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Content available remote Numerical investigation of pores statistic distribution influence on porous material mechanical behaviour
100%
Miedzińska D.
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tom Vol. 65, iss. 1
89--95
EN
The aim of the work presented in the paper was to investigate the influence of pores statistic distribution used for porous material idealistic microstructure model generation on modelled material mechanical properties. Three distribution models were used: homogenous, normal and Weibull one. The model idea was based on the observation of SEM visualisation of shale rock structure which is characterized with dual porosity. The proposed models will be useful for mechanical behaviour of such structures prediction.
2
Content available remote Modelowanie numeryczne pian polimerowych ukierunkowane na ich właściwości energochłonne
100%
Miedzińska D.
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2012
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tom R. 17, nr 1
60-64
PL
Piany polimerowe mają właściwości, które pozwalają na stosowanie ich w lekkich elementach konstrukcyjnych oraz systemach pochłaniających energię. W zastosowaniach tych mogą być poddawane obciążeniom wieloosiowym i dlatego konieczne jest określenie kryterium ich niszczenia. W artykule przedstawiono metody modelowania struktur otwartokomórkowych z wykorzystaniem metody elementów skończonych i zaprezentowano wyniki analiz numerycznych badanego materiału z perspektywy ich właściwości energochłonnych.
EN
Polymer foams have the potential for use in lightweight structural components and in energy absorption systems. They may be subjected to multi-axial loads in these applications and thus it is essential to determine the criterion for the failure of foams. The article presents the methods of modeling the open cell foam microstructures with the use of the finite element method and the results of numerical analyses of the researched material with respect to their energy-absorbing capabilities.
3
Content available Research on heat flow in granite sample using thermal imaging camera
51%
Małek E. , Miedzińska D. , Niezgoda T. , Stankiewicz M.
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tom Vol. 23, No. 4
327--333
EN
Research on heat flow in granite sample and sample of aluminium foam with the use of a thermal imaging camera is presented in the paper. Temperature distribution on the surface of the sample as a function of time was obtained on the basis of data from the thermal imaging camera. Thermovision is one of the most universal technology, which is applied for detection of infrared radiation. This technique allows observing and record infrared radiation emitted by objects located in the surrounding environment. This technology allows obtaining, in a short time, temperature distribution on the surface of the sample. The thermograms (pictures showing on the surface of the object) are types of photos showing temperature distribution on the tested object surface which is achieved on the base of a specified range of electromagnetic radiation. Accurate measurement of the temperature distribution on the heated granite sample surface was obtained using a thermal imaging camera FLIR SC 6000. Thermal imaging camera was connected to the computer equipped with control software FLIR ResearchIR Max. Heat source was applied in the experiment as a cast iron hotplate with high efficiency heating, gradual control and 1500W power. Obtained results showed regular temperature distribution over the surface of researched sample.
4
Content available Analysis of influence of temperature on wellbore tubing dimensions
51%
Kwietniewski M. , Miedzińska D. , Niezgoda T. , Małek E.
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tom Vol. 23, No. 4
269--273
EN
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.
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Content available Study on carbon dioxide thermodynamic behavior for the purpose of shale rock fracturing
45%
Niezgoda T. , Miedzińska D. , Małek E. , Kędzierski P. , Sławiński G.
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tom Vol. 61, nr 3
605--612
EN
The possibility of using CO2 to fracturing a shale rock has been presented in the paper. The described innovative method which allows for the efficient extraction of shale gas and carbon dioxide storage in a shale rock was developed in Department of Mechanics and Applied Computer Science at the Military University of Technology, Warsaw, Poland. Firstly, the method was verified on the base of analytical and experimental research. In the next stage of the method verification carbon dioxide thermodynamic behavior was studied. The growth in pressure of drop of CO2 heated in a closed volume was numerically tested. The research confirmed the efficiency of the use of carbon dioxide as a medium for fracturing of rocks. The usage of liquid CO2 can be alternative for hydraulic fracturing and is safe for the environment.
6
Content available Experimental research on influence of gas impact on thermal and mechanical propertiesof material covered with titanium silicide coating
38%
Miedzińska D. , Zasada D. , Gieleta R. , Małek E. , Stankiewicz M. , Marszałek K.
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nr 2
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