Fluoride Ions Removal using Yttrium Alginate Biocomposite from an Aqueous Solution (RESEARCH NOTE)
Mohammadreza
Kosari
Department of Energy Engineering, Sharif University of Technology
author
Hamid
Sepehrian
author
text
article
2017
eng
Removal of fluoride ions was investigated using a new adsorbent of yttrium alginate biocomposite (YALG). Effect of various parameters such as pH, contact time, initial concentration of fluoride ions and temperature on the sorption capacity of adsorbent was studied. Performing a mathematical assessment of fluoride sorption, isotherm and kinetics models including Freundlich & Langmuir isotherms and pseudo first & second order kinetics were applied on experimental equilibrium results through this work. Isotherm analysis revealed that Langmuir model showed a better evaluation from sorption equilibrium data than Freundlich. Based on kinetics evaluation, the pseudo second-order equation was capable of fitting the sorption data satisfactorily compared to the pseudo first-order model. The maximum sorption capacity of fluoride ions (q, mg.g-1) using the YALG was found to be 147.05 mg.g-1. Regarding the thermodynamic studies and its parameters (i.e. ΔH°, ΔS° and ΔG°) it is revealed that the fluoride ions adsorption using nanoporous YALG was feasible, spontaneous and endothermic in nature.
International Journal of Engineering
Materials and Energy Research Center
1025-2495
30
v.
1
no.
2017
1
6
https://www.ije.ir/article_72854_7800e03175b3f5d6b6933954acd8f648.pdf
Fabrication and Characterization of Novel Mixed Matrix Polyethersulfone Based Nanofiltration Membrane Modified by Ilmenite (TECHNICAL NOTE)
Abdolreza
Moghadassi
Chemical Engineering, Arak University
author
Alireza
Hamidi
Chemical Engineering, Arak University
author
Sayed
Hosseini
Chemical Engineering, Arak University
author
Ehsan
Bagheripour
Chemical Engineering, Arak University
author
text
article
2017
eng
This study is focused on fabrication and characterization of mixed matrix poly ether sulfone based nanofiltration membrane by phase inversion method. The effect of different amounts of Ilmenite (FeTiO3) particles as inorganic filler additive in the casting solution on physic-chemical characteristics of membranes was studied. Scanning electron microscopy, surface analysis, water content, contact angle, permeation, rejection and tensile strength measurements were carried out in membrane characterization. SEM images showed asymmetric structures with a dense top layer and porous sub-layer for the membranes. Images revealed that membrane sub-layer porosity increased and top-layer thickness decreased by FeTiO3 utilizing in membrane matrix. SEM images showed smooth surface for modified membranes compared to pristine one. Membrane water content improved initially by increase of additive concentration up to 0.05 wt% into the casting solution and then decreased. The contact angle measurements showed that membrane surface hydrophilicity improved using Ilmenite in the membrane matrix. The membrane tensile strength improved initially by increasing additive concentration into the casting solution and then decreased. Utilizing of Ilmenite into the membrane matrix caused increase of water flux and salt rejection from 10 to 172.4 L/m2·h and 53.9 to 88.5%, respectively.
International Journal of Engineering
Materials and Energy Research Center
1025-2495
30
v.
1
no.
2017
7
14
https://www.ije.ir/article_72855_6e364b7fd2a34b1b42d1322590a55012.pdf
Photochemical Degradation of 2,4-dichlorophenol in Aqueous Solutions by Fe2+/ Peroxydisulfate/ UV Process
Azita
Mohagheghian
environmental engineering, Guilan University of Medical Mciences
author
Daryoosh
Naghipour
environmental engineering, Guilan University of Medical Mciences
author
mehrdad
moslemzadeh
environmental engineering, Guilan University of Medical Mciences
author
Kamran
Taghavi
environmental engineering, Guilan University of Medical Mciences
author
text
article
2017
eng
Phenol and its derivatives are one of the most common contaminants in the aquatic ecosystem. Because of high toxicity of 2,4-DCP for aquatic life, resistance to biodegradation and potential for biological accumulation it is known as a priority contaminant in the aquatic environment. Advanced Oxidation Processes were successfully used for degradation of non-biodegradable contaminants that are resistant to conventional treatment processes. So, it would be interesting that advance oxidation technologies was used which apply such effective radicals as radicals (SȮ4). In present study, effects of concentrations of 2,4-DCP, Fe2+, peroxydisulfate (PDS) and pH value were investigated on the 2,4-DCP photochemical degradation efficiency. The increase of pH value negatively influenced the removal efficiency and reaction rate constant while an increase in the Fe2+ and (PDS) concentrations increased both the removal efficiency and reaction rate constant. In addition, the reaction rate constant increased linearly with increasing (PDS) concentration. In this study, in general, PDS was found as the most effective factor on the degradation of 2,4-DCP by Fe2+/PDS/UV.
International Journal of Engineering
Materials and Energy Research Center
1025-2495
30
v.
1
no.
2017
15
22
https://www.ije.ir/article_72856_04ecdc087bf33a64e280304aae7b80c7.pdf
Enhanced Predictions of Tides and Surges through Data Assimilation (TECHNICAL NOTE)
Rama
Karri
Petroleum and Chemical Engineering, Universiti Teknologi Brunei
author
Babovic
Vladan
Department of Ci, National University of Singapore
author
text
article
2017
eng
The regional waters in Singapore Strait are characterized by complex hydrodynamic phenomena as a result of the combined effect of three large water bodies viz. the South China Sea, the Andaman Sea, and the Java Sea. This leads to anomalies in water levels and generates residual currents. Numerical hydrodynamic models are generally used for predicting water levels in the ocean and seas. But their correctness is typically limited by several factors, namely the complexity associated with the coastal geometry and uncertainty in the flow forcing factors like (winds, pressure and deep ocean tides). Modeling of ocean dynamics in the Malacca strait and Singapore regional waters is particularly challenging due to the presence of large number of smaller islands and strongly nonlinear tidal interactions. The complexity is further enhanced due to the composite local bathymetry and geometry variations around the Singapore Island and meteorological effects on different scales. This study acknowledges the enhancement and better prediction of tides and surges through the use of data assimilation. Through a portable interface OpenDA, an ensemble Kalman filter is integrated with a hydrodynamic model to enhance the model predictions. To assess the sensitivity and evaluate model enhancement, a twin experiment is designed to improve tidal boundary forcing effect in a semi-enclosed estuary. The key outcomes of this study signify that the model results can be significantly improved in this complex flow regime.
International Journal of Engineering
Materials and Energy Research Center
1025-2495
30
v.
1
no.
2017
23
29
https://www.ije.ir/article_72857_fc6132a18d0f823758e5a15f8436a839.pdf
Free Vibration Analysis of a Six-degree-of-freedom Mass-spring System Suitable for Dynamic Vibration Absorbing of Space Frames
Seyed Mojtaba
Hozhabrossadati
author
Ahmad
Aftabi Sani
CE, FUM
author
M.
Rezaiee Pajand
author
text
article
2017
eng
This study is concentrated on the natural frequencies and mode shapes of a simple three-member space frame coupled with a dynamic vibration absorber. The dynamic vibration absorber is modeled as a six-degree-of-freedom mass-spring system. For the first time, the free vibration of an elastic structure with a six-degree-of-freedom mass-spring system is found. Each member of the space frame has uniform mechanical and geometrical properties, but these may differ from one member to another. The exact result of this complex problem is obtained via analytical scheme and finite element method. All effects of the axial and torsional deformations and also in- and out-of-plane bending are taken into account. This formulation includes eighteen differential equations along with thirty six boundary and compatibility conditions. Comparison of the results by both approaches mentioned above, illustrates the accuracy of our solutions. Findings are useful benchmarks for the natural frequencies and mode shapes of the space frame coupled with a dynamic vibration absorber.
International Journal of Engineering
Materials and Energy Research Center
1025-2495
30
v.
1
no.
2017
30
39
https://www.ije.ir/article_72858_6476eb0917281109bdab1e7284fb3c44.pdf
Effects of Partial Substitution of Styrene-butadiene-styrene with Granulated Blast-furnace Slag on the Strength Properties of Porous Asphalt
Seyed Morteza
Marandi
Civil Engineering, Shahid Bahonar University of Kerman
author
Mojtaba
Ghasemi
Civil Engineering and Surveying,, Graduate University of Advanced Technology, Kerman
author
Jaber
Shahiri
Civil Engineering and Surveying,, Graduate University of Advanced Technology, Kerman
author
text
article
2017
eng
The present experimental research investigates the feasibility of partial substitution of styrene-butadiene-styrene (SBS) with ground granulated blast-furnace slag (GGBS) for the modification of bitumen and porous asphalt mixtures. The control asphalt mixture and the seven modified porous asphalt mixtures have been analyzed separately and their performance was compared. Modified bitumen and asphalt mixtures were evaluated based on the penetration test, softening point, ductility, Marshall stability, indirect tensile strength (ITS), moisture susceptibility, uniaxial compression test, porosity, and permeability. According to the results, a blend of GGBS and SBS can be used to modify porous asphalt mixtures since it either improves or does not change their properties. The results show that using these additives have decreased penetration and ductility of bitumen and also there is an increase in softening point, so that the additives have strengthened asphalt mixture properties such as Marshall strength, ITS and Uniaxial compression strength. Furthermore, in the current research work, artificial neural networks (ANN) are used to estimate the permeability of modified porous asphalt mixtures. Sensitivity analysis was discussed for the measurement of the importance of different input parameters. The laboratory experiments and proposed ANN model indicated that a new method can be developed for permeability control.
International Journal of Engineering
Materials and Energy Research Center
1025-2495
30
v.
1
no.
2017
40
47
https://www.ije.ir/article_72859_22a5057426e96f00efbf427f8aaf480f.pdf
Parallel Implementation of Particle Swarm Optimization Variants Using Graphics Processing Unit Platform
S.
Jam
Department of Computer Eng., University of Guilan
author
A.
Shahbahrami
Computer Engineering, University of Guilan
author
S. H.
Sojoudi Ziyabari
Department of Computer Eng., University of Guilan
author
text
article
2017
eng
There are different variants of Particle Swarm Optimization (PSO) algorithm such as Adaptive Particle Swarm Optimization (APSO) and Particle Swarm Optimization with an Aging Leader and Challengers (ALC-PSO). These algorithms improve the performance of PSO in terms of finding the best solution and accelerating the convergence speed. However, these algorithms are computationally intensive. The goal of this paper is high performance implementations of Traditional PSO (TPSO), APSO and ALC-PSO using CUDA technology. We have implemented these three algorithms on both central processing unit (CPU) and graphics processing unit (GPU) in order to analyze and improve their performance and reduce their computational times. We have achieved speedups up to 14.5x, 31x, and 152x, for GPU-TPSO , GPU-ALCPSO , and GPU-APSO, respectively. In addition, different number of threads has been chosen in order to find an appropriate number of threads per block for both APSO and ALC-PSO algorithms. Our experimental results show that the best choice for number of threads per block depends on the number of existing variables and constants in each algorithm and the number of registers per multiprocessor.
International Journal of Engineering
Materials and Energy Research Center
1025-2495
30
v.
1
no.
2017
48
56
https://www.ije.ir/article_72860_c25bc258c8c4d72bf9ab9d9e21f1daa8.pdf
Field Programmable Gate Array–based Implementation of an Improved Algorithm for Objects Distance Measurement (TECHNICAL NOTE)
mohammad hossein
Doost Mohammadi
Electrical Engineering, Hamedan University of Technology (HUT)
author
Mohammad
Soleimani
, Hamedan University of Technology (HUT)
author
Hossein
Zivarian
, Hamedan University of Technology (HUT)
author
text
article
2017
eng
In this work, the design of a low-cost, field programmable gate array (FPGA)-based digital hardware platform that implements image processing algorithms for real-time distance measurement is presented. Using embedded development kit (EDK) tools from Xilinx, the system is developed on a spartan3 / xc3s400, one of the common and low cost field programmable gate arrays from the Xilinx Spartan family. Latency of the hardware is less than 100μs in 5000 clock cycles with 50MHz maximum frequency which is way less than MATLAB software performance about 82ms. Simulation and experimental results clearly indicate the potential of the presented FGPA-based platform for real-time distance measurement of images acquired from our camera setup. Thus, this platform can be used in any system with the needs of real-time or semi real-time machine vision.
International Journal of Engineering
Materials and Energy Research Center
1025-2495
30
v.
1
no.
2017
57
65
https://www.ije.ir/article_72861_d0f6989083d50e004a514e4b1078a044.pdf
Risk Analysis of Operating Room Using the Fuzzy Bayesian Network Model
Mustapha
AMGHAR
, EMI
author
Bouchra
ZOULLOUTI
Process engineering, EMI, Mohammadia school of engineering
author
Nawal
SBITI
, EMI
author
text
article
2017
eng
To enhance Patient’s safety, we need effective methods for risk management. This work aims to propose an integrated approach to risk management for a hospital system. To improve patient’s safety, we should develop flexible methods where different aspects of risk and type of information are taken into consideration. This paper proposes a fuzzy Bayesian network to model and analyze risk in the operating room. Bayesian networks provide a framework for presenting causal relationships and enable probabilistic inference among a set of variables. Fuzzy logic allows using the expert’s opinions when quantitative data are lacking and only qualitative or vague statements can be made. This approach provides an actionable model that accurately supports human cognition using linguistic variables. A case study of the patient’s safety risk is used to illustrate the application of the proposed method.
International Journal of Engineering
Materials and Energy Research Center
1025-2495
30
v.
1
no.
2017
66
74
https://www.ije.ir/article_72862_6a817617641bf641445f9a517ada284e.pdf
Design of a Reliable Facility Location Model for Health Service Networks
Mohammad Saber
Fallah Nezhad
Industerial Engineering, Yazd Univarsity
author
naeme
zarrinpoor
Indusrial Engineering, Shiraz University of Technology
author
Mir Saman
Pishvaee
Industrial Engineering, Iran University of Science and Technology
author
text
article
2017
eng
This paper proposes a novel facility location model for health service network design by considering different key elements including the reliability aspects, service capacity, congestion, service quality, surrounding public infrastructures, geographical accessibility and several types of cost such as investment, transportation and operational costs. We formulate the problem as a robust scenario-based stochastic programming model to deal with different categories of uncertainty associated with reliability, demand, service and geographical accessibility such that the minimization of expected costs under all disruption scenarios will be attained. To illustrate the applicability of the proposed model, a real-life case study based on the health service network of Sistan and Baluchestan province is presented. The findings of this research enable the system designers to investigate different strategic and operational decisions in the design and management of the health service networks from both cost and risk perspectives.
International Journal of Engineering
Materials and Energy Research Center
1025-2495
30
v.
1
no.
2017
75
84
https://www.ije.ir/article_72863_27d66193a6a5a651e0a404ec9e8e216f.pdf
Maintenance and Work-rest Scheduling in Human-machine System According to Fatigue and Reliability
rasoul
jamshidi
industrial engineering, amirkabir university of technology
author
text
article
2017
eng
Most manufacturers use human-machine systems to produce high-quality products. Dealing with human-machine systems is very complicated since not only machines should be utilized in proper condition but also appropriate environment should be provided for human resources. Most manufacturers have a maintenance plan for machines but many of them do not have a proper work-rest schedule for human resources. Considering this fact we emphasis on human role in human-machine systems maintenance and propose a mathematical model that obtains the optimal work-rest schedule for humans based on fatigue-recovery models and the optimal maintenance policy for machines based on reliability level. The performance of proposed model was examined by some instances and the obtained results indicate this model can provide effective maintenance policy for human-machine systems.
International Journal of Engineering
Materials and Energy Research Center
1025-2495
30
v.
1
no.
2017
85
92
https://www.ije.ir/article_72864_8c851c39b48d50c94b39b60153f77d57.pdf
Modeling of Stiffening and Strengthening in Nano-Layered Silicate/Epoxy (RESEARCH NOTE)
Reza
Bagheri
MSE, Sharif University of Technology
author
Raymod
Peason
MSE, Lehigh University
author
Bahereh
Marouf
Materials Science and Engineering, Urmia University
author
text
article
2017
eng
The aim of this paper is to investigate adhesion property between nano-layered filler and the polymer matrix using a combination of experimental and micromechanical models as well as the changes in yield strength and stiffness of a layered silicate-filled epoxy nanocomposite. The results indicate that addition of intercalated layered silicate particles increased Young’s modulus and yield strength of the epoxy resin, although the increases in stiffness and yield strength are modest, 30% and 4%, respectively. In addition, experimental results were compared with predictive stiffening and strengthening models. The rule of mixtures provides an upper bound for the modulus in these materials, while the Halpin-Tsai model provides a lower bound at low filler contents. The strengthening model used suggests the possibility of presence of a relatively modest adhesion between the intercalated layered silicate and epoxy resin rather than weak adhesion in the intercalated systems.
International Journal of Engineering
Materials and Energy Research Center
1025-2495
30
v.
1
no.
2017
93
100
https://www.ije.ir/article_72865_a9b2ee78e22763763c5008d7cb9b396f.pdf
Hot Corrosion Behavior of Functional Graded Material Thermal Barrier Coating (RESEARCH NOTE)
Mohsen
Rahnavard
Mechanical and Industrial Engineering, Islamic Azad University Semnan Branch
author
text
article
2017
eng
In this paper a functional graded material (FGM) thermal barrier coating (TBC) is prepared using Atmospheric Plasma Spraying (APS) method. The FGM layers were deposited by varying the feeding ratio of CYSZ/NiCrAlY and conventional CYSZ on a NiCrALY-coated Inconel 738 substrates. Hot corrosion behavior, bonding strength and the related failure mechanisms of a conventional TBC and a FGM TBC are investigated. Hot corrosion studies were conducted in presence of 45% Na2SO4+ 55% V2O5 molten salt at 1000 oC temperature. The as-sprayed coatings and heat-treated coatings were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Exposing to hot corrosion test, the FGM TBC showed better chemical stability and higher life service in comparison to the conventional TBC. As a result, functional graded material thermal barrier coating exhibited very promising potential as a novel TBC material.
International Journal of Engineering
Materials and Energy Research Center
1025-2495
30
v.
1
no.
2017
101
108
https://www.ije.ir/article_72866_34cd0f558853b516ce3c3f882dc35b9d.pdf
Sliding Friction Contact Stiffness Model of Involute Arc Cylindrical Gear Based on Fractal Theory
Zhijun
Sun
School of Manufacturing Science and Engineering, Sichuan University
author
Jian
Chen
School of Manufacturing Science and Engineering, Sichuan University
author
Li
Hou
School of Manufacturing Science and Engineering, Sichuan University
author
Ma
Dengqiu
School of Engineering and Technology, Zunyi Normal College
author
Haiyan
Zhang
School of Manufacturing Science and Engineering, Sichuan University
author
text
article
2017
eng
Gear’s normal contact stiffness played an important role in the mechanical equipment. In this paper, the M-B fractal model is modified and the contact surface coefficient is put forward to set up the fractal model, considering the influence of friction, which could be used to calculate accurately the involute arc cylindrical gears’ normal contact stiffness based on the fractal theory and Hertz theory. The contact surface coefficient is an exponential function of the load, radius of curvature and tooth line radius. The simulation results validate the reasonability of the contact surface coefficient and correctness of the fractal model. The contact surfaced coefficient increases with the increase of the load, radius of curvature and tooth line radius; the normal contact stiffness increases with the increase of material properties parameters, radius of the gear, load and fractal dimension (when fractal dimension is greater than 1.85, the normal contact stiffness decreases). Meanwhile, the normal contact stiffness increases with the decrease of roughness and decreases exponentially or linearly with the increase of friction coefficient. Research results are the foundation of the further analysis of arc gear contact problems.
International Journal of Engineering
Materials and Energy Research Center
1025-2495
30
v.
1
no.
2017
109
119
https://www.ije.ir/article_72867_83351d64e56b7f1f1a41fdf35b119dd6.pdf
Active Noise Cancellation using Online Wavelet Based Control System: Numerical and Experimental Study
J.
Roshanian
aerospace engineering, K. N. Toosi university of technology
author
H
Khaksari
aerospace engineering, K. N. Toosi university of technology
author
A M
khoshnood
aerospace engineering, K. N. Toosi university of technology
author
S. M.
Hasani
aerospace engineering, K. N. Toosi university of technology
author
text
article
2017
eng
Reaction wheels (RWs) used for attitude control of space vehicle systems usually encounter with undesired wide band noises. These noises which significantly affect the performance of regulator controller must tune the review or review rate of RWs. According to wide frequency band of noises in RWs the common approaches of noise cancellation cannot conveniently reduce the effects of the noise. Therefore, the advanced analyzer of frequency domain signal processing such as wavelets must be used to realize the noise cancellation. In this regards, only the online application of wavelets can be practical. In this paper, an online active noise canceller based on online wavelet theory is employed to omit the effects of undesired noise. In this way, dynamic identification of a RW as well as wavelet delay compensation are used simultaneously to design an active noise cancellation system. Numerical and experimental investigations of KNTU test setup as a hard ware in the loop system show the preferences of the proposed method of online noise cancellation.
International Journal of Engineering
Materials and Energy Research Center
1025-2495
30
v.
1
no.
2017
120
126
https://www.ije.ir/article_72868_ad7d2d0bc81ae386530e0c19fc928373.pdf
Design and Implementation of Field Programmable Gate Array Based Baseband Processor for Passive Radio Frequency Identification Tag (TECHNICAL NOTE)
Angel
C
E&C, Govt.Engineering College Kushalnagar
author
Narayan G
Kurahatti
E&C, East Point College of engineering and Technolohy
author
Neelappa
Dyamannavr
E&C, Govt.Engineering College Kushalnagar
author
text
article
2017
eng
In this paper, an Ultra High Frequency (UHF) base band processor for a passive tag is presented. It proposes a Radio Frequency Identification (RFID) tag digital base band architecture which is compatible with the EPC C C2/ISO18000-6B protocol. Several design approaches such as clock gating technique, clock strobe design and clock management are used. In order to reduce the area Decimal Matrix Code (DMC) technique is used. The digital base band processor has been simulated and implemented using Xilinx platform. The complete design is verified and tested on Spartan-6 Field Programmable Gate Array (FPGA) board. The performance of system is measured in terms of power. The synthesis result shows that, the power required for complete design of digital baseband processor is 5mW on a supply voltage of 1.2 V.
International Journal of Engineering
Materials and Energy Research Center
1025-2495
30
v.
1
no.
2017
127
133
https://www.ije.ir/article_72869_51268d7ca94de7f7744e5bec552d586e.pdf
Fingertip Radius Effect of an on-Surface-Manipulated Object
Shahram
Hadian Jazi
Department of Mechanical Engineering, University of Isfahan
author
Pouyan
Rasouli
Department of Mechanical Engineering, Isfahan University of Technology
author
mehdi
Keshmiri
Department of Mechanical Engineering, Isfahan University of Technology
author
text
article
2017
eng
Cooperative arms are two or more arms in series which assume the structure of a parallel robot on account of gripping an intermediary object, and are commonly used in accurate assembly industries, coaxialization, movement of object, etc. Gripping an intermediary object is one of the complicated subjects in analysis of cooperative arms, whose analysis is mostly dependent upon the manner the object is gripped by the arms fingertips. In the case of griping objects in frictional manner, the elimination of unwanted slippage of fingertips on the object due to the environmental factors, and also the effect of the fingertips geometry on the movement equations are among the major topics in such arms analysis. The dynamic analysis and control synthesis of the undesired slippage between an object and robot fingertips in object manipulation and the effects of finger radius or geometry of the fingertip on the function dynamics and slippage control is studied in this article. The slip/roll contact model is applied in the dynamic formulation and analysis of the finger geometry the effects of which are studied using numerical simulation.
International Journal of Engineering
Materials and Energy Research Center
1025-2495
30
v.
1
no.
2017
134
142
https://www.ije.ir/article_72870_abb50e09c3ad102ceb0697ad177f43f3.pdf
Welding Properties of Polymeric Nanocomposite Parts Containing Alumina Nanoparticles in Friction Stir Welding Proces
Mahsa
Daryadel
Mechanical engineering, Urmia university
author
Rezgar
Hasanzadeh
Mechanical Engineering, Urmia University
author
Ali
Doniavi
Mechanical Engineering, Urmia University
author
Saeedeh
Babazadeh
Mechanical engineering, Urmia university
author
Sajjad
Mamaghani shishavan
Mechanical Engineering, Urmia University
author
text
article
2017
eng
Although in recent years, welding of polymers has been developed but welding of polycarbonates is still faced with serious challenges such as improving the quality of welded section. In the present study, mechanical properties of polycarbonate friction stir welded samples with different nano alumina content were investigated. For this purpose, firstly polycarbonate (as matrix) was melt compounded with nano alumina in variant weight percentages including 0, 1, 2 and 3% using a twin-screw extruder. Then, nanocomposite samples were produced using an injection molding machine and were friction stir welded with a special tool on a milling machine. The effects of weight percentage of nano alumina, travel and rotational speeds (all in four levels) were investigated on the tensile strength and hardness of the welded nanocomposite samples according to a L16 orthogonal array of Taguchi method. According to the obtained results, the weight percentage of nano alumina is the most effective parameter on the tensile strength and hardness of welded nanocomposite specimens. By increasing the percentage of nano alumina to 1%, tensile strength increased. However, by increasing the nano alumina more than 1%, this strength reduced due to agglomeration of nanoalumina in high weight percentages. Results also demonstrated that processing parameters do not affect the mechanical properties of welded nanocomposite samples significantly.
International Journal of Engineering
Materials and Energy Research Center
1025-2495
30
v.
1
no.
2017
143
151
https://www.ije.ir/article_72871_b6764fa26d5cd3a3fe2549d5dabaa374.pdf