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    Wyświetlanie 1-9 z 9
    Tytuł:
    DMA analysis of the structure of crosslinked poly(methyl methacrylate)s
    Autorzy:
    Barszczewska-Rybarek, I. M.
    Korytkowska-Wałach, A.
    Kurcok, M.
    Chladek, G.
    Kasperski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/307446.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    PMMA
    moduł sprężystości
    DMA
    parametry sieciowe
    corosslink density
    network parameters
    storage modulus
    glass temperature
    Opis:
    Purpose: This paper presents the study aimed at the development of crosslinked poly(methyl methacrylate)s (X-PMMA) of varied crosslink density and the investigation of the relationships between the polymer network structure and dynamic mechanical properties. Methods: A series of model X-PMMA networks were crosslinked by the introduction of: 1, 2, 5, 10 and 20% of triethylene glycol dimethacrylate (TEGDMA). The copolymerizations led to various glass-rubber relaxation properties of the polymer networks, as revealed by dynamic-mechanical analysis (DMA). Glass temperature (Tg) and storage modulus above the Tg ( ) Erubbery were a sensitive function of network architecture. DMA data were used for calculating the network parameter (Mc), crosslink density (q) and its alternative measure – the degree of crosslinking (DX). Results: The viscoelastic properties as well as structural parameters calculated from those showed correlation with the amount of the crosslinker. The increase in TEGDMA content resulted in the Tg, q and DX increases, whereas Mc decrease. The possible incomplete conversion of double bonds was detected in the DMA analysis, which was confirmed by the degree of conversion (DC), measured by FTIR spectroscopy. Additionally, some amount of sol fraction was found by 1H NMR experiments. Conclusions: The structure-property relationships developed for the system presented in this work could be useful in tissue engineering, where X-PMMA is applied. The direct measure of storage modulus values before and above glass transition may serve as a simple and fast indicator of the X-PMMA crosslink density.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 1; 47-53
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic mechanical characterization of epoxy composite reinforced with areca nut husk fiber
    Autorzy:
    Muralidhar, N.
    Kaliveeran, Vadivuchezhian
    Arumugam, V.
    Srinivasula Reddy, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/139576.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    areca nut husk fiber
    dynamic mechanical analysis
    storage modulus
    loss modulus
    elastic modulus
    damping factor
    Opis:
    Natural fiber polymer composites are gaining focus as low cost and light weight composite material due to the availability and ecofriendly nature of the natural fiber. Fiber composites are widely used in civil engineering, marine and aerospace industries where dynamic loads and environmental loads persist. Dynamic analysis of these composites under different loading and environmental conditions is essential before their usage. The present study focuses on the dynamic behavior of areca nut husk reinforced epoxy composites under different loading frequencies (5 Hz, 10 Hz and 15 Hz) and different temperatures (ranging from 28◦C to 120◦C). The effect of loading and temperature on storage modulus, loss modulus and glass transition temperature was analyzed. Increase in storage modulus is observed with increase in loading frequency. The storage modulus decreases with increase in temperature. The glass transition temperature of the composite is determined to be 105◦C. The elastic modulus calculated from the DMA data is compared with three point bending test
    Źródło:
    Archive of Mechanical Engineering; 2020, LXVII, 1; 57-72
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical model analysis of sample from polyurethane vibroinsulation mat
    Analiza modelu matematycznego próbki maty wibroizolacyjnej
    Autorzy:
    Dzikowska, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/95486.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydawnictwo PB
    Tematy:
    vibroinsulation mat
    loss modulus
    storage modulus
    mathematical model
    mata wibroizolacyjna
    moduł stratności
    moduł zachowawczy
    model matematyczny
    Opis:
    The paper presents further developments in mathematical modelling of vibroinsulation mats. There was proposed the introduction of new parameters for characterizing the properties of the mat. An attempt to analyze the model in terms of its dynamic properties resulting from the determination of frequency transfer function was made. In conclusion the methodology of the studies necessary to quantify the material constants model was described.
    W pracy zaprezentowano kolejny etap rozwoju modelu matematycznego poliuretanowej maty wibroizolacyjnej. Zaproponowano wprowadzenie nowych parametrów chrakteryzujących własności maty. Podjęto próbę analizy modelu ze względu na jego własności dynamiczne wynikające z określenia transmitancji częstotliwościowej. W podsumowaniu opisano metodykę badań koniecznych do ilościowego określenia stałych materiałowych modelu.
    Źródło:
    Postępy w Inżynierii Mechanicznej; 2014, 3(2); 13-20
    2300-3383
    Pojawia się w:
    Postępy w Inżynierii Mechanicznej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic Mechanical Properties of Artifcially Aged Double Base Rocket Propellant and the Possibilities for the Prediction of Their Service Lifetime
    Autorzy:
    Matečić-Mušanić, S.
    Sućeska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/358886.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    ageing
    double base rocket propellants
    dynamic mechanical analysis
    glass transition temperature
    lifetime prediction
    loss modulus
    softening temperature
    storage modulus
    tan δ
    Opis:
    The ageing of double base (DB) rocket propellants, as a consequence of the chemical reactions and physical processes that take place over time, has a signifcant effect on their relevant properties, such as chemical composition and mechanical and ballistic properties. The changes to relevant properties limit the safe and reliable service life of DB rocket propellants. Accordingly, numerous research efforts have been undertaken to fnd reliable methods to measure the changes caused by ageing in order to assess the quality of DB rocket propellants at a given moment of their lifetime, and to predict their remaining service lifetime. In this work we studied the dynamic mechanical properties of DB rocket propellant artifcially aged at temperatures of 80, 85 and 90 °C, in order to detect and quantify changes in the dynamic mechanical properties caused by ageing, and to investigate the possibilities for the prediction of service lifetime. Dynamic mechanical properties were studied using a dynamic mechanical analyser (DMA). The results obtained have shown that ageing causes signifcant changes in the storage modulus (E´), the loss modulus (E˝) and the tan δ curves’ shape and position. These changes are quantifed by following some characteristic points on the E´-T, E˝-T, and tan δ-T curves (e.g. glass transition temperatures; storage modulus, loss modulus and tan δ at characteristic temperatures, etc.). It has been found that the monitored parameters are temperature and time dependent, and that they can be shown to be functions of the so called ‘reduced time of artifcial ageing’. In addition, it has been found that, on the basis of known changes in viscoelastic properties as a function of time and ageing temperature, and the known kinetic parameters of the ageing process, it is possible to calculate (determine) the change in the properties at any ageing temperature provided that the mechanism of the ageing process does not change. Unfortunately, the use of kinetic parameters obtained by artifcial ageing at high temperatures (above 60 °C) for the prediction of the propellant lifetime will not give reliable results, because the mechanisms of ageing at 85 °C and 25 °C are not the same.
    Źródło:
    Central European Journal of Energetic Materials; 2013, 10, 2; 225-244
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of physical and dynamic mechanical properties of coconut husk ash (CHA) reinforced polyester composites
    Autorzy:
    Ipilakyaa, Tertsegha
    Tuleun, Livinus
    Sule, Terngu
    Powiązania:
    https://bibliotekanauki.pl/articles/1819156.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    dynamic mechanical analysis
    sieve analysis
    storage modulus
    loss modulus
    mechanical loss factor
    dynamiczna analiza mechaniczna
    analiza sitowa
    moduł zachowawczy
    moduł stratności
    współczynnik stratności mechanicznej
    Opis:
    The evaluation of physical and dynamic mechanical analysis (DMA) properties was carried out on a developed Coconut Husk Ash Reinforced Polymer Composite. Sieve analysis of pretreated coconut husk ash was done to obtain 75 μm, 150 μm and 300 μm particles sizes. These particles were used at varying compositions of 5%, 10%, 15%, 20% and 25% as reinforcements for polyester composites. The catalyst and accelerator used were Methyl Ethyl Ketone Peroxide and Cobalt Naphthenate respectively. The densities of the evaluated composites made with 150 μm particles were found to be less dense with values ranging from 0.9792 g/cm3 to 1.2561 g/cm3 than those made with 75 μm and 300 μm. The results also show that the percentage water absorbed by samples increased, ranging from 0 to over 2000 E’/MPa for all percentage reinforcements of coconut husk ash, with an increase in the duration of immersion of the samples in distilled water. However, 25% reinforcement had better results for all particle sizes. There were obvious variations of storage modulus, loss modulus and mechanical loss factor with percentage weight of reinforcement, temperature and frequency. The composite with 15%reinforcement displayed better results. The composite shows promising results as a material for interior components in aerospace and automobile industries.
    Źródło:
    Journal of Mechanical and Energy Engineering; 2020, 4, 4; 315--324
    2544-0780
    2544-1671
    Pojawia się w:
    Journal of Mechanical and Energy Engineering
    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:
    Concept of underground gas storage in the limestone rocks in Slovenia
    Autorzy:
    Vukelić, Željko
    Vulić, Milivoj
    Powiązania:
    https://bibliotekanauki.pl/articles/103386.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    underground storage of gas
    lined rock cavern
    limestone
    elastic modulus
    podziemne magazynowanie gazu
    wapień
    moduł sprężystości
    Opis:
    The paper provides research and results for underground storage of gas (UGSG) in limestone rocks, which were carried out in Slovenia – Central Europe. The areas was geological surveyed and in addition structural boreholes were drilled up to the depth of 350 m. The cores were logged with emphasis on stratigraphy, layering, rock joints, tectonic zones, RQD… and addition characteristics samples were taken for the laboratory rocks geomechanical characteristics investigations. In boreholes geophysical, pressiometric and hydro-geological investigations were also carried out. In the area where the researches have been carried out, limestone, dolomites and breccias are prevalent. Storage should be built for pressure between 15 and 20 MPa. Explorations confirmed that there is a possibility of building a high-pressure underground storage of gas (UGSG) and using applied mechanics for design LRC (Lined Rock Cavern) technology. The construction of underground storage facilities for natural gas storage is important in cases, where the gas supply does not meet the required capacity for operation of the thermal power plant.
    Źródło:
    Advances in Science and Technology. Research Journal; 2018, 12, 3; 197-202
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of trabecular bone storage method on its elastic properties
    Autorzy:
    Mazurkiewicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/307220.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    analiza statystyczna
    moduł sprężystości
    kość beleczkowa
    zamrażanie-odmrażanie cykliczne
    statistical analysis
    elastic modulus
    trabecular bone
    freeze-thaw cycle
    storage method
    Opis:
    Purpose: The purpose of the study was to evaluate the effects of different methods of trabecular bone storage on changes in its elastic properties. Methods: 186 porcine trabecular bone samples were divided into 6 groups, approximately 30 samples each. Five groups were stored using the following methods: in buffered 10% formalin solution at room temperature, frozen at –21 C, in the open air at room temperature, in 96% alcohol solution and in 50% alcohol solution at room temperature. The samples were subjected to compression test to measure the elastic modulus. The samples after the first measurement were subjected to further measurements for 14 weeks, every 2 weeks. The sixth group was used to determine the effects of 10 freeze-thaw cycles on changes in the elastic modulus. A Kolmogorov–Smirnov test at significance level p = 0.05 was used to determine the significance of changes in time. Results: The changes in elastic properties caused by the different storage methods were statistically insignificant, except for the group of samples stored in the open air. The changes in elastic modulus after 10 freeze-thaw cycles were also statistically insignificant. Conclusions: Except for the storage method in the open air, other storage methods did not significantly affect changes in elastic properties of the trabecular bones after 14 weeks. No effects of 10 freeze-thaw cycles on changes in elastic modulus were observed.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 1; 21-27
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A storage time influence on mechanical parameters of tomato fruit skin
    Wplyw czasu przechowywania na parametry wytrzymalosciowe skorki owocow pomidora
    Autorzy:
    Gladyszewska, B.
    Ciupak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/793002.pdf
    Data publikacji:
    2011
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    tomato fruit
    Admiro cultivar
    Encore cultivar
    Surya cultivar
    Polset cultivar
    tomato skin
    mechanical property
    storage time
    Poisson's ratio
    Young's modulus
    critical stress
    comparative analysis
    Opis:
    Presented work introduces the results of comparative analysis concerning selected mechanical properties of greenhouse Admiro and Encore and soil-grown Surya and Polset tomato’s cultivars skin, stored at 13°C. A statistically significant effect of both: variety and storage time on the Young’s modulus, critical stress and Poisson’s ratio values was observed. The Young’s modulus determined for greenhouse fruit’s skin demonstrated considerably higher values than observed for the soil-grown varieties, in addition the highest values were set for an Encore while the lowest one for a Polset variety. The values of Young’s modulus and critical stress decreased with the storage time growth while the Poisson’s ratio remained in the range from 0.4 to 0.49. Poisson’s ratio, established for greenhouse tomato’s peel, took higher values than in the Encore variety case.
    W pracy przedstawiono wyniki analizy porównawczej wybranych mechanicznych właściwości skórki owoców pomidora szklarniowego odmian Admiro i Encore oraz owoców pomidora gruntowego odmian Polset i Surya przechowywanych w temperaturze 13ºC. Stwierdzono statystycznie istotny wpływ odmiany i czasu przechowywania na wartość modułu Younga, naprężenia krytycznego i współczynnika Poissona. Moduł Younga skórki owoców szklarniowych był wyższy niż skórki owoców gruntowych. Najwyższą wartość wy znaczono dla owoców odmiany Encore, zaś najniższą dla owoców odmiany Polset. Wartość modułu Younga, naprężenia krytycznego skórki owoców gruntowych obniżała się wraz z wydłużaniem czasu przechowywania, zaś współczynnik Poissona zawierał się w przedziale 0,4 – 0,49. Współczynnik Poissona wyznaczony dla skórki owoców pomidora szklarniowego odmiany Admiro charakteryzował się wyższą wartością niż w przypadku odmiany Encore.
    Źródło:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2011, 11C
    1641-7739
    Pojawia się w:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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