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    Investigation of reinforced sic particles percentage on machining force of metal matrix composite

    , Article Modern Applied Science ; Volume 6, Issue 8 , 2012 , Pages 9-20 ; 19131844 (ISSN) Fathipour, M ; Zoghipour, P ; Tarighi, J ; Yousefi, R ; Sharif University of Technology
    MAS  2012
    In this study two-dimensional finite element models of Al/SiC metal matrix composites (MMC) by using of ABAQUS Explicit software are investigated. Chip formations and machining forces for three types of MMC with 5, 15 and 20% of SiC reinforcement particles were studied and compared with experimental data. The resulted chips in simulation and the generated chips in experiments have both continuous and saw tooth in appearance. On the other hand, the variation of the cutting forces with the cutting time in simulation and experiment have fluctuating diagram. This is due to the interaction between cutting tool and SiC particles during chip formation. ABAQUS explicit software was used for... 

    Numerical finite element analysis of laterally loaded fin pile in sandy soil

    , Article Innovative Infrastructure Solutions ; Volume 4, Issue 1 , 2019 ; 23644176 (ISSN) Yaghobi, M. H ; Hanaei, F ; Fazel Mojtahedi, S. F ; Rezaee, M ; Sharif University of Technology
    Springer  2019
    In the present study, the behavior of fin pile under lateral loading was investigated by ABAQUS software. First, the generated model was verified against an available experimental small-scale test in the literature. Having conducted verification, a study was carried out on the fin pile dimensions under lateral loading. Different parameters, such as pile diameter, fin’s length, and width, were studied. Moreover, a study on the fin’s aspect ratio by setting fin’s area constant was conducted, and then, optimum fin’s ratio was obtained. The results indicated that both fin’s length and width could improve pile efficiency under lateral loading, yet fin’s length had a more critical impact, and... 

    The effect of non-uniformity in ground motions on the seismic response of arch dams

    , Article SN Applied Sciences ; Volume 3, Issue 3 , 2021 ; 25233971 (ISSN) Pouya, M. R ; Sohrabi Gilani, M ; Ghaemian, M ; Sharif University of Technology
    Springer Nature  2021
    Recorded ground accelerations at various locations of Karun III Dam during November 20, 2007, were recorded by an array of accelerometers located on the dam. In terms of amplitude and phase, these accelerations show non-uniformities in different elevations. In this paper, the effect of these non-uniform ground motions on the seismic response of the dam taking dam-reservoir-foundation interaction into account is investigated. The EACD-3D-2008 finite element program and ABAQUS Software are used for carrying out the seismic analyses. For this purpose, time histories of the earthquake accelerations are interpolated at nodal points located on the dam foundation interface. The analysis has been... 

    Finite element modeling of spleen tissue to analyze its interaction with a laparoscopic surgery instrument

    , Article ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010, 12 July 2010 through 14 July 2010, Istanbul ; Volume 4 , 2010 , Pages 103-107 ; 9780791849187 (ISBN) Tirehdast, M ; Mirbagheri, A ; Farahmand, F ; Asghari, M ; Sharif University of Technology
    Laparoscopic surgery is a Minimally Invasive Surgery (MIS) procedure which is performed in the abdominal cavity. In this paper, the spleen tissue and a laparoscopic surgical grasper were modeled using ABAQUS software to investigate the tool-tissue interaction, considering large deformations for the spleen tissue. The spleen tissue was modeled as a hyper-elastic material. The laparoscopic grasper includes three gripping jaws that always remain parallel. The sliding can occur between the gripping jaws and the spleen tissue. It was found that the relationship between the pinch forces and push forces keeps its linearity in different values of friction coefficient (0-0.3). The pushing force... 

    Coupling behavior of the pH/temperature sensitive hydrogels for the inhomogeneous and homogeneous swelling

    , Article Smart Materials and Structures ; Volume 25, Issue 8 , 2016 ; 09641726 (ISSN) Mazaheri, H ; Baghani, M ; Naghdabadi, R ; Sohrabpour, S ; Sharif University of Technology
    Institute of Physics Publishing  2016
    In this work, a model is developed to continuously predict homogeneous and inhomogeneous swelling behavior of pH/temperature sensitive PNIPAM hydrogels. Employing the model, homogeneous swelling of the pH/temperature sensitive hydrogel is investigated for free and biaxial constrained swelling cases. Comparing the model results with the experimental data available in the literature, the validity of the model is confirmed. The model is then employed to investigate inhomogeneous swelling of a spherical shell on a hard core both analytically and numerically for pH or temperature variations. In this regard, numerical tools are developed via preparing a user defined subroutine in ABAQUS software.... 

    Analytical Evaluation and Parametric Study of RBS (Ribbed Bracing System)with Finite Element Method

    , M.Sc. Thesis Sharif University of Technology Mazaherimeybodi, Forouzandeh (Author) ; Golafshani, Ali Akbar (Supervisor) ; Toufigh, Vahab (Supervisor)
    In this research, an innovative system, called ribbed bracing system (RBS), proposed to deal with poor performance and deficiency of brace buckling under compression loads. RBS is an additional component added to common brace system which prevents the buckling problem of conventional bracing systems. By applying tensile load, the ribs lock together and the system starts enduring tension. Since the compressive force begins, ribs slide on each other and the system endures only a trivial force. Two kinds of RBS mechanism are introduced: completely-closed RBS (CC-RBS) and self-centering RBS (SC-RBS). In the former mechanism, the length of the brace is reduced by applying compression loads; while... 

    Three-dimensional model for hot rolling of aluminum alloys

    , Article Materials and Design ; Volume 28, Issue 8 , 2007 , Pages 2366-2372 ; 02613069 (ISSN) Riahifar, R ; Serajzadeh, S ; Sharif University of Technology
    Elsevier Ltd  2007
    This paper describes the application of three-dimensional finite element analysis in hot slab rolling of aluminum alloys. To assess the rolling behavior of materials, finite element program Abaqus/Explicit has been employed and the hot rolling process was modeled in three dimensions. The temperature distribution, variation of flow stress, and flow pattern were determined during hot rolling of 6063 and 3003 aluminum alloys. Also, with the aid of the predicted results the geometrical changes and the rolling forces were determined. To check the validity of the employed model and equations, hot rolling experiments were conducted and roll force and temperature of the samples have been measured... 

    Seismic Behavior Modeling of An Arched-Roof Adobe Building

    , M.Sc. Thesis Sharif University of Technology Hasani, Mojahed (Author) ; Bakhshi, Ali (Supervisor) ; Ghannad, Mohammad Ali (Supervisor)
    Statistical studies indicate the fact that in Iran, like many other developing countries, a considerable percentage of houses are in the form of traditional buildings, and major losses due to recent earthquakes are because of masonry building collapse. In the early twentieth century in Iran every ten years a destructive earthquake has been occurred which has resulted in huge human casualties and economic losses. After the Bam 2003 earthquake, a team project was defined to investigate the behavior of rural houses with the aim of providing solutions to lessen seismic hazards, and the current study is the fifth phase of the following line of investigations. Among the existing kinds of rural... 

    Numerical Study of Ground Vibrations due to Pile Driving and Effect of Trench on Reduction of Amplitude of Vibrations

    , M.Sc. Thesis Sharif University of Technology Khoubani, Ali (Author) ; Ahmadi, Mohammad Mehdi (Supervisor)
    Ground vibration during pile driving is one the most important factors that limits usage of this kind of piles. It is of great importance to estimate the level of vibration prior to the beginning of pile driving to avoid structural damage or disturbance of building occupants. In this study, an axisymmetric finite element model that utilises an adaptive meshing algorithm has been introduced, using the commercial code ABAQUS, to simulate the full penetration of a pile from the ground surface to the desired depth by applying successive hammer impacts. The model has been verified by comparing the computed particles velocity with those measured in the field. The results indicate that the peak... 

    Numerical Analysis of Adobe Structure with Dome Roof under Earthquake Excitation

    , M.Sc. Thesis Sharif University of Technology Khajehpour, Mehdi (Author) ; Ghannad , Mohammad Ali (Supervisor) ; Bakhshi, Ali (Co-Advisor)
    After the heart-rending earthquake in Bam and its severe losses, the engineering community forced to pay special attention to the seismic vulnerability of traditional structures. Therefore, with the aim of reducing of such devastations to minimum, a multi-phase research project was defined at Sharif University of Technology to study the vulnerability and retrofitting of these structures which the current study is the eighth phase of that series research. In the third and fourth phases of this project, a typical adobe building with dome roof was chosen for study making use of shaking table facilities. The tests included both un-retrofitted and retrofitted states and considerable seismic... 

    Numerical Simulation of Al-Si Alloy Fatigue Behavior under Thermo-Mechanical and Isothermal Loads

    , M.Sc. Thesis Sharif University of Technology Ghodrati Ghalati, Mohammad (Author) ; Farrahi, Gholamhossein (Supervisor) ; Asghari, Mohsen (Co-Advisor)
    The main purpose in this thesis is the finite element simulation of the stress-strain behavior in an aluminum-silicon-magnesium alloy, subjected to low cycle fatigue and thermo-mechanical fatigue loadings. This finite element modeling is performed in the ABAQUS software. Two time-dependent and time-independent models are used to simulate the behavior of the material. The time-independent model is the combined nonlinear isotropic/kinematic hardening model, which predicts the mean stress relaxation behavior, the cyclic softening or hardening and the translation of the yield surface, while it ignores the effect of the strain rate. Time-dependent models include Johnson-Cook and the two-layer... 

    Effects of Bending on Forming Limit Diagram (FLD)Based on Marciniak & Kuczynski Method

    , M.Sc. Thesis Sharif University of Technology Ehtiati, Saeed (Author) ; Asempour, Ahmad (Supervisor)
    In designing sheet forming processes, finding out the value of the maximum strain before necking in sheets is extremely important. Therefore, many experimental and theoretical efforts have been carried out in order to answer this question. One of the most well-known and useful theoretical methods in this regard is the Marciniak - Kuczynski method which was introduced in 1967 and is still the topic of many researches. In this model, it is assumed that a groove as a defect primarily exists in the sheet and due to the weakness of this region, necking will initiate. Furthermore, the effects of various parameters such as sensitivity to strain rate, strain path, thickness, three dimensional... 

    Analysis of The Middle Ear in Sound Transmission

    , M.Sc. Thesis Sharif University of Technology Almasian, Milad (Author) ; Ahmadian, Mohammad Taghi (Supervisor)
    The ossicular chain of the human middle ear has a key role in sound conduction since it transfers vibrations from the tympanic membrane to the cochlea, connecting the outer and the inner part of the hearing organ. This study reports firstly a description of the main anatomical features of the middle ear to introduce a detailed survey of its biomechanics,focused on model development, with a collection of geometric, inertial and mechanical/material parameters. The joint issues are particularly discussed from the perspective of developing a model of the middle ear both explanatory and predictive. Such a survey underlines the remarkable dispersion of ... 

    Dynamic Characteristics Analysis of Drill-String in Deviated Oil Well

    , M.Sc. Thesis Sharif University of Technology Zoveidanian, Soheil (Author) ; Ghaemi Osgouie, Kambiz (Supervisor) ; Salarieh, Hassan (Co-Advisor)
    Oil field industry is one of the most challenging engineering subjects. In oil well drilling, undesired motion could raise a lot of problems such as stuck pipes; wash out pipe, and etc. In this industry, motion prediction is very important because a good prediction can avoid instruments failure and as a result considerable amount of time could be saved. Predicting dynamic characteristics of drill-string such as whirl orbit, whirl speed, and axial, lateral, and torsional displacements, accelerations, and velocities, might be useful in avoiding or decreasing failures. A program based on FEM (Finite Element Method) is developed in MATLAB considering deviation of drill-string, contacting with... 

    Numerical Modeling of Dynamic Instability in Soil Slopes and its Effect on the Response of Buried Pipelines

    , M.Sc. Thesis Sharif University of Technology Shahrabi, Mohammad Mahdi (Author) ; Jafarzadeh, Fardin (Supervisor)
    In this study, three dimensional analysis of soil slopes subjected to dynamic loading was conducted in order to investigate the interaction of soil-pipe system. For modeling of soil behavior, strain-dependent nonlinear elasticity along with Mohr-Coulomb plasticity was defined to the material and elasto-plastic behavior was used for the pipes. For dynamic modeling of soil slopes and analysis of buried pipelines, a Finite-Element-based software, ABAQUS was utilized. In this regard, first the numerical model was calibrated and verified based on the results obtained by physical shaking-table tests on a soil slope. Afterwards, a comparison was made between the results of numerical models and some... 

    Numerical Study on the Post-earthquake Fire Behavior of Intermediate Steel Moment Frames

    , M.Sc. Thesis Sharif University of Technology Parvizi Zadeh, Shayan (Author) ; Kazemi, Mohammad Taghi (Supervisor)
    Nowadays, proper design and retrofitting of structures against natural and manmade disasters, is among the main concerns of researchers and designers in order to reduce financial and human costs. Extensive research has been carried out on the structures resistance against earthquake up to now. Although, the vast amount of research has resulted various regulations and guidelines, there is still a long way ahead to achieve the desirable results. Due to high sensitivity of the steel to temperature variations, fire exposure is more destructive for steel structures compared with the concrete ones. The performance of an intermediate three-storey steel moment frame with 4 spans was studied in this... 

    Numerical Analysis of Buried Pipelines in Soil Slopes Subjected to Dynamic Loadings

    , M.Sc. Thesis Sharif University of Technology Seyed Joodat, Hanie (Author) ; Jafarzadeh, Fardin (Supervisor)
    In this study, the seismic response analysis of a buried pipeline had been performed using three-dimensional (3D) dynamic analysis of the soil-pipeline interaction under different loading inputs. A number of parameters such as properties of the buried pipeline including diameter and internal pressure and different loading frequencies were used for this investigation. The pipe was considered as an elastoplastic material and a nonlinear elastic material based on the Mohr–Coulomb criterion was used to model the soil behavior. In addition, pipe-soil interaction has been studied in both tangential and vertical directions. The ABAQUS software was utilized for the 3D numerical modeling and... 

    Lateral Buckling Analysis of Offshore Pipelines

    , M.Sc. Thesis Sharif University of Technology Heidari, Hamed (Author) ; Ghoreishi, Reza (Supervisor) ; Abbaspour, Madjid (Supervisor)
    This project deals with the global buckling in high pressure/high temperature (HP/HT) subsea pipelines. Some subsea pipelines are laid directly on the seabed. Large axial forces will generally cause an exposed pipeline to buckle sideways, or laterally, on the seabed. Pipelines may significantly expand during start-up and shutdown cycles, resulting in global buckle formation with high out-of-straightness (OOS).This global buckling behavior may be unacceptable if it is not properly managed. Global buckling mitigation can be achieved by providing controlled lateral movements of pipeline. Buckle mitigation devices are installed along the pipeline to provide buckle initiation sites, there by... 

    Three Dimensional Dynamic Response of Buried Pipielines Due to Earthquake Induced Landslides by Numerical Modeling

    , M.Sc. Thesis Sharif University of Technology Sahragard Jouneghani, Faranak (Author) ; Jafarzadeh, Fardin (Supervisor)
    The purpose of this research is to study the effect of using expanded polystyrene (EPS) Geofoam to retrofit buried pipelines in slopes subjected to landslide due to earthquakes.For this purpose, several 3D numerical models were built with ABAQUS/CAE based on physical model tests conducted on shaking table device at Sharif University of Technology by previous research groups. Two parts are considered in this study. in the first part, three tests were simulated. Displacements, acceleration time histories and strains of pipes were compared to the tests results and the effect od EPS block on each pipe pesponse was observed. In the second part, effect of two factors on response of buried pipes... 

    Study of the Effect of Strip Opening on the Sides of the Steel Plate Shear Wall

    , M.Sc. Thesis Sharif University of Technology Kavei, Sina (Author) ; Khaloo, Alireza (Supervisor)
    One of the lateral-load bearing systems that has been recommended since almost 40 years ago is the steel plate shear wall (SPSW) system, which consists of a steel plate surrounded by beams and columns in each story. As for the performance of SPSWs, it is assumed that the boundary members of the wall’s plate, i.e. beams and columns, have sufficient stiffness and strength, so that they would not yield by the tensile stresses exerted due to the post-buckling behavior of the plate (tension field); and the global stability of the structure is still maintained. This assumption leads to significantly increased dimensions of the sections applied in the wall’s boundary members, particularly its...