Methyl Esters
    RME - Rapeseed Methyl Esters
    diesel engine
    dynamic viscosity
    shearing rate
    biofuel mix tur
    Opis:
    The aim of the study was to compare the impact of dynamic viscosity of two biofuels. One was a mixture of 50% (m / m) SBME and 50% (m / m) RME of own production. The mixture was conventionally called FAME. The second biofuel was commercial RME from a gas station. Dynamic viscosity as a function of temperature from -20 to 50oC was tested. The main device used at the measuring stand was ReolabQC rheometer manufactured by a German Anton Paar GmbH company. Dynamic viscosity especially grew rapidly after cooling biofuels to temperatures below -5°C. Dynamic viscosity FAME biofuels produced from pure vegetable oil (soybean oil and rapeseed oil) in a temperature range of 50 to -20°C has a value of c.a. 9 to 53[mPa∙s]. Dynamic viscosity of Biofuel FAME produced from mixtures of vegetable oils it was on average lower by about 1 to 8 [mPa∙s] of RME shopping from a gas station.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2019, 8, 4; 3-7
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of various types of soybean cake to soy straw briquettes on the heat of briquette combustion
    Autorzy:
    Wcisło, G.
    Pracuch, B.
    Łagowski, P.
    Kurczyński, D.
    Tomyuk, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/411169.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    briquette
    soyben stalk
    press cake
    heat of combustion
    Opis:
    The paper presents results of research demonstrating the effects on heat of combustion of adding press cake from three varieties of soyben Erica, Mavka and Sirelia to soyben stalk based briquette. The conducted research shows that heat of combustion of soyben stalk was 15.2 [MJ∙kg-1], much lower than the heat of combustion of press cake from four. Press cake heat of combustion from the most effective Erica soyben variety was 23.4 [MJ∙kg-1], or 54% (w/w) more than that of rape stalk. Press cake heat of combustion from the least effective soyben variety was 19.8 [MJ∙kg1], or 30% (w/w) more than that of soyben stalk. Adding 20% (w/w) of press cake during briquette production Erica varieties resulted in an increase in heat of combustion by approximately 10,5; and a 40% (w/w) addition resulted in a further increase of approximately 20,4%, a 60% (w/w) addition of press cake increased heat of combustion by approximately 31,6 whereas an 80% (w/w) press cake content increased heat of combustion by more than 38,8%.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2019, 8, 3; 23-26
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Angle of injection impact on the combustion proces in a compression-ignition engine
    Autorzy:
    Łagowski, P.
    Kurczyński, D.
    Wcisło, G.
    Pracuch, B.
    Tomyuk, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/411209.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    Perkins AD3 152UR engine
    heat emission
    Opis:
    The article presents the impact of hydrocarbon fuel angle of injection on heat emission characteristics in a compression - ignition AD3.152 engine. The angle of injectionhas a significant impact on the primary engine operating parameters and combustion process indicators, which include the proportion of combustion which occurs according to kinetic and diffusion models, heat emission rate and the combustion process duration. The characteristics describing emission of a relative heat quantity were determined on the basis of an analysis of actual, indicator diagrams averaged over 100 runs, under the assumption that the combustion process ends by the time the exhaust valve opens. During the test, the engine operated according to an external speed characteristic. Tests were carried out for three fuel angles of injection: 13, 17 and 21 crankshaft rotation degrees.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2018, 7, 4; 29-36
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the SME run Perkins 1104D-44TA engine on the power and torque as well as unitary and hourly fuelconsumption
    Autorzy:
    Łagowski, P.
    Kurczyński, D.
    Wcisło, G.
    Pracuch, B.
    Leśniak, A.
    Tomyuk, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/410954.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    combustion engine
    biofuels
    methyl esters of sunflower oil
    external speed characteristics
    Opis:
    The article presents the results of tests determining the impact of using sunflower oil methyl esters on power and torque as well as unitary and hourly fuel consumption of the Perkins 1104D-44TA engine. Biofuels were produced in the Fuel and Energy Laboratory belonging to the Maopolskie Centrum Energii Odnawialnej (Małopolskie Center for Renewable Energy Sources), while analyzes of the selected fuel parameters were performed both in the above-mentioned laboratory and in the Liquid Biofuels Laboratory at the University of Agriculture in Krakow. Engine tests were carried out on the engine test stand at the Kielce University of Technology. During the tests, the engine worked according to the external speed characteristic. The results of the tests have shown that the engine supplied with the SME achieves slightly lower values of both power and torque than in the case of commercial fuel oil type Ekodiesel Ultra from the ORLEN S.A company. There was also an increase, especially in the case of higher unitary fuel consumption. Hourly fuel consumption was higher when supplied with SME in relation to the diesel fuel supply, although not as much as unitary consumption. The increase in SME consumption at the engine supply can be explained by the lower fuel value of SME, which contains oxygen in its structure.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2018, 7, 4; 49-52
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influenceof Perkins 1104D-44TA motor powered with SME supply on the CO, NOx, THC and O2 emissions
    Autorzy:
    Wcisło, G.
    Kurczyński, D.
    Łagowski, P.
    Pracuch, B.
    Leśniak, A.
    Tomyuk, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/411145.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    combustion engine
    biofuels
    methyl esters of sunflower oil SME
    external speed characteristics
    Opis:
    The paper presents the results of research on the impact of Perkins 1104D-44TA engine powered with sunflower oil methyl esters and, for comparison, with diesel fuel, in terms of emission of CO, THC, NOx and O2. The tests were carried out on the engine test stand. During the tests, the engine worked according to the external speed characteristics in the range from 1000 to 2200 rpm. The esters used for powering the tested engine were produced using the GW 200 reactor designed and made by Grzegorz Wcisło, one of the co-authors of the paper. The results of the tests carried out showed a decrease in the concentration of carbon monoxide in the exhaust gases, hydrocarbons when powering the engine with sunflower oil esters in relation to powering the engine with diesel fuel. At the same time, the concentration of nitrogen oxides and oxygen in the exhaust gases increased. The reduction of THC and CO emissions is the result of better combustion and afterburning of fuel. However, the increase in the amount of oxygen in the exhaust gases results from the fact that in the biofuel structure there is oxygen which is used in combustion and reduces the oxygen demand from the atmosphere. On the other hand, the increase in NOx emissions is the result of a higher combustion temperature than when the engine is powered by diesel fuel.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2018, 7, 4; 49-52
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ecological indicators for the Perkins 1104D-44TA engine fuelled by sunflower oil methyl esters operating according to load characteristics
    Autorzy:
    Kurczyński, D.
    Łagowski, P.
    Wcisło, G.
    Pracuch, B.
    Tomyuk, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/411432.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    compression-ignition engine
    engine ecological indicators
    load characteristics
    harmful emission contents
    sunflower oil methyl esters (SME)
    FAME Biodiesel
    Opis:
    Fuels constitute one of the research areas within the scope of piston internal combustion engines. The works encompass both conventional as well as alternative fuels. Fuels are sought which will contribute to a reduction in the negative impact of transport on the natural environment and humans. These may be fuels obtained from organic raw materials of agricultural (most often) or forest origin. When it comes to compression-ignition engines, Biodiesel B100 type biofuels can be used to fuel them, which most often constitute a long chain fatty acid ester, made from plant oils or animal fats. The publication presents ecological indicator test results for a compression – ignition engine fuelled by SME Biodiesel, or sunflower oil methyl esters and commercially available diesel as a benchmark. During the tests, the engine operated according to load characteristics at two different crankshaft rotational speeds. A sunflower oil ethyl ester fuelled engine returned beneficial values for most of the tested ecological indicators as compared to a diesel fuelled engine. Concentrations of substances such as CO, CO2, unburned hydrocarbons (THC), particulate matter (PM) were lower in the engine emissions, exhaust smoke levels were also reduced. Only nitrogen oxides (ONx) increased.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2017, 6, 4; 71-80
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    External speed characteristic for the Perkins 1104D-44TA engine fuelled by sunflower oil methyl esters
    Autorzy:
    Kurczyński, D.
    Łagowski, P.
    Wcisło, G.
    Pracuch, B.
    Leśniak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/411009.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    external characteristic harmful emission contents
    sunflower oil methyl esters (SME)
    FAME Biodiesel
    Opis:
    The publication presents test results for a Perkins 1104D - 44TA engine powered by SME sunflower oil fatty acids methyl esters. The SME biofuel was manufactured in-house using a GW-200 reactor at MCOŹE "BioEnergia". The test was carried out at an engine test stand at Kielce University of Technology's Heat Engine Laboratory. During the test the engine operated according to an external speed characteristic. The tests aimed to determine the impact of using an SME type biofuel to power the engine on the engine's primary performance indicator values. A slight decrease to the brake horsepower and torque of the tested engine powered by sunflower oil esters as compared to diesel was recorded. Fuel consumption of the engine powered by plant origin fuel also increased. No operating problems were experienced associated with powering the engine using sunflower oil esters during the tests.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2017, 6, 4; 111-120
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of the distillation parameters of the milesPLUS® diesel fuel comprising a bio-component in the form of methyl esters of corn oil
    Wyznaczenie parametrów destylacyjnych oleju napędowego milesPLUS® diesel zawierającego biokomponent w postaci estrów metylowych oleju kukurydzianego
    Autorzy:
    Wcislo, G.
    Pracuch, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/792995.pdf
    Data publikacji:
    2016
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    diesel fuel
    biocomponent
    methyl ester
    corn oil
    biodiesel fuel
    fractional composition
    liquid fuel
    Źródło:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2016, 16, 4
    1641-7739
    Pojawia się w:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of the rheological properties of biofuels containing CME biocomponent
    Określenie własności reologicznych biopaliw zawierających biokomponent CME
    Autorzy:
    Wcisło, G.
    Pracuch, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/133521.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    diesel engine ZS
    biodiesel
    biofuel
    CME
    Corn Methyl Esters
    corn oil
    dynamic viscosity
    silnik o zapłonie samoczynnym ZS
    biopaliwo
    estry metylowe oleju kukurydzianego
    olej kukurydziany
    lepkość dynamiczna
    Opis:
    Similarly to diesel oil (B7), Biodiesla B100 CME dynamic viscosity at positive temperatures in principle increases with decreasing temperature. Having exceeded 263K, it begins to increase rapidly. The dynamic viscosity for B100 CME at 253 K was 204 mPa·s, for B75 CME – 118 mPa·s, for B50 CME – 77 mPa·s and for B20 CME – 42 mPa·s. The study has shown that B100 CME cannot be used in practice as a pure fuel without a package of viscosity-lowering additives. At the same time, the viscosity values for B5 and B20 biofuels, in particular at positive temperatures, are close to the viscosity of diesel fuel. Under such conditions one can safely use B7 and B20 biofuels in compression-ignition engines, even in those with a state-of-the-art injection apparatus.
    Lepkość dynamiczna biodiesla B100 CME w zakresie dodatnich temperatur w zasadzie rośnie wraz z obniżaniem temperatury, podobnie jak oleju napędowego (B7). Natomiast po przekroczeniu 263 K zaczyna gwałtownie rosnąć. Lepkość dynamiczna w temperaturze 253 K – B100 CME wynosiła 204 mPa·s, B75 CME – 118 mPa·s, B50 CME – 77 mPa·s, natomiast B20 CME – 42 mPa·s. Przeprowadzone badania pokazały, że w praktyce B100 CME nie może być stosowane jako samoistne paliwo, bez zastosowania pakietu dodatków obniżających lepkość. Natomiast dla biopaliw typu B7 i B20 wartości lepkości szczególnie w zakresie dodatnich temperatur są zbliżone do lepkości oleju napędowego. W takich warunkach bez obaw można używać B7 i B20 do zasilania silników z zapłonem samoczynnych nawet posiadających nowoczesną aparaturę wtryskową.
    Źródło:
    Combustion Engines; 2015, 54, 3; 1088-1093
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of the impact of the type of camelina oil used for production of biofuels on the fractional composition of CSME
    Określenie wpływu rodzaju użytego oleju rzepakowego do produkcji biopaliw na skład frakcyjny CSME
    Autorzy:
    Wcislo, G.
    Pracuch, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/792893.pdf
    Data publikacji:
    2014
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    biodiesel production
    biodiesel fuel
    biofuel
    gold of pleasure oil
    diesel engine
    fractional composition
    distillation
    temperature
    Źródło:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2014, 14, 4
    1641-7739
    Pojawia się w:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metoda utylizacji odpadów metalurgicznych
    Method of metallurgical waste scale-utilization
    Autorzy:
    Łędzki, A
    Sanak-Rydlewska, S.
    Tora, B.
    Mazurkiewicz, M.
    Stachura, R.
    Wcisło, Z.
    Klimczyk, A
    Bernasowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1819347.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    zendra powalcownicza
    ciecz ciężka
    odpady metalurgiczne
    Opis:
    The project aims to develop technologies for the production of a sinker for heavy media (used in gravity separation of the minerals) on the basis of metallurgical wastes. Research includes the study of physicochemical properties of waste as a sinker, and the development of technology to modify these properties. The technology will be waste-less. Annual requirements of the sinker is approximately 15 thousand tons, and is met by imports. The product, which will result from the realization and implementation of the project will replace the imported raw material. In the years 1980-1985 prof. Tadeusz Piecuch with his team [1-8] conducted research and developed the technology and logistics of implementation of the mill waste sludge from wet cleaning of exhausts from blast furnace in Kosciuszko Ironworks for making a heavy liquid suspension. Industrial test of possibility of implementation of heavy liquid made from waste was carried out in Piast coal mine in Bierun Nowy from 30.08.1984 to 08.09.1984. An attempt is successful [7].
    Źródło:
    Rocznik Ochrona Środowiska; 2012, Tom 14; 772-789
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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