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- 저자 : Kasiri, Reza (검색결과 5 건)
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Kasiri, Reza,Massah, Saeed Reza Techno-Press 2022 Advances in nano research Vol.12 No.1
Due to the extensive use of concrete structures in various applications, the improvement of their strength and quality has become of great importance. A new way of achieving this purpose is to add different types of nanoparticles to concrete admixtures. In this work, a mathematical model has been employed to analyze the vibration of concrete beams reinforced by graphene oxide (GO) nanoparticles. To verify the accuracy of the presented model, an experimental study has been conducted to compare the compressive strengths of these beams. Since GO nanoparticles are not readily dissolved in water, before producing the concrete samples, the GO nanoparticles are dispersed in the mixture by using a shaker, magnetic striker, ultrasonic devices, and finally, by means of a mechanical mixer. The sinusoidal shear deformation beam theory (SSDBT) is employed to model the concrete beams. The Mori-Tanaka model is used to determine the effective properties of the structure, including the agglomeration influences. The motion equations are calculated by applying the energy method and Hamilton's principle. The vibration frequencies of the concrete beam samples are obtained by an analytical method. Three samples containing 0.02% GO nanoparticles are made and their compressive strengths are measured and compared. There is a good agreement between our results and those of the mathematical model and other papers, with a maximum difference of 1.29% between them. The aim of this work is to investigate the effects of nanoparticle volume fraction and agglomeration and the influences of beam length and thickness on the vibration frequency of concrete structures. The results show that by adding the GO nanoparticles, the vibration frequency of the beams is increased.
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Norollah Kasiri,Sepideh Roshdi,Seyyed Hassan Hashemabadi,Javad Ivakpour 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.3
Computational fluid dynamic models (CFD) have been used for the description of hydraulic characteristics of packed sieve tray (PST). PST is a conventional sieve tray combined with a slice thickness of packing on the tray deck. Eulerian-Eulerian framework has been used to solve the equations of both liquid and gas phases assumed as two interpenetrating phases. A commercial scaled sieve tray has been simulated based on a three-dimensional unsteady state model. Comparison with experimental data proves good agreement for the simulation results under the studied conditions. Effects of the packing on the liquid velocity distribution, clear liquid height and vertical liquid volume fraction distribution have been investigated. The simulation results show that 3.08 cm of packing thickness could increase the clear liquid height up to 17 percent and froth height up to 10 percent as well as promoting froth density by 6 percent with the only drawback of increasing wet pressure drop up to 16 percent in froth regime.
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Matrix based method for synthesis of main intensified and integrated distillation sequences
Norollah Kasiri,Amirhossein Khalili-Garakani,Javad Ivakpour 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.4
The objective of many studies in this area has involved access to a column-sequencing algorithm enabling designers and researchers alike to generate a wide range of sequences in a broad search space, and be as mathematically and as automated as possible for programing purposes and with good generality. In the present work an algorithm previously developed by the authors, called the matrix method, has been developed much further. The new version of the algorithm includes thermally coupled, thermodynamically equivalent, intensified, simultaneous heat and mass integrated and divided-wall column sequences which are of gross application and provide vast saving potential both on capital investment, operating costs and energy usage in industrial applications. To demonstrate the much wider searchable space now accessible, a three component separation has been thoroughly examined as a case study, always resulting in an integrated sequence being proposed as the optimum.
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Mojtaba Naalchian,Masoud Kasiri‑Asgarani,Morteza Shamanian,Reza Bakhtiari,Hamid Reza Bakhsheshi‑Rad 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.11
In this study, a dissimilar joint of cobalt based superalloys X-45 and FSX-414 has been created under the standard heattreatment conditions with the nickel-based BNi-9 interlayer with the thickness of 50 μm by the transient liquid phase bondingprocess. Solution heat treatment (1150 °C/4 h) was used for bonding and the aging heat treatment (980 °C/4 h) for thehomogenization of the bond. Optical metallography, Field Emission Scanning Electron Microscope with Energy DispersiveX-ray Spectroscopy, Differential scanning calorimetry, micro-hardness test and shear strength test were used for the characterizationof microstructural and mechanical evolution in base metals and bonds. The solution heat treatment leads to thedissolution of a part of the M23C6and M6Ccarbides in the substrate of superalloys, which due to the aging heat treatmentsecondary and fine carbides M23C6precipitate in the substrate and help strengthen the superalloys. The diffusion of theboron from the molten interlayer to the base metals resulted in the complete isothermal solidification and a nickel-basedsingle-phase solid solution has been developed. Cobalt-chromium-tungsten-molybdenum-based carboborides precipitationwith high hardness in the vicinity of the isothermal solidification zone and in base metals results in the non-homogeneityof microhardness profile along the bonding area. Homogenization heat treatment did not have an effect on the omission ofthese precipitations, but by more uniform redistribution of the alloying elements strengthen solid solution that could increaseshear strength from 655 to 688 MPa, which is somewhat equivalent to the shear strength of the 45-X alloy and also 93% ofthe shear strength of the FSX-414 alloy.
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Friction Stir Welding of EN 10130 Low Carbon Steel
Akbar Alimohamady,Abbas Eghlimi,Hosain Nourozi Foroshani,Mohamad Alipour Behzadi,Javad Mohammadi,Masoud Kasiri Asgarani 대한용접·접합학회 2020 대한용접·접합학회지 Vol.38 No.3
After evaluating the weldability of 1.5 ㎜ thick EN 10130 steel sheets, the influence of friction stir welding parameters, i.e., rotation speed, tool advancing speed, pin diameter, and shoulder diameter on the properties of sound joints was examined. Using metallography, scanning electron microscope, tensile test, microhardness measurement, limiting dome height test, and forming limit diagrams, it was found that having a flawless joint requires the rotation and advancing speeds to be in the range of 500-1000 rpm and 30-160 ㎜.min<SUP>-1</SUP>, respectively. A design of experiment with 29 samples based on the Box-Behnken response surface methodology method with 5 center points was then utilized to maximize the tensile strength. Accordingly, the safe range and an optimized point for welding parameters were defined.
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