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    Wyświetlanie 1-5 z 5
    Tytuł:
    Determination of the Fatigue Behavior of a Wheel Rim Using Finite Element Analysis
    Autorzy:
    Esener, E.
    Ercan, S.
    Firat, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031128.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.10.Kn
    81.70.Bt
    Opis:
    Automobile wheel rims are critical elements that work under fatigue loading. For this reason, it is very important to determine fatigue damage of the wheel rims. Today, finite element analysis is used to make accurate predictions. In this study, it is aimed to determine Chaboche damage model parameters for an aluminium alloy wheel rim. Msc Marc software is used for finite element analysis. First, Chaboche damage model parameters are obtained using simple Holloman equation for finite element analysis. Model parameters are validated by single element tests. Then, fatigue behaviour of an automobile wheel rim is analysed with verified Chaboche parameters. At last, critical areas under fatigue loading are identified on the wheel rim.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 617-619
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determining Springback Behavior of High-Strength Steels via Channel Forming Process
    Autorzy:
    Esener, E.
    Sönmez, E.
    Özsoy, M.
    Firat, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031636.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Hy
    06.60.Mr
    Opis:
    The increasing use of high-strength steels in sheet metal automotive parts usually brings about the springback problems that can not be easily solved, compared to stamping the parts of conventional steel grades. Prediction and compensation of springback at the design stage is very important from both, the academic and the industrial perspectives. For this purpose, finite element analysis and simulative tests are used to understand formability properties of the material. In this study, springback behaviour of high-strength steels was investigated. Angular channel forming process is used as a simulative test with the DP600, DP1000, and DP1400 materials. Channel forming die tools were designed using a shallowly curved geometry for investigating springback behaviour of materials. Die tools were manufactured and forming process was performed at a hydraulic press machine. Sample surfaces were scanned using optical scanning. Then, experimental springback surfaces were compared with reference geometry by shape deviation analysis. It is observed that springback amount of DP1400 is much greater than those of DP600 and DP800 steels. The DP600 steel has minimum springback amount in the flange region and it has shown the smallest deviation from the reference forming surface, as a result of shape deviation analysis.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 1010-1012
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tribological Behaviors of $SiO_2$ Added Polyester Matrix Thermosetting Composites
    Autorzy:
    Akinci, A.
    Ozsoy, M.
    Firat, M.
    Sen, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/1291866.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Qk
    12.60.Rc
    81.40.Pq
    Opis:
    In this study, the tribological behavior of polyester matrix composites filled with silicon dioxide ($SiO_2$) particles is investigated. The tribological characteristics of pure polyester and 10, 20, 30 and 40 wt% $SiO_2$ filled polyester composites were comparatively evaluated under dry sliding conditions. Wear tests were carried out at room temperature under the loads of 10, 20, and 30 N at the sliding speed of 1 m/s. The wear test results showed that the $SiO_2$ particles could improve the wear resistance. The friction coefficient of the polyester was getting increased from 0.228 to 1.1052 with an increase in $SiO_2$ content depending on applied loads. The results showed that the wear rates of pure polyester and $SiO_2$ filled polyester composites increased with increase in loads. The wear rates of the $SiO_2$ filled polyester composites were significantly affected from the $SiO_2$ content. The wear rate of the polyester changed from 8.0 × $10^{-7}$ $mm^3$/m to 1.72 × $10^{-5}$ $mm^3$/m depending on $SiO_2$ contents and applied loads.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 560-562
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Strength and Fatigue Life Calculation of Y32 Bogie Frame by Finite Element Method
    Autorzy:
    Ozsoy, M.
    Pehlivan, K.
    Firat, M.
    Ozsoy, N.
    Ucar, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402375.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    47.11.Fg
    46.50.+a
    Opis:
    In this study structural strength and fatigue life estimation of Y32 bogie frame were examined by finite element method. A static structural and fatigue life simulation were performed according to TS EN 13749 standard. The results of the static structural and fatigue life simulations depicted that Y32 bogie manufactured by Tuvasas achieved the regulations.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-327-B-329
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of luteolin on spermatological parameters, apoptosis, oxidative stress rate in freezing rabbit semen
    Autorzy:
    Akarsu, S.A.
    Acısu, T.C.
    Güngör, İ.H.
    Çakır Cihangiroğlu, A.
    Koca, R.H.
    Türk, G.
    Sönmez, M.
    Gür, S.
    Fırat, F.
    Esmer Duruel, H.E.
    Powiązania:
    https://bibliotekanauki.pl/articles/16647483.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    rabbit
    semen
    cryopreservation
    luteolin
    oxidative stress
    apoptosis
    Opis:
    The aim of the present study was to determine the effects of Luteolin (LUT) on semen quality, oxidative stress, apoptosis, acrosomal integrity, mitochondrial membrane potential and dead sperm ratio in rabbits. Ejaculates from six New Zealand rabbits were collected, evaluated and pooled. The pooling was divided into five groups as control (no additive) LUT 25 μM, LUT 50 μM, LUT 100 μM and LUT 200 μM and LUT added. It was then filled into a falcon tube with Tris-based extender at a final concentration of approximately 35 x 106 spermatozoa. Diluated rabbit semen samples were drawn into frozen and thawed. Frozen semen straws were thawed at 37°C in 30 seconds. According to our findings, no statistical difference was found between all doses of luteolin and the control group in the CASA (computer assisted sperm analysis) analysis performed at 4°C. However, total motility, progressive motility and rapid sperm percentage were found to be higher in the frozen and thawed rabbit semen at a dose of LUT 50 μM compared to the other groups (p<0.05). While amplitude of lateral head displacement (ALH) and beat cross-frequency (BCF) values were found at the lowest dose of LUT 200 μM, a statistically significant difference was observed between the other groups. When the flow cytometry results were examined, no statistical difference was found between the rate of dead sperm, acrosomal integrity, mitochondrial membrane potential and apoptosis rate. Morever, the H2O2 percentage was found to be lower in all experimental groups compared to the control group (p<0.001). In conclusion, the addition of LUT in long-term storage of rabbit semen provided a protective effect for spermatozoa with its antioxidative properties against damage caused by cryopreservation.
    Źródło:
    Polish Journal of Veterinary Sciences; 2023, 26, 1; 91-98
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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