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Wyszukujesz frazę "Akbarzadeh, M." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    A multi-spring model for buckling analysis of cracked Timoshenko nanobeams based on modified couple stress theory
    Autorzy:
    Akbarzadeh Khorshidi, M.
    Shariati, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/281289.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    buckling
    crack
    modified couple stress theory
    Timoshenko nanobeam
    spring model
    Opis:
    This paper develops a cracked nanobeam model and presents buckling analysis of this developed model based on a modified couple stress theory. The Timoshenko beam theory and simply supported boundary conditions are considered. This nonclassical model contains a material length scale parameter and can interpret the size effect. The cracked nanobeam is modeled as two segments connected by two equivalent springs (longitudinal and rotational). This model promotes discontinuity in rotation of the beam and additionally considers discontinuity in longitudinal displacement due to presence of the crack. Therefore, this multi-spring model can consider coupled effects between the axial force and bending moment at the cracked section. The generalized differential quadrature (GDQ) method is employed to discretize the governing differential equations, boundary and continuity conditions. The influences of crack location, crack severity, material length scale parameter and flexibility constants of the presented spring model on the critical buckling load are studied.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2017, 55, 4; 1127-1139
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molybdenum Disulfide (MoS2) Coating on AISI 316 Stainless Steel by Thermodiffusion Method
    Autorzy:
    Akbarzadeh, M.
    Zandrahimi, M.
    Moradpour, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/351550.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermo-diffusion method
    solid lubricant coating
    molybdenum disulfide
    Opis:
    Molybdenum disulfide (MoS2) is one of the most widely used solid lubricants applied in different ways on the surfaces under friction. In this work, AISI 316 austenitic stainless steel was coated with MoS2, using thermo-diffusion method at different temperatures and times. Coatings properties were investigated using SEM, EDX, XRD and FTIR, Hardness Tester and Roughness tester. The results illustrated the formation of a uniform layer on the surface, containing MoS2 and MoO3–X phases. The thickness, grain size and the hardness of the coatings were 20-50 μm, 400-1000 nm and 350- 550 HV respectively. Friction tests carried out using ball-on-disc method under normal loads of 10 N under ambient conditions showed values of the friction coefficient 0.30-0.40. In addition, the kinetics of diffusion layers between the substrate and the coating were also investigated. It was found that there at steady temperature there is a parabolic relationship between the thickness of the diffusion layer and the treatment time. The activation energy for the process was estimated to be 143 kJ mol-1. Depending on the treatment time and temperature, the thicknesses of diffusion layer varied between 0.5 and 2.5 microns.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1741-1748
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of the Density of Energetic Materials on the Basis of their Molecular Structures
    Autorzy:
    Rahimi, R.
    Keshavarz, M. H.
    Akbarzadeh, A. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/358109.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    crystal density
    energetic compound
    QSPR
    MLR
    ANN
    Opis:
    The density of an energetic compound is an essential parameter for the assessment of its performance. A simple method based on quantitative structure-property relationship (QSPR) has been developed to give an accurate prediction of the crystal density of more than 170 polynitroarenes, polynitroheteroarenes, nitroaliphatics, nitrate esters and nitramines as important classes of energetic compounds, by suitable molecular descriptors. The evaluation techniques included cross-validation, validation through an external test set, and Y-randomization for multiple linear regression (MLR) and training state analysis for artificial neural network (ANN), and were used to illustrate the accuracy of the proposed models. The predicted MLR results are close to the experimental data for both the training and the test molecular sets, and for all of the molecular sets, but not as close as the ANN results. The ANN model was also used with 20 hidden neurons that gave good result. The results showed high quality for nonlinear modelling according to the squared regression coefficients for all of the training, validation and the test sets (R2 = 0.999, 0.914 and 0.931, respectively). The calculated results have also been compared with those from several of the best available predictive methods, and were found to give more reliable estimates.
    Źródło:
    Central European Journal of Energetic Materials; 2016, 13, 1; 73-101
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Characterization of Molybdenum Disulfide Composite Coating on Steel Using Chemical Vapor Deposition
    Autorzy:
    Akbarzadeh, M.
    Zandrahimi, M.
    Moradpour, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/351037.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    chemical vapor deposition method
    solid lubricant coating
    molybdenum disulfide
    Opis:
    Molybdenum disulfide (MoS2 ) is one of the most widely used solid lubricants applied in different ways on the surfaces under friction. In this work, AISI 316 austenitic stainless steel was coated with MoS2 , using chemical vapor deposition (CVD) at four different temperatures (400, 500, 600 and 700°C). Coatings properties were investigated using SEM, EDX, XRD and FTIR, Hardness Tester and Roughness tester. The results showed that with simultaneous evaporation of sulfur and molybdenum trioxide (MoO3 ) in the CVD chamber, a uniform coating layer containing MoS2 and MoO2 phases was formed. Increase in the substrate temperature resulted in the rise in the amount of MoS2 to MoO2 phases. The thickness, grain size and the hardness of the coating were 17-29 μm, 50-120 nm and 260-480 HV respectively. Friction tests carried out using pin-on-plate method under normal loads of 10 N under ambient conditions showed values of the friction coefficient 0.25-0.40.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 2; 555-562
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using soil binders to control runoff and soil loss in steep slopes under simulated rainfall
    Autorzy:
    Akbarzadeh, A.
    Toghizadeh Mehrjardi, R.
    Refahi, H.G.
    Rouhipour, H.
    Gorji, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/26546.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Źródło:
    International Agrophysics; 2009, 23, 2; 99-109
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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