Search for: deposition-models
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    Integrated modelling methods for asphaltene deposition in wellstring

    , Article Journal of the Japan Petroleum Institute ; Volume 47, Issue 1 , 2004 , Pages 27-31 ; 13468804 (ISSN) Soulgani, B. S ; Rashtchian, D ; Tohidi, B ; Jamialahmadi, M ; Sharif University of Technology
    Asphaltene precipitation and deposition is one of the main problems in some of the oil fields. The deposited asphaltene results in partial or total blockage of the wellstring and reducing or completely seizing oil production. Asphaltene deposition problems have been experienced in the field for a long time. Although, the asphaltene precipitation has been studied thoroughly and different parameters that effects this process has been investigated but little work has been carried out in the asphaltene deposition across the production system of flowing oil well. This paper introduces a new comprehensive model for description of asphaltene deposition behavior in wellstring. The mechanisms of... 

    An Estimation Model for Computation and Control of Trajectory Coverage Error in Additive Manufacturing

    , M.Sc. Thesis Sharif University of Technology Zargar, Farinaz (Author) ; Houshmand, Mahmood (Supervisor)
    During 1980s Additive Manufacturing technologies for the purpose of prototyping with fast and less expensive, under the name of Rapid Prototyping was invented. But nowadays under the vast progress made in this field, it possesses a notable place in different industries such as automobile manufacturing, aerospace, architecture, medicine and so on for part manufacturing. In all AM machines, the CAD model design part is manufactured by adding layered to each other. In this research, at first by explaining manufacturing process and current different technologies, the place of this manufacturing process in today and future industry, is analyzed. For discussing replacement of this method instead... 

    Fabrication of Micron Resolution Polymer Structures with Electrohydrodynamic Printing

    , M.Sc. Thesis Sharif University of Technology Shahverdi, Mohammad (Author) ; Movahedi, Mohammad Reza (Supervisor)
    In recent years, additive manufacturing has been widely used in prototyping and production of industrial-commercial pieces. Additive manufacturing or three-dimensional (3D) printing is able to easily produce any piece for initial prototyping, no matter how complex it is. The fused deposition modeling (FDM) is a type of additive manufacturing process that produces the piece with the mechanism of feeding the PLA filament, then the molten polymer extrusion and depositing the fluid layer by layer with a high viscosity. Since the thickness of the layers is directly proportional to the diameter of the nozzle and the diameter of the used nozzles cannot be in the micron range (lower than 100... 

    Asphaltene deposition in carbonate rocks: Experimental investigation and numerical simulation

    , Article Energy and Fuels ; Volume 26, Issue 10 , June , 2012 , Pages 6186-6199 ; 08870624 (ISSN) Kord, S ; Miri, R ; Ayatollahi, S ; Escrochi, M ; Sharif University of Technology
    Oil production from asphaltenic oil reservoirs has always encountered difficulties, such as plugging and unpredictable fluid properties. To physically recognize the aspects of asphaltene deposition, several dynamic and static asphaltene deposition tests were designed and performed on one of the giant south Iranian oil reservoirs using dead and live crude oil and real core samples. Moreover, the effects of fluid velocity on the extent of damage were investigated. It was found that surface deposition of asphaltene particles is the main source of formation damages in the porous media and the resulting permeability impairment obeys an exponential behavior. All of the experiments confirm that... 

    Plasticity in polymeric honeycombs made by photo-polymerization and nozzle based 3D-printing

    , Article Polymer Testing ; Volume 63 , 2017 , Pages 163-167 ; 01429418 (ISSN) Goodarzi Hosseinabadi, H ; Bagheri, R ; Avila Gray, L ; Altstädt, V ; Drechsler, K ; Sharif University of Technology
    Study of the plastic deformation in polymeric honeycombs can pave the way for understanding the deformation localization in more complex cellular structures, which have received progressive attention in the past few years. This study compares the strain localization in deforming honeycombs made by two cost-effective 3D-printing technologies. Hexagonal honeycombs and their unit cell models were 3D-printed by both PolyJet™, using a photo-crosslinkable polymer, and fused deposition modeling (FDM) using a thermoplastic material. The state of the art digital image correlation (DIC) technique was employed as the experimental route in order to calculate the strain field during the deformation of... 

    Experimental and Numerical Investigation on Mechanical Properties of Continuous Fiber Reinforced Parts Fabricated with FDM Additive Manufacturing Method

    , M.Sc. Thesis Sharif University of Technology Arjmandi, Mohammad (Author) ; Yousefi, Reza (Supervisor) ; Kouchakzadeh, Mohammad Ali (Supervisor)
    With advancement of science of aircraft design and limitations of traditional manufacturing methods, using new ones in order to improve efficiency is needed. Among those methods to improve structure efficiency are weight reduction or increase in strength. Increasing strength-to-weight ratio and reduction of weight could be achieved by using composite materials and topology optimization respectively. Manufacturing such parts with efficient design using traditional methods is hard or impossible. Additive manufacturing as a new technology which is being developed every day, can be a big help to aerospace industry. Considering the importance of strength-to-weight ratio in aerospace industry and... 

    Shear band propagation in honeycombs: numerical and experimental

    , Article Rapid Prototyping Journal ; Volume 24, Issue 2 , 2018 , Pages 477-484 ; 13552546 (ISSN) Goodarzi Hosseinabadi, H ; Bagheri, R ; Altstadt, V ; Sharif University of Technology
    Emerald Group Publishing Ltd  2018
    Purpose: Hexagonal honeycombs with meso-metric cell size show excellent load bearing and energy absorption potential, which make them attractive in many applications. However, owing to their bend-dominated structure, honeycombs are susceptible to deformation localization. The purpose of this study is to provide insight about shear band propagation in struts of 3D-printed honeycombs and its relation to the achieved macroscopic mechanical behavior. Design/methodology/approach: Hexagonal honeycombs and unit cell models are 3D-printed by fused deposition modeling (FDM). The samples are exposed to compression loading and digital image correlation technique and finite element analyses are... 

    An alternative additive manufacturing-based joining method to make Metal/Polymer hybrid structures

    , Article Journal of Manufacturing Processes ; Volume 45 , 2019 , Pages 217-226 ; 15266125 (ISSN) Ozlati, A ; Movahedi, M ; Tamizi, M ; Tartifzadeh, Z ; Alipour, S ; https://www.sciencedirect.com/science/article/abs/pii/S1526612519302087
    Elsevier Ltd  2019
    Fused Deposition Modeling with Polypropylene filament was employed to make a lap joint between Polypropylene and pre-punched Al-Mg alloy sheets, in the form of bonds between the polymeric substrate and the additive part and mechanical lock between the additive part and aluminum base sheet. Effects of the joint interface area (hole diameter of 5–13 mm) and preheating of the substrates (room temperature, 50 and 90℃) were investigated on the mechanical properties of the joints. Peak load in the tensile-shear and cross-tension tests increased with enhancement of the joint interface area (up to ˜280 N and ˜160 N, respectively). Higher joint strength in the tensile-shear test compared to the...