Shiraz University
Iranian Journal of Materials Forming
2383-0042
5
2
2018
10
01
Ten years of severe plastic deformation (SPD) in Iran, part II: accumulative roll bonding (ARB)
1
25
EN
M.
Reihanian
0000-0003-4618-5509
Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University, Ahvaz, Iran
m.reihanian@scu.ac.ir
E.
Bagherpour
0000-0002-7405-1949
Department of Materials Science and Engineering, Shiraz University, Shiraz, Iran
ebad.bagherpour@brunel.ac.uk
N.
Pardis
Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz, Iran
pardis@shirazu.ac.ir
R.
Ebrahimi
0000-0001-8057-5733
Department of Materials Science and Engineering, School of Engineering, Shiraz University, Iran.
ebrahimy@shirazu.ac.ir
Nobuhiro
Tsuji
Department of Materials Science and Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan
nobuhiro-tsuji@mtl.kyoto-u.ac.jp
10.22099/ijmf.2018.29910.1102
The present paper is the second part of a previously published overview entitled “ten years of severe plastic deformation (SPD) in Iran”. Part I concentrates on the equal channel angular pressing (ECAP). In this part, the focus is on the accumulative roll bonding (ARB) because, currently, Iran is ranked the first in the world by the total number of publications in this field. In the present section, the emphasis is not on the microstructure and ultrafine-grained materials produced by ARB. Instead, its focus is on several aspects of ARB to which small attention has been paid so far. The impact and contribution of Iran to each category is evaluated in comparison to researchers from other countries. The main interest of Iranian researchers in the field of ARB is to fabricate the composite materials, particularly metal matrix composites (MMCs). The Iranian researchers were the first who introduced ARB as an effective method to produce particulate MMCs.
severe plastic deformation,accumulative roll bonding (ARB),Ultrafine-grained materials,properties
https://ijmf.shirazu.ac.ir/article_5001.html
https://ijmf.shirazu.ac.ir/article_5001_c609340dc3cab9becd5032fab9f12dfe.pdf
Shiraz University
Iranian Journal of Materials Forming
2383-0042
5
2
2018
10
01
Finite element simulation of two-point incremental forming of free-form parts
26
35
EN
M.
Esmailian
Department of Mechanical Engineering, University of Birjand, Birjand, Iran
mojtaba@birjand.ac.ir
Kh.
Khalili
Department of Mechanical Engineering, University of Birjand, Birjand, Iran
kkhalili@birjand.ac.ir
10.22099/ijmf.2018.29389.1100
Two-point incremental forming method is considered a modern technique for manufacturing shell parts. The presence of bottom punch during the process makes this technique far more complex than its conventional counterpart i.e. single-point incremental forming method. Thus, the numerical simulation of this method is an essential task, which leads to the reduction of trial/error costs, predicts the tearing of sheet and investigates various aspects of this complex method. Most of the previous works regarding numerical simulation of incremental forming method have concentrated on the single-point type of this technique. Moreover, all of these simulations have considered simple geometries like truncated cone, truncated hemisphere and truncated regular pyramid, which are based on well-known mathematical functions. In this study, a novel simplified procedure is presented for the finite element simulation of two-point incremental forming of free-form parts. The procedure is based on the extraction of tool-path points by using CAM software and the finite element model. In the current study, it will be shown how simulated results can be applicable for gaining useful information about the tearing of deforming sheets, selecting suitable numerical machines for practical forming processes and the deformation quality of sheets.
Two-point incremental forming,Finite element method,Numerical simulation,Free-form
https://ijmf.shirazu.ac.ir/article_5002.html
https://ijmf.shirazu.ac.ir/article_5002_3ef09b2c051c53533a3e99601bf0603b.pdf
Shiraz University
Iranian Journal of Materials Forming
2383-0042
5
2
2018
10
01
Forming of Multi layer Sheet Metal by Drawing Process: an Analysis and FEM Simulation
36
53
EN
Y.
Mollapour
Department of Mechanical engineering, University of Zanjan, Zanjan, Iran
mollapouryousef@znu.ac.ir
D.
Afshari
Department of Mechanical engineering, University of Zanjan, Zanjan, Iran
dafshari@znu.ac.ir
H.
Haghighat
Department of Mechanical Engineering, Razi University, Kermanshah, Iran
hhaghighat@razi.ac.ir
10.22099/ijmf.2018.30104.1106
In this paper, the drawing process of multi-layer sheet metal through wedge shaped die has been analyzed using stream function and upper bound method. Typically a sandwich sheet contains three layers of metal, where the outer layers are of the same thickness and material and different from those of the inner layer. In this study, a new deformation model has been introduced in which inlet and outlet shear boundaries are considered flexible and the effect of work hardening of sheet layer materials has been considered. According to the suggested stream function, velocity field, strain rates and powers have been calculated. The optimized geometry of deformation zone and required drawing force has been determined depending on the process conditions. Analytical results, including drawing force and thickness of sheets in outlet of die have been compared with the finite element (FE) results. The FE results have a good agreement with the analytical results. Finally, the effects of friction factor and reduction in thickness have been investigated on the drawing force and the optimum die angle.
Upper bound,Work hardening,Sheet Drawing,Deformation zone,Stream function
https://ijmf.shirazu.ac.ir/article_5003.html
https://ijmf.shirazu.ac.ir/article_5003_51e1f8a82f471c8b9d2e972b9f219d70.pdf
Shiraz University
Iranian Journal of Materials Forming
2383-0042
5
2
2018
10
01
Determination of Residual Stress for Single and Double Autofrettage of Thick-walled FG Cylinders Subjected to Dynamic Loading
54
71
EN
S. H.
Razi Mousavi
School of Mechanical Engineering, Shiraz university, Shiraz, Iran
h.razi@shirazu.ac.ir
M.
Mahzoon
School of Mechanical Engineering, Shiraz university, Shiraz, Iran
mahzoon@shirazu.ac.ir
M. H.
Kadivar
School of Mechanical Engineering, Shiraz university, Shiraz, Irany
kadivar@shirazu.ac.ir
10.22099/ijmf.2018.30353.1107
In the present article a numerical procedure is developed for dynamic analysis of single and double autofrettage of thick–walled FG cylinders under transient loading. The governing differential equations are discretized and presented in explicit Lagrangian formalism. The explicit transient solution of discrete equations are obtained on the meshed region and results for stress and strain distribution for relevant problems under inner and/or outer boundary conditions are established.<br />The autofrettage behavior is subsequently analyzed through the application of time dependent pressure at boundary regions of the axisymmetric domain. Dynamic results, in particular in transient loading, are different in comparison with static ones due to the presence of plastic deformation and wave propagation. The residual stress resulting from internal pressure changes structural load bearing capacity of the cylinder in so far as the tensile stress of the outer layers might reduce while compressive stress of the inner layers increase. For functionally graded materials whose material properties change continuously, dynamic analysis yields results which are entirely different as compared with their static counterparts due to the change in wavelength and acoustic impedance. In the static analysis, the dimensionless forms of equations can be developed from the onset, while in the dynamic analysis the physical dimensions and material properties gain importance due to inherent properties of the stress waves. Residual stresses in the inner and outer parts of the cylinder are also studied for various volume fractions of FG material under single or double autofrettage.
FG Cylinder,Double Autofrettage,Dynamic Simulation,Time Dependent Loading,Residual Stress
https://ijmf.shirazu.ac.ir/article_5004.html
https://ijmf.shirazu.ac.ir/article_5004_5156ad2507d6cf5aaf98addcc054663f.pdf
Shiraz University
Iranian Journal of Materials Forming
2383-0042
5
2
2018
10
01
Multi-objective Pareto optimization of bone drilling process using NSGA II algorithm
72
83
EN
V.
Tahmasbi
Department of Mechanical Engineering, Arak University of Technology, Arak, Iran
vtahmasbi@mail.kntu.ac.ir
H.
Safikhani
Department of Mechanical Engineering, Arak University, Arak, Iran
h-safikhani@araku.ac.ir
F.
Setoudeh
Department of Electrical Engineering, Arak University of Technology, Arak, Iran
f.setoudeh@arakut.ac.ir
10.22099/ijmf.2018.29391.1099
Bone drilling process is one the most common processes in orthopedic surgeries and bone breakages treatment. It is also very frequent in dentistry and bone sampling operations. Bone is a complex material and the machining process itself is sensitive so bone drilling is one of the most important, common and sensitive processes in Biomedical Engineering field. Orthopedic surgeries can be improved using robotic bone drilling systems and mechatronic bone drilling tools. In the present study, multi-objective optimization is performed on the temperature and trust force at two steps. At the first step, two regression models are developed for modeling the temperature and force in bone drilling process considering three design variables namely tool’s rotational speed (V), feed rate (f) and tool diameter (D). At the second step, by using regression models, multi-objective genetic algorithm is used for Pareto based optimization of bone drilling process considering two conflicting objectives: temperature and force. It has been found out that there are considerable connections and feasible principles for an optimal design of the process in case of applying Pareto-based multi-objective optimization; otherwise these interesting results would not be discernible.
Pareto optimization,bone drilling,temperature,thermal necrosis,NSGA II
https://ijmf.shirazu.ac.ir/article_5005.html
https://ijmf.shirazu.ac.ir/article_5005_ff49f0c569eccc49dbd14227de0fe60e.pdf
Shiraz University
Iranian Journal of Materials Forming
2383-0042
5
2
2018
10
01
Effect of friction stir welding parameters on the ultimate tensile strength of Al-Cu tailor welded blanks
85
95
EN
R.
Safdarian
Department of Mechanical Engineering, Behbahan Khatam Alanbia University of Technology, Behbahan, Khoozestan, Iran
safdarian_rasool@yahoo.com
O.
Habibian Tavan
National Iranian Oil Company, Oil & Amp;Gas Production South Company, Gachsaran, Iran
rasoolsaf@gmail.com
10.22099/ijmf.2018.29013.1098
In the present study, parameters of tool rotation speed, tool travel speed and tool offsetting with different levels were used in the friction stir welding (FSW) of aluminum-copper tailor welded blanks (TWBs). The FSW of pure copper to 5052 aluminum alloy were carried out by varying tool rotation speed from 800 rpm to 1200 rpm, tool travel speed from 40 mm/min to 80 mm/min and tool offsetting from 1 mm to 2 mm. The L9 orthogonal array of Taguchi was used to design 9 experimental tests and each test was repeated three times. The uniaxial tensile test based on the ASTM-E8 was used for mechanical properties extraction of TWBs. The tool rotation speed of 1200 rpm, tool travel speed of 60 mm/min and tool offsetting of 1.5 mm resulted in the optimum range of heat input to form a stir zone with good quality. Using these FSW parameters caused the formation of thin intermetallic layers which stopped the motion of dislocation in the tensile test and resulted in higher tensile strength and joint quality. The scanning electron microscope (SEM) was used to scan the tensile fracture surface of TWBs.
TWBs,FSW,Mechanical properties,Ultimate tensile strength,Microstructure
https://ijmf.shirazu.ac.ir/article_5006.html
https://ijmf.shirazu.ac.ir/article_5006_ee0fe6000295420fd27d4bc8c21c949a.pdf
Shiraz University
Iranian Journal of Materials Forming
2383-0042
5
2
2018
10
01
A hybrid approach based on numerical, statistical and intelligent techniques for optimization of tube drawing process to produced squared section from round tube
96
109
EN
M.
Ghasempour Mouziraji
Department of mechanical engineering, Islamic Azad university if Sari. Sari.Iran
mehran_ghasempour20@yahoo.com
M.
Hosseinzadeh
Department of mechanical engineering, Ayatollah Amoli Branch, Islamic Azad university, Amol, Iran
m_hoseinzadeh59@yahoo.com
M.
Bakhshi-Jooybari
Babol Noshirvani University of Technology
bakhshi@nit.ac.ir
J.
Maktoubian
International School of Information Management (ISIM), University of Mysore, Mysore, India
jamal.maktoubian@gmail.com
10.22099/ijmf.2018.26125.1088
In the tube drawing process, there are a bunch of parameters which play key role in process performance. Thus, finding the optimized parameters is a controversial issue. Current study aimed to produce a squared section of round tube by tube sinking process. To simulate the process finite element method (FEM) was used. Then, to find a meaningful kinship between process input and output parameters the developed FE model was associated with the design of experiment based response surface methodology (RSM). The sufficiency of each model was checked by analysis of variances. Further, the SA (simulated annealing) was associated with RSM models to find the optimal solution regarding maximum thickness distributions and minimum force and dimensional error. Hereafter, for performing accurate optimization, the principal component analysis was used to find the appropriate weight factor of each response. The obtained results were in right agreement with those derived from simulation and confirmatory experiment.
Tube sinking,squared sections,Multi-objective optimization
https://ijmf.shirazu.ac.ir/article_5033.html
https://ijmf.shirazu.ac.ir/article_5033_5fad5cec3290cf7dc0230d238e1abe1e.pdf