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Tytuł:
Incremental method of Young modulus updating procedure in topology optimization
Autorzy:
Kutylowski, R.
Rasiak, B.
Powiązania:
https://bibliotekanauki.pl/articles/202344.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
topology optimization
minimum compliance
new incremental method of updating Young modulus
Opis:
This paper presents a new Young modulus updating procedure as an extension to the SIMP method used for topology optimization. In essence, the modified Young modulus updating procedure consists in taking into account in a given optimization step not only the material density from the preceding step, but also the increment in density in the two preceding steps. Thanks to this, it is possible to obtain a solution in cases in which the classic SIMP method failed. The variational approach was adopted and the structure’s strain energy was minimized under constraints imposed on body mass. FEM was used to solve numerical examples. The numerical analysis confirmed the effectiveness of the proposed method, particularly for structures with relatively long spans.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 2; 159-164
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the Young Modulus of Ti-TiAl₃ Metallic Intermetallic Laminate Composites by Nano-Indentation
Autorzy:
Yener, T.
Güler, S.
Siddique, S.
Walther, F.
Zeytin, S.
Powiązania:
https://bibliotekanauki.pl/articles/1398728.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.Tm
61.82.Bg
68.55.Nq
Opis:
Nano-indentation is an important technique to determine the Young modulus of multiphase materials where normal tensile tests are not appropriate. In this work, Ti-TiAl₃ metallic-intermetallic laminate composites have been fabricated successfully in open atmosphere using commercial purity Al and Ti foils with 250 μm and 500 μm initial thicknesses, respectively. Sintering process was performed at 700°C under 2 MPa pressure for 7.5 h. Mechanical properties including the Young modulus were determined after manufacturing. The Young moduli of metallic and intermetallic phases were determined as 89 GPa and 140 GPa, respectively. Microstructure analyses showed that aluminum foil was almost consumed by forming a titanium aluminide intermetallic compound. Titanium aluminides grow up through spherical shaped islands and metallic-intermetallic interface is a wavy form in Ti-Al system. Thus, the final microstructure consists of alternating layers of intermetallic compound and unreacted Ti metal. Microstructure and phase characterizations were performed by scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction. Hardness of test samples was determined as 600 HV for intermetallic zone and 130 HV for metallic zone by the Vickers indentation method.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 604-606
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of process parameters for enhanced mechanical properties of polypropylene ternary nanocomposites
Autorzy:
Ogunleye, O O
Salawudeen, T O
Suleyman, M A
Faridah, Y
Powiązania:
https://bibliotekanauki.pl/articles/102420.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
MWCNT
PPTN
tensile strength
Young's modulus
Opis:
Preparation of Polypropylene ternary nanocomposites (PPTN) was accomplished by blending multiwall carbon nanotube (MWCNT) in polypropylene/clay binary system using a melt intercalation method. The effects of MWCNT loadings (A), melting temperature (B) and mixing speed (C) were investigated and optimized using central composite design. The analysis of the fitted cubic model clearly indicated that A and B were the main factors influencing the tensile properties at a fixed value of C. However, the analysis of variance showed that the interactions between the process parameters, such as; AB, AC, AB2, A2B and ABC, were highly significant on both tensile strength and Young’s modulus enhancement, while no interaction is significant in all models considered for elongation. The established optimal conditions gave 0.17%, 165 °C, and 120 rpm for A, B and C, respectively. These conditions yielded a percentage increase of 57 and 63% for tensile strength and Young’s modulus respectively compared to the virgin Polypropylene used.
Źródło:
Advances in Science and Technology. Research Journal; 2015, 9, 25; 27-33
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metody wyznaczania wartości statycznego modułu Younga materiałów elastomerowych
Methods for estimation of static Youngs modulus for elastomeric materials
Autorzy:
Bednarz, J.
Bieleń, P.
Powiązania:
https://bibliotekanauki.pl/articles/315639.pdf
Data publikacji:
2017
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
elastomer
moduł Younga
wibroizolacja
Young modulus
vibroisolation
Opis:
Prawidłowy dobór materiałów elastomerowych mogących mieć zastosowanie w systemach wibroizolacji wymaga wyznaczenia wartości parametrów fizyko-mechanicznych materiału. Podstawową wyznaczaną wielkością jest statyczny moduł Younga będący miarą sprężystości materiału elastomerowego. W artykule przedstawiono porównanie metod wyznaczania statycznego modułu Younga dla próbek materiału elastomerowego. Przedstawiono metodykę badań oraz ich wyniki.
Proper selection of elastomeric materials that may be used in vibration isolation systems requires the determination of the physico-mechanical parameters of the material. The basic determinant is the static Young's modulus, which is the measure the elasticity of the elastomeric material. The article presents a comparison of methods for determining static Young's modulus for samples of elastomeric material. The research methodology and results are presented.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2017, 18, 12; 723-729, CD
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microhardness and the Young Modulus of Thin, MBE-Grown, (Sn,Mn)Te Layers Containing up to 8% of Mn
Autorzy:
Adamiak, S.
Zięba, M.
Minikayev, R.
Reszka, A.
Taliashvili, B.
Szuszkiewicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/1033220.pdf
Data publikacji:
2017-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.de
62.20.Qp
68.60.Bs
Opis:
The thin layers of (Sn,Mn)Te solid solution were grown by molecular beam epitaxy onto (111)-oriented BaF₂ substrates and characterized by scanning electron microscopy, atomic force microscopy, energy dispersive X-ray spectrometry, and X-ray diffraction methods. The epitaxial character of the growth was confirmed. All the layers exhibited a regular (fcc) structure of the rock-salt type and were (111)-oriented, their thickness was close to about 1 μm. The layers contained up to 8% of Mn. The microhardness and the Young modulus values were determined by the nanoindentation measurements. The Berkovich type of the intender was applied, the maximum applied load was equal to 1 mN. The results of measurements demonstrated a lack of the composition dependence of the Young modulus value. A slight increase of the microhardness value with an increasing Mn content in the (Sn,Mn)Te solid solution was observed.
Źródło:
Acta Physica Polonica A; 2017, 132, 2; 347-350
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Storage temperature influence on Young modulus of tomato skin
Analiza zmiennosci modulu Younga skorki owocow pomidora w roznych temperaturach przechowywania
Autorzy:
Kuna-Broniowska, I.
Gladyszewska, B.
Ciupak, A.
Powiązania:
https://bibliotekanauki.pl/articles/792280.pdf
Data publikacji:
2011
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
Young's modulus
tomato skin
storage temperature
tomato fruit
Admiro cultivar
Encore cultivar
material strength
critical stress
statistical analysis
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2011, 11
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of finite element method for analysis of nanostructures
Autorzy:
Bocko, J.
Lengvarský, P.
Powiązania:
https://bibliotekanauki.pl/articles/387168.pdf
Data publikacji:
2017
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
beam elements
spring element
young's modulus
Poisson's ratio
Opis:
The paper deals with application of the finite element method in modelling and simulation of nanostructures. The finite element model is based on beam elements with stiffness properties gained from the quantum mechanics and nonlinear spring elements with forcedisplacement relation are gained from Morse potential. Several basic mechanical properties of structures are computed by homogenization of nanostructure, e.g. Young's modulus, Poisson's ratio. The problems connecting with geometrical parameters of nanostructures are considered and their influences to resulting homogenized quantities are mentioned.
Źródło:
Acta Mechanica et Automatica; 2017, 11, 2; 116-120
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamic and mechanical characterisation of kaolin clay
Autorzy:
Hammouda, I.
Mihoubi, D.
Powiązania:
https://bibliotekanauki.pl/articles/779615.pdf
Data publikacji:
2014
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
drying
desorption isotherms
volume shrinkage
Young's modulus
relaxation
Opis:
This study deals with experimental thermodynamic and rheological characterization of kaolin. Water sorption isotherms of kaolin were determined for three temperatures (30, 50 and 70°C). Desorption isotherms were fitted by using five models (GAB, BET, Henderson modified, Adam and Shove, Peleg) among the most used ones in literature. The GAB model was found to be the most suitable for describing the relationship between equilibrium moisture content and water activity for the whole range of temperature (30-70°C) and relative humidity(0-100%). Desorption enthalpy and entropy were determined. The desorption enthalpy decreases with increasing moisture content. The density and the shrinkage of the material and the Young’s modulus variations as a function of moisture content were determined experimentally. The Young modulus varies between 0.1 MPa and 14 MPa. The viscoelastic parameters of kaolin were also determined by using a series of Prony.
Źródło:
Polish Journal of Chemical Technology; 2014, 16, 1; 28-35
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FEM modelling of the static behaviour of reinforced concrete beams considering the nonlinear behaviour of the concrete
Autorzy:
Pazdan, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/1845144.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
concrete
reinforced concrete
deflection
numerical analysis
Young's modulus
Opis:
This paper presents a finite element (FE) method of modelling reinforced concrete beams. The proposed model takes into account the phenomena characteristic of reinforced concrete structures, such as the interaction between two materials (concrete and steel), the cracking caused by mechanical loads and the variation of the Young's modulus under increasing load. A relevant numerical FE analysis was carried out in the ABAQUS system using the concrete damaged plasticity (CDP) model. The character of Young's modulus variation due to increasing stress intensity level was taken from the author’s own research. The results of the FE calculations were compared with the results yielded by the author's numerical bar model.
Źródło:
Studia Geotechnica et Mechanica; 2021, 43, 3; 206-223
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geomechanical properties of shale rock from Baltic Basin in Poland area
Autorzy:
Laura, A.
Powiązania:
https://bibliotekanauki.pl/articles/1203995.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
shale gas
geomechanical properties
mineralogy
Poisson's ratio
Young modulus
Opis:
The successful development of shale gas requires a fundamental understanding of shales and that can be challenging because these rocks vary significantly. For recoverable shale gas resources assessment a broad range of geological, geochemical, geophysical and geomechanical data is required. Information about the variable lithologies, mineralogies, and kerogen content is vital to locate favorable intervals for gas production. Knowledge of the in-situ stresses and porosity of these intervals is essential for developing hydraulic fracturing strategies to recover the gas in place. Geomechanical properties of shales are important in terms of determination of the likelihood of fractures initiating and propagating in shale materials. Geomechanical properties of rock include: Poisson's Ratio, Total Minimum Horizontal Stress, Bulk, Young and Shear Modulus. These properties play significant role in developing shale assets. Having access to geomechanical data can assist engineers and geoscientists during geomechanical modeling, hydraulic fracture treatment design and in some cases during reservoir modeling in shale gas fields. This paper is intended to give characterization of geomechanical properties of shale rock. It then refers to a case study of Baltic Basin of shale gas in Poland, for discussing it geological condition and rock properties.
Źródło:
AGH Drilling, Oil, Gas; 2015, 32, 2; 369-380
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
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