Islamic Azad University, Khomeinishahr Branch
Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering
2008-4927
10
4
2017
11
01
Micromachining the Aluminium Tubes Using Abrasive Finishing in Alternating Magnetic Field
5
14
EN
Reza
Abedinzadeh
Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Isfahan, Iran
abedinzadeh@iaukhsh.ac.ir
Rasoul
Gorji
Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Isfahan, Iran
rasoulgorji@gmail.com
This study introduced a method based on magnetic field assisted finishing mechanism for micromachining the inner surfaces of Aluminum tubes. In this approach, using the alternating magnetic field of an AC electromotor, abrasive particles were formed as Magnetic Rods (Magnetic Clusters) and surface micromachining was carried out by the dynamic particular pattern made by an alternating magnetic field. The aim of this process was to improve machining efficiency of Aluminum tubes based on surface roughness and dimensional tolerance. Continuously, the effects of parameters such as tube inner diameter, abrasive particles weight, current frequency and machining time on changes of surface roughness were assessed by DOE technique. Taguchi standard orthogonal method (L<sub>9</sub> (3<sup>4</sup>)) was used to analyze the process factors. Moreover, the output results derived from experiments were analyzed by two most widely used analytical techniques including Signal to Noise ratio (S/N) and Analysis of Variance (ANOVA). Finally, by considering the results of analysis and plotted graphs, abrasive particles weight and current frequency were identified as significant factors and the optimum conditions of process including tube inner diameter of 55 mm, abrasive particles weight of 1 g, frequency of 40 Hz and machining time of 60 s were obtained.
Abrasive finishing,Alternating magnetic,Taguchi,ANOVA,Roughness
http://jsme.iaukhsh.ac.ir/article_539335.html
http://jsme.iaukhsh.ac.ir/article_539335_5786de342761b2f6a7afa5cd6fdac989.pdf
Islamic Azad University, Khomeinishahr Branch
Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering
2008-4927
10
4
2017
11
01
Experimental Investigation and Numerical Prediction of Fatigue Life in Force Fitted Fastener Holes
15
32
EN
Hadi
Taghizadeh
Department of Mechanical Engineering, University of Tabriz, Tabriz, Iran
h.taghizadeh@tabrizu.ac.ir
Tagbakhsh
Chakherlou
Department of Mechanical Engineering, University of Tabriz, Tabriz, Iran
tnavid@tabrizu.ac.ir
In this paper, the effect of interference fit on fatigue life of holed plate of mechanical joints was investigated experimentally. Fatigue tests were carried out on the holed specimens of Al-alloy 7075-T6 alloy. The interference fit process consists of force fitting a fastener into the hole with a negative clearance (diameter of the fastener is larger than of the hole) that produces beneficial tangential pre-stress at the edge of the hole. Stress and strain analysis was implemented in order to estimate the fatigue life due to interference fit process. 3D finite element simulations have been performed to obtain stress and strain histories and distributions around the hole due to interference fit and subsequent cyclic longitudinal loading using ANSYS package. The results obtained from the finite element analysis of the interference fit were employed to predict the fatigue life. The fatigue life was divided into two phases of crack initiation life and fatigue crack growth life. Fatigue initiation life was estimated using Fatemi–Socie multiaxial fatigue criterion, and the fatigue crack growth life was predicted using AFGROW computer code. The results show that there is a good agreement between the numerically predicted total fatigue life and experimental fatigue test results
Interference Fit,Fatigue Life,Finite Element,Crack Initiation Life,Crack Growth Life
http://jsme.iaukhsh.ac.ir/article_539336.html
http://jsme.iaukhsh.ac.ir/article_539336_8c08fa7794bcbd4db66ab0bc136f0170.pdf
Islamic Azad University, Khomeinishahr Branch
Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering
2008-4927
10
4
2018
07
11
Free Vibration Analysis of Sandwich Micro Beam with Piezoelectric Based on Modified Couple Stress Theory and Surface Effects
33
48
EN
Mohammad
khajekhabaz
Khomeinishahr branch, Islamic Azad Uni., Esfahan, Iran.
a.eftekhari@iaukhsh.ac.ir
Ali
Eftekhari
Khomeinishahr branch, Islamic Azad Uni., Esfahan, Iran.
s_ali_ef@yahoo.com
Mohammad
Hashemian
Islamic Azad University, Khomeinishahr Branch
mohamad.hashemian@gmail.com
In this paper, the free vibration analysis of sandwich micro beam with piezoelectric layers based on the modified couple stress and surface elasticity theories are investigated. The Hamilton’s principle is employed to derive the sandwich micro beam with piezoelectric based on modified couple stress theory incorporating with Gurtin- Murdoch surface theory. The generalized differential quadrature method is used to discretize the partial differential equation into the ordinary differential equation. The effect of various parameters such as thickness to material length scale parameter ratio, the surface residual stress, Young's modulus of surface layer, surface mass density and surface piezoelectric constant are investigated by comparing the results obtained using the modified couple and classical theories. Numerical results of this problem evaluate the effect of micro length scale parameters on natural frequency. The results show that surface parameter effects are significant when the model is small, but can be neglected with increasing model size.
Micro-beam,Modified couple stress elasticity theory,Gurtin- Murdoch surface theory,Free vibration analysis
http://jsme.iaukhsh.ac.ir/article_541297.html
http://jsme.iaukhsh.ac.ir/article_541297_f25d23004a7473fe48d98e1c2c0571f0.pdf
Islamic Azad University, Khomeinishahr Branch
Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering
2008-4927
10
4
2018
07
11
Thermo-elastic Analysis of Functionally Graded Thick- Walled Cylinder with Novel Temperature – Dependent Material Properties using Perturbation Technique
49
64
EN
Alireza
Nadafoskoue
Assistant Professor, Faculty Member of Imam Hossein University (AS)
anadaf@ihu.ac.ir
hadi
mohammadi hooyeh
Department of Solid Mechanics, Faculty of Engineering, Imam Hossein University, Tehran, Iran
mohammadihadi34@yahoo.com
In this work, thermo – elastic analysis for functionally graded thick – walled cylinder with temperature - dependent material properties at steady condition is carried out. The length of cylinder is infinite and loading is consist of internal hydrostatic pressure and temperature gradient. All of physical and mechanical properties expect the Poisson's ratio are considered as multiplied an exponential function of temperature and power function of radius. With these assumptions, the nonlinear differential equations for temperature distribution at cylindrical coordinate is obtained. Temperature distribution is achieved by solving this equation using classical perturbation method. With considering strain – displacement, stress – strain and equilibrium relations and temperature distribution that producted pervious, the constitutive differential equation for cylinder is obtained. By employing mechanical boundary condition the radial displacement is yield. With having radial displacement, stresses distribution along the thickness are achieved. The results of this work show that by increasing the order of temperature perturbation series the convergence at curves is occurred and also dimensionless radial stress decrease and other stresses with dimensionless radial displacement increase.
: Infinite thick – walled cylinder,nonlinear heat transfer,classical perturbation method,Temperature-dependent properties,Functionally graded material
http://jsme.iaukhsh.ac.ir/article_541298.html
http://jsme.iaukhsh.ac.ir/article_541298_3384192702f2deb68d07cc19e6dad087.pdf