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    Toughness prediction in functionally graded Al6061/SiCp composites produced by roll-bonding

    , Article Ceramics International ; Vol. 40, issue. 6 , 2014 , pp. 8809-8825 Pouraliakbar, H ; Hosseini Monazzah, A ; Bagheri, R ; Seyed Reihani, S. M ; Khalaj, G ; Nazari, A ; Jandaghi, M. R ; Sharif University of Technology
    Functionally graded aluminum matrix composites (FGAMC) are new advanced materials with promising applications due to their unique characteristics in which composite nature is combined with graded structure. Different architectures of Al6061/SiCp composite laminates were fabricated by successive hot roll-bonding. For FGAMCs, two composite layers as outer strips and a layer of Al1050 as interlayer were applied. To investigate laminate toughness, the quasi-static three-point bending test was conducted in the crack divider orientation. Genetic programming as a soft computing technique was implemented to find mathematical correlations between architectural parameters and experimentally obtained... 

    Inverse modelling for freshwater lens in small islands: Kish Island, Persian Gulf

    , Article Hydrological Processes ; Volume 27, Issue 19 , 2013 , Pages 2759-2773 ; 08856087 (ISSN) Ataie Ashtiani, B ; Rajabi, M. M ; Ketabchi, H ; Sharif University of Technology
    A number of challenges including instability, nonconvergence, nonuniqueness, nonoptimality, and lack of a general guideline for inverse modelling have limited the application of automatic calibration by generic inversion codes in solving the saltwater intrusion problem in real-world cases. A systematic parameter selection procedure for the selection of a small number of independent parameters is applied to a real case of saltwater intrusion in a small island aquifer system in the semiarid region of the Persian Gulf. The methodology aims at reducing parameter nonuniqueness and uncertainty and the time spent on inverse modelling computations. Subsequent to the automatic calibration of the... 

    Chromium carbonitride coating produced on DIN 1.2210 steel by thermo-reactive deposition technique: Thermodynamics, kinetics and modeling

    , Article Surface and Coatings Technology ; Volume 225 , 2013 , Pages 1-10 ; 02578972 (ISSN) Khalaj, G ; Nazari, A ; Khoie, S. M. M ; Khalaj, M. J ; Pouraliakbar, H ; Sharif University of Technology
    A duplex surface treatment on DIN 1.2210 steel has been developed involving nitriding and followed by chromium thermo-reactive deposition (TRD) techniques. The TRD process was performed in molten salt bath at 550, 625 and 700°C for 1-14h. The process formed a thickness up to 9.5μm of chromium carbonitride coatings on a hardened diffusion zone. Characterization of the coatings by means of scanning electron microscopy (SEM) and X-ray diffraction analysis (XRD) indicates that the compact and dense coatings mainly consist of Cr(C,N) and Cr2(C,N) phase. All the growth processes of the chromium carbonitride obtained by TRD technique followed a parabolic kinetics. Activation energy (Q) for the... 

    Influence of interfacial adhesion on the damage tolerance of Al6061/SiCp laminated composites

    , Article Ceramics International ; Volume 43, Issue 2 , 2017 , Pages 2632-2643 ; 02728842 (ISSN) Hosseini Monazzah, A ; Pouraliakbar, H ; Jandaghi, M. R ; Bagheri, R ; Seyed Reihani, S. M ; Sharif University of Technology
    Elsevier Ltd  2017
    In this study, lamination as extrinsic mechanism was considered to enhance damage tolerance of three-layer Al6061-5%vol. SiCp/Al1050/Al6061-5%vol. SiCp composites. To fabricate laminates of dissimilar interfacial adhesion, different rolling strains were applied during hot roll-bonding. The discrepancy in interfacial strength of laminates was examined by shear test while toughness values were studied using three-point bending test. It was revealed that both interfacial adhesion and damage tolerance were influenced by rolling strain. Interfacial bonding played the major role in the energy absorption during fracture which was quantified as initiation, propagation and total toughness. The... 

    A numerical investigation on the dynamic stall of a wind turbine section using different turbulent models

    , Article World Academy of Science, Engineering and Technology ; Volume 58 , 2009 , Pages 290-296 ; 2010376X (ISSN) Ahmadi, A ; Sharif, S ; Jamshidi, R ; Sharif University of Technology
    In this article, the flow behavior around a NACA 0012 airfoil which is oscillating with different Reynolds numbers and in various amplitudes has been investigated numerically. Numerical simulations have been performed with ANSYS software. First, the 2-D geometry has been studied in different Reynolds numbers and angles of attack with various numerical methods in its static condition. This analysis was to choose the best turbulent model and comparing the grids to have the optimum one for dynamic simulations. Because the analysis was to study the blades of wind turbines, the Reynolds numbers were not arbitrary. They were in the range of 9.71e5 to 22.65e5. The angle of attack was in the range... 

    Comparative process modeling and techno-economic evaluation of renewable hydrogen production by glycerol reforming in aqueous and gaseous phases

    , Article Energy Conversion and Management ; Volume 225 , December , 2020 Khodabandehloo, M ; Larimi, A ; Khorasheh, F ; Sharif University of Technology
    Elsevier Ltd  2020
    In this paper, a comparative techno-economic evaluation of hydrogen production by glycerol reforming in aqueous and gaseous phases are presented. To accomplish the techno-economic evaluation, firstly the process modeling and design are presented. Based on the equipment purchased costs, with 80 kg/h hydrogen production, the total cost of hydrogen production is estimated 3.65 and 3.55 $/kgH2 for steam reforming and aqueous phase reforming plants, respectively. Regarding the installation factor in the equipment costs, the total cost of hydrogen production is estimated 7.49 and 7.45 $/kgH2 for steam reforming and aqueous phase reforming plants, respectively. To investigate the impact of...