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Wyświetlanie 1-15 z 105
Tytuł:
Mechanical Properties of Polypropylene Composites with Different Reinforced Natural Fibers – A Comparative Study
Autorzy:
Simamora, Pintor
Simanjuntak, Josua
Sinulingga, Karya
Laksono, Andromeda Dwi
Powiązania:
https://bibliotekanauki.pl/articles/27323811.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
polypropylene
natural fibre
tensile strength
modulus young
flexural strength
Opis:
Developing environmentally friendly and recyclable natural fiber-reinforced polymer composites has recently attracted researchers’ attention and interest. Herein, a comparative study was conducted to compare the mechanical properties of polypropylene (PP) composites with different natural fiber reinforcement, including palm fiber (Arenga pinnata), rice straw (Oryza sativa), coconut husk (Cocos mucifera), old world forked fern leaves (dicranopteris linearis), and snake plant (Sansevieria trifasciata). This study aimed to compare the influence of the five natural fiber materials on the tensile strength and flexural strength of PP composites. The natural fibers were chemically treated with a 5% NaOH solution for 2.5 hours. In the preparation of composites, polypropylene as the matrix is heated to 300 °C and mixed randomly with natural fibers. The test results indicate that the composite with the highest tensile strength (38% higher than the lowest) and flexural strength (102% higher than the lowest) is obtained using the PP composite with reinforced rice straw fiber. In contrast, the PP composites with palm fiber have the lowest tensile strength (72% from the highest tensile strength) and the lowest flexural strength (UFSmin) (62% from the highest flexural strength) corresponds to the PP composites with coconut fiber. This study revealed that the flexural strength of all composite samples was greater than that of pure PP.
Źródło:
Journal of Ecological Engineering; 2023, 24, 7; 311--317
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
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:
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:
Dentinogenesis imperfecta : hardness and Young’s modulus of teeth
Autorzy:
Wieczorek, A.
Loster, J.
Ryniewicz, W.
Ryniewicz, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/306749.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
nanoindentation
enamel
dentinogenesis imperfecta
nanoindentacja
szkliwo nazębne
Opis:
Dentinogenesis imperfecta type II (DI-II) is the most common dental genetic disease with reported incidence 1 in 8000. Elasticity and hardness of the enamel of teeth are important values which are connected with their resistance to attrition. It is hypothesized that values of physical properties for healthy teeth and teeth with DI-II are different. The aim of the study was to investigate some physical properties of teeth extracted from patients with DI-II in comparison with normal teeth. The material of the study was six teeth: three lower molars, with clinical signs of DI-II, which were extracted due to complications of pulp inflammation and three other lower molars which were extracted for orthodontic reasons – well formed, without any signs of pathology. The surfaces of DI-II and normal teeth were tested on the CSM Instruments Scratch Tester machine (producer CSEM Switzerland) by Oliver & Pharr method. The indenter used was Vicker’s VG-73 diamond indenter. Additionally, the Scanning Electron Microscopy (SEM) analysis of the surface of the teeth with DI-II was made. Vickers hardness of the teeth with dental pathology (DI-II) was seven times smaller, and Young’s modulus six times smaller than those of healthy teeth. The parameters of hardness and elasticity of enamel of teeth with clinical diagnosis of DI-II were very much smaller than in normal teeth and because of that can be responsible for attrition.
Źródło:
Acta of Bioengineering and Biomechanics; 2013, 15, 3; 65-69
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
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
Tytuł:
Impact of thermal fatigue on young’s modulus of epoxy adhesives
Autorzy:
Kłonica, M.
Powiązania:
https://bibliotekanauki.pl/articles/102676.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
Young's modulus
epoxy adhesive
Hysol 9466
Hysol 3421
thermal shock
Opis:
The following paper presents a comparative analysis of two epoxy-based adhesives: Hysol 9466 and Hysol 3421, prior to and after thermal shock testing. The tests focused on determining Young’s modulus. Epoxy-based materials are among the most widespread adhesive materials used as universal structural adhesives. The prepared epoxy samples (Hysol 9466 and Hysol 3421) were subjected to thermal shock cycling tests, according to a specified programme, in a thermal shock testing chamber, at a temperature range –40 °C to +60 °C and in the number of 200 cycles. Conclusions from the tests are presented at the final stage of the paper.
Źródło:
Advances in Science and Technology. Research Journal; 2015, 9, 28; 103-106
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metody wyznaczania modułu Younga dla materiałów elastomerowych
Methods for estimation of youngs modulus for elastomeric materials
Autorzy:
Bednarz, J.
Bieleń, P.
Powiązania:
https://bibliotekanauki.pl/articles/311700.pdf
Data publikacji:
2017
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
materiały elastomerowe
moduł Younga
wibroizolacja
elastomeric materials
Young's modulus
vibroisolation
Opis:
Prawidłowy dobór materiałów elastomerowych mogących mieć zastosowanie w systemach wibroizolacji wymaga wyznaczenia wartości parametrów fizyko-mechanicznych materiału. Podstawową wyznaczaną wielkością jest moduł Younga będący miarą sprężystości materiału elastomerowego. W artykule przedstawiono porównanie metod wyznaczania 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 Young's modulus, which is the measure the elasticity of the elastomeric material. The article presents a comparison of methods for determining Young's modulus for samples of elastomeric material. The research methodology and results are presented.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2017, 18, 6; 513-517, CD
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical properties of Si3N4 – graphene composites sintered by SPS method
Autorzy:
Klimczyk, P.
Jaworska, L.
Cygan, S.
Morgiel, J.
Major, Ł.
Olszyna, A.
Powiązania:
https://bibliotekanauki.pl/articles/391862.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Tematy:
silicon nitride
graphene
Young's modulus
hardness
friction coefficient
wear rate
Opis:
Silicon nitride powder with a small addition of magnesium oxide and yttria stabilized tetragonal zirconia fine particles was used as a starting material. Multilayer graphene nanoplatelets were used as filler for silicon nitride based composites. Graphene content in the mixtures was 0‒2 wt. %. The composites were obtained by the Spark Plasma Sintering method at 1650°C under 35 MPa of uniaxial pressure. Separation of the agglomerated graphene platelets in the matrix was observed for these materials. Insufficient dispersity of graphene slightly decreased the mechanical properties of Si3N4 ceramics. The SEM and TEM microstructural analysis of sintered materials show that the applied pressure during the sintering process leads to the orientation of the graphene phase and in consequence causes anisotropy of properties. The differences of friction coefficients were examined with the Ball-on-Disc method for the two directions (parallel and perpendicular to the pressing axis). Also the specific wear rate of the ball for the direction parallel to pressing axis differ significantly in comparison to the wear for the direction perpendicular to the pressing direction.
Źródło:
Prace Instytutu Odlewnictwa; 2017, 57, 4; 235-239
1899-2439
Pojawia się w:
Prace Instytutu Odlewnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanoindentation and atomic force microscopy of thin surface layers formed on the shaft surface after burnishing process
Autorzy:
Kuznetsova, T.
Zubar, T.
Chizik, S.
Miszczak, A.
Labuda, W.
Powiązania:
https://bibliotekanauki.pl/articles/242839.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
microstructure
atomic force microscopy
nanoindentation
microhardness
Young's modulus
burnishing process
Opis:
The article presents the experimental results of investigation of the pumps shaft surface made of stainless steel after burnishing process. The process of burnishing shafts proposed here aims at increasing the service durability of marine pump shafts of seawater installations, which should give economic benefits in comparison with traditional methods. Burnishing process enables the achievement of high smoothness of machined surface together with the surface layer hardening. This process has been performed in industrial experience on universal machine tools and on CNC machines but it is regarded as plastic tooling. Therefore, the final formation of dimensions and service properties with the use of burnishing constitutes a chipless and dustless treatment, which allows for ranking burnishing among ecological tooling methods. The properties of the surface layers determine the tribological properties of the shaft. The methods of scanning electron microscopy (SEM), atomic force microscopy (AFM) and nanoindentation (NI) were used. The morphology of the changed layers formed by plastic deforming of steel during burnishing treatment was investigated on micro- and nanolevel by SEM and AFM after 1, 2, 3 and 4 passed of burnishing tool. The values of microhardness and Young´s modulus were measured on the shaft cross section from the surface till the 50 – 300 μm depth. The presence of the soft changed layer on the hardened shaft surface after burnishing process determines the decrease of the coefficient of friction during exploitation.
Źródło:
Journal of KONES; 2016, 23, 3; 303-310
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
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:
Metoda wyznaczania wartości dynamicznego modułu Younga oraz współczynnika tłumienia materiałów elastomerowych
Method for estimation of dynamic Youngs modulus and damping ratio for elastomeric materials
Autorzy:
Bednarz, J.
Bieleń, P.
Powiązania:
https://bibliotekanauki.pl/articles/312944.pdf
Data publikacji:
2017
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
elastomer
wibroizolacja
moduł Younga
pętla histerezy
vibroisolation
Young modulus
hysteresis loop
Opis:
Prawidłowy dobór materiałów elastomerowych mogących mieć zastosowanie w systemach wibroizolacji wymaga wyznaczenia wartości parametrów fizyko-mechanicznych materiału. Podstawowymi wyznaczanymi wielkościami są moduły Younga będące miarą sprężystości materiału elastomerowego oraz współczynniki tłumienia materiału. W artykule przedstawiono metodę wyznaczania dynamicznego modułu Younga dla próbek materiału elastomerowego oraz współczynnika tłumienia w oparciu o pętlę histerezy. 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 Young's modulus, which is the measure the elasticity of the elastomeric material and damping ratio of the material. The article presents a method for determining dynamic Young's modulus and damping ratio for samples of elastomeric material. The research methodology and results are presented.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2017, 18, 12; 716-722, CD
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 105

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