Sharif University of Technology
Scientia Iranica
10263098
23453605
25
2
2018
04
01
Bending and vibration analysis of delaminated Bernoulli–Euler microbeams using the modified couple stress theory
675
688
EN
R.  A.
Jafari  Talookolaei
Department of Mechanical Engineering, Babol Noshirvani University of Technology, Babol 4714871167, Iran
N.
Ebrahimzade
Department of Mechanical Engineering, Babol Noshirvani University of
Technology,
Babol
47148

71167,
Iran
S.
Rashidi  Juybari
Department of Mechanical Engineering, Babol Noshirvani University of
Technology, Babol 47148

71167, Iran
K.
Teimoori
Department of Mechanical Engineering, The City College of the City University of New York, NY
10031, USA
10.24200/sci.2017.4252
In this paper, we study static bending and free vibration behavior of Bernoulli–Euler microbeams with a single delamination using the modified couple stress theory. The delaminated beam is modeled by four interconnected subbeams using the delamination zone as their boundaries. The free and constrained mode theories have been utilized to model the interaction of delamination surfaces in the damaged area. The continuity as well as compatibility conditions are satisfied between the neighboring subbeams. After verification of the results for some case studies with available solutions, the effect of various parameters such as spanwise and thicknesswise locations of the delamination, material length scale parameter, and boundary conditions on the static bending and free vibration characteristics of the sizedependent microbeam have been investigated in detail.
Delaminated microbeam,free vibration,modified couple stress theory,Free and constrained models
http://scientiairanica.sharif.edu/article_4252.html
http://scientiairanica.sharif.edu/article_4252_8dfb6c21c9b15a1e5ed5dfcdeddae36f.pdf
Sharif University of Technology
Scientia Iranica
10263098
23453605
25
2
2018
04
01
Numerical simulation of porous radiant burners under transient condition
689
699
EN
Hoda
Shabani Nejad
Department of Mechanical Engineering, Shahid
Bahonar University of Kerman, Kerman, Iran
hshabani.nejad@gmail.com
Seyed Abdolreza
Gandjalikhan Nassab
Department of Energy, Institute of Science, High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran
E brahim
Jahanshahi Javaran
Department of Energy, Institute of Science, High Technology and Environmental Sciences, Graduate University of
Advanced Technology, Kerman, Iran.
10.24200/sci.2017.4251
The purpose of this work is to analyze two dimensional rectangular porous radiant burners for investigating the thermal characteristics of this type of burners in starting time period. Since, the solid and gas phases are not in thermal equilibrium, two separate energy equations for these two phases are solved numerically with alternative direction implicit scheme. The gas is considered nonradiative medium and for computation of radiative heat flux through the solid phase, the radiative transfer equation (RTE) is employed and solved with the discrete ordinates method (DOM). It is obtained that due to the dominant radiation effects, the required time to reach the steady gas temperature is very low. Furthermore, the effects of optical thickness and scattering albedo on the performance of porous radiant burner (PRB) are investigated.
Porous radiant burner,transient condition,discrete ordinate method
http://scientiairanica.sharif.edu/article_4251.html
http://scientiairanica.sharif.edu/article_4251_818ce819938113b966e22c237d878f4b.pdf
Sharif University of Technology
Scientia Iranica
10263098
23453605
25
2
2018
04
01
Application of Hyperelastic Models in Mechanical Properties prediction of Mouse Oocyte and Embryo Cells at Large Deformations
700
710
EN
Ali
A. Abbasi
School of Mechanical Engineering, Sharif University of Technology, Tehran, 111559161, Iran
M.T.
Ahmadian
Center of Excellence in Design, Robotics and Automation (CEDRA), School Of Mechanical Engineering, Sharif University of Technology, Tehran, 111559161, Iran
ahmadian@sharif.ir
Ali
Alizadeh
Institute for Biotechnology & Environment (IBE), Sharif University of Technology, Tehran, 111559161, Iran
aalizadeh@sharif.edu
S.
Tarighi
School of Management and Economics, Sharif University of Technology, Tehran, 111559161, Iran
s_tarighi@pgre.iust.ac.ir
10.24200/sci.2017.4321
<em>Biological cell studies have many applications in biology, cell manipulation and diagnosis of diseases such as cancer and malaria. In this study, inverse finite element method (IFEM) combined with LevenbergMarquardt optimization algorithm has been used to extract and characterize material properties of mouse oocyte and embryo cells at large deformations. Then, the simulation results have been validated using data from experimental works. In this study, it is assumed cell material is hyperelastic, isotropic, homogenous and axisymmetric. For inverse analysis, FEM model of cell injection experiment which implemented in Abaqus software has been coupled with LevenbergMarquardt optimization algorithm written in Matlab; based on this coupling the optimum hyperelastic coefficients which give the best match between experimental and simulated forces are extracted. Results show that among different hyperelastic material models, Ogden material is well suitable for characterization of mouse oocyte cell and MooneyRivlin or polynomial are suitable for characterization of mouse embryo cell. Moreover the evaluated Poisson ratio of the cell is obtained to be equal to 0.5, which indicates the structural material of mouse oocyte and embryo, are compressible. </em>
Biological cell,Inverse Finite Element Method,Hyperelastic material,LevenbergMarquardt optimization algorithm,Large Deformation
http://scientiairanica.sharif.edu/article_4321.html
http://scientiairanica.sharif.edu/article_4321_d79547fa63f4b0a1ee3bdad7a7342f21.pdf
Sharif University of Technology
Scientia Iranica
10263098
23453605
25
2
2018
04
01
Vibration boundary control of Timoshenko microcantilever using piezoelectric actuators
711
720
EN
Amin
Mehrvarz
Department of Mechanical Engineering, Sharif University of Technology, Azadi Ave, Tehran, Iran
Hassan
Salarieh
Department of Mechanical Engineering, Sharif University of Technology, Azadi Ave, Tehran, Iran
salarieh@sharif.edu
Aria
Alasty
Department of Mechanical Engineering, Sharif University of Technology, Azadi Ave, Tehran, Iran
aalasty@sharif.edu
Ramin
Vatankhah
School of Mechanical Engineering, Shiraz University, Shiraz, Iran
rvatankhah@mech.sharif.edu
10.24200/sci.2017.4327
One of the methods of force/moment exertion to micro beams is utilizing piezoelectric actuators. In this paper the problem of vibration boundary control of a clampedfree Timoshenko microcantilever considering effects of the piezoelectric actuator to achieve asymptotic stability is addressed. To achieve this purpose, the dynamic equations of the beam actuated by a piezoelectric layer laminated on one side of the beam are extracted. The control law has been made to decay vibrations of the beam. This control law is achieved from the feedback of time derivatives of boundary states of the beam. The obtained control is applied in the form of voltage of the piezoelectric. To illustrate the impact of the proposed controller to the micro beam, the finite element method and Timoshenko beam element have been used and then the simulation has been performed. The simulation shows that not only does this control voltage decay the vibration of the beam, but also the mathematical proofs proposed in this article are precise and implementable.
Timoshenko micro beam,piezoelectric actuator,PDE model,boundary control
http://scientiairanica.sharif.edu/article_4327.html
http://scientiairanica.sharif.edu/article_4327_423a7a3059b34605fa9cd1f0cb18b78e.pdf
Sharif University of Technology
Scientia Iranica
10263098
23453605
25
2
2018
04
01
Performance study of an innovative heating technique for a modified solar still
721
727
EN
A.E.
Kabeel
Mechanical Power Engineering Dept., Faculty of Engineering, Tanta University, Egypt
M.M.
Bassuoni
Mechanical Power Engineering Dept., Faculty of Engineering, Tanta University, Egypt
M.A.
Rozza
Mechanical Power Engineering Dept., Faculty of Engineering, Tanta University, Egypt
10.24200/sci.2017.4329
An experimental comparison of water productivity between a conventional single slope, solar still and a modified one is introduced in this work. The modified solar still is incorporated with a new heating technique on the saline water surface using finned cover with holes. These fins are used to increase the heat transfer area between the cover and saline water meanwhile, holes are used to allow evaporated water to go through. These experiments are held under the outdoor conditions of Tanta, Egypt. The performance of the two solar stills has been tested at a water depth of 0.05 m and a quantity of saline water of 50 L. The results indicated that the productivity of water per square meter per day for the modified design still is higher than the conventional still by about 30.6%.
solar still,desalination,solar energy
http://scientiairanica.sharif.edu/article_4329.html
http://scientiairanica.sharif.edu/article_4329_9cc6ad75cb5ccfd7bd10f196af5211cb.pdf
Sharif University of Technology
Scientia Iranica
10263098
23453605
25
2
2018
04
01
Free Vibration Analysis of Rotating Functionally Graded Annular Disc of Variable Thickness Using Generalized Differential Quadrature Method
728
740
EN
Mohammad hadi
Jalali
Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran
Behrooz
Shahriari
Department of Mechanical and Aerospace Engineering,, Malek Ashtar University of Technology, Isfahan, Iran
Omid
Zargar
School of Mechanical Engineering, College of Engineering, University of Tehran
Mostafa
Baghani
School of Mechanical Engineering, College of Engineering, University of Tehran
Majid
Baniassadi
School of Mechanical Engineering, College of Engineering, University of Tehran
10.24200/sci.2017.4325
In this paper, free vibration analysis of rotating annular disc made of functionally graded material (FGM) with variable thickness is presented. Elasticity modulus, density and thickness of the disc are assumed to vary radially according to a power low function. The natural frequencies and critical speeds of the rotating FG annular disc of variable thickness with two types of boundary conditions are obtained employing the numerical generalized differential quadrature method (GDQM). The boundary conditions considered in the analysis is the both edges clamped (CC) and the inner edge clamped and the outer edge free (CF).The influence of the graded index, thickness variation, geometric parameters and angular velocity on the dimensionless natural frequencies and critical speeds are demonstrated. It is shown that using a plate with a convergent thickness profile, we have a higher critical speed and natural frequency and using a divergent thickness profile, we can lower the critical speed. It is found that increase in the ratio of innerouter radii could increase the critical speed of the FG annular disk. The results of the present work could improve the design of the rotating FG annular disk in order to avoid resonance condition
Annular Plate,Functionally graded material,Generalized Differential Quadrature Method,natural frequency
http://scientiairanica.sharif.edu/article_4325.html
http://scientiairanica.sharif.edu/article_4325_d313774daf8501654bc29e2d6b681c1b.pdf
Sharif University of Technology
Scientia Iranica
10263098
23453605
25
2
2018
04
01
Impact of compliant walls on magnetohydrodynamics peristalsis of Jeffrey material in a curved configuration
741
750
EN
T.
Hayat
Department of Mathematics, QuaidiAzam University 45320, Islamabad 44000, Pakistan
S.
Farooq
Department of Mathematics, QuaidiAzam University 45320, Islamabad 44000, Pakistan
B.
Ahmad
Department of Mathematics, Faculty of Science, King Abdulaziz University,
Jeddah 21589, Saudi Arabia
10.24200/sci.2017.4322
Primary aim of current attempt is to analyze the peristaltic flow of nonNewtonian material in a curved channel subject to two salient features namely the Soret and Dufour and radial magnetic field. Channel walls are of compliant characteristics. Problem formulations for constitutive equations of Jeffrey fluid are made. Lubrication approach is implemented for the simplification of mathematical analysis. Dimensionless problems of stream function, temperature and concentration are computed numerically. Characteristics of distinct variables on the velocity, temperature, coefficient of heat transfer and concentration are examined. Besides this graphical results indicates that velocity profile enhances significantly for compliant wall parameters however due to the resistance characteristics of Lorentz force velocity profile decays. Furthermore it is noted that temperature profile enhances for larger Dufour number however reverse behavior is noticed in the concentration profile when Soret and Schmidt numbers are increased.
Jeffrey fluid,Radial magnetic field,Compliant wall conditions,Soret and Dufour effects,Curved channel
http://scientiairanica.sharif.edu/article_4322.html
http://scientiairanica.sharif.edu/article_4322_020d58859294f42a5a32a0182412a9c8.pdf
Sharif University of Technology
Scientia Iranica
10263098
23453605
25
2
2018
04
01
Numerical Investigation of Back Pressure and Freestream Effects on a Mixed Compression Inlet Performance
751
761
EN
Abbas
Ebrahimi
Department of Aerospace Engineering, Sharif University of Technology, Tehran, Iran
ebrahimi_a@sharif.ir
Majid
Zare Chavoshi
Department of Aerospace Engineering, Sharif University of Technology, Tehran, Iran
10.24200/sci.2017.4324
Inlet Performance has an important role in the operation of airbreathing propulsion systems. In this study, performance of a supersonic axisymmetric mixedcompression inlet in the supercritical operating condition is numerically studied. The effects of freestream Mach number and engineface pressure on performance parameters, including mass flow ratio, drag coefficient, total pressure recovery, and flow distortion are investigated. To this sake, a multiblock densitybased finite volume CFD code is developed and Reynoldsaveraged NavierStokes equations with SpalartAllmaras oneequation turbulence model is employed. The code is validated by comparing numerical results against other computational results and experimental data for two test cases of inviscid flow in a twodimensional mixedcompression inlet and flow in an external compression inlet. Finally, the code is utilized for investigation of a specific supersonic mixedcompression inlet with the design Mach number of 2.0 and length to diameter ratio of 3.4. Results revealed that the increment of freestream Mach number leads to decrease in total pressure recovery and drag coefficient, while mass flow ratio and flow distortion increase. The effects of engineface pressure on performance parameters showed that by increasing the engineface pressure, mass flow ratio and drag coefficient remain constant while total pressure recovery increases and flow distortion decreases.
Mixed Compression Inlet,Performance Parameters,Multiblock Grid,SpalartAllmaras Turbulence Model,Roe’s approximated Riemann solver
http://scientiairanica.sharif.edu/article_4324.html
http://scientiairanica.sharif.edu/article_4324_1983d81437c83828a366d050b60df003.pdf
Sharif University of Technology
Scientia Iranica
10263098
23453605
25
2
2018
04
01
Effects of insitu formed TiB whiskers on microstructure and mechanical properties of spark plasma sintered Ti–B4C and Ti–TiB2 composites
762
771
EN
Abbas
Sabahi Namini
Department of Materials Engineering, Sahand University of Technology, Tabriz, Iran
Maziyar
Azadbeh
Department of Materials Engineering, Sahand University of Technology, Tabriz, Iran
Mehdi
Shahedi Asl
Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran
10.24200/sci.2017.4499
Monolithic titanium, Ti–1 wt% B<sub>4</sub>C, Ti–2.5 wt% TiB<sub>2</sub> were spark plasma sintered at 1050 ºC for 5 min under 50 MPa. The effect of B<sub>4</sub>C and TiB<sub>2</sub> additions on densification process, microstructural development and mechanical properties of titanium was investigated. The results revealed that relative density of undoped, B<sub>4</sub>C and TiB<sub>2</sub>doped Ti samples reached ~9899%. Xray diffraction patterns, thermodynamic assessments, and microstructural investigations verified the insitu formation of TiB whiskers in both composite samples as well as appearance of TiC spheres in Ti–B<sub>4</sub>C composite. However, trace unreacted TiB<sub>2</sub> and B<sub>4</sub>C additives were remained in the composites as a result of incomplete chemical reactions due to shorttime SPS process. Compared to undoped Ti sample, grain growth was hindered when the sample was doped by B<sub>4</sub>C or TiB<sub>2</sub>. Elongation, ultimate tensile strength and Vickers hardness of B<sub>4</sub>C or TiB<sub>2</sub>doped samples were higher than those of monolithic titanium but bending strength of ceramicdoped samples significantly lower, compared to undoped titanium. These outcomes were discussed in detail and related to presence/formation of several ceramic phases with different morphologies in Ti matrix.
Spark plasma sintering,titanium,Ceramic additives,TiB whisker,microstructure,mechanical properties
http://scientiairanica.sharif.edu/article_4499.html
http://scientiairanica.sharif.edu/article_4499_5b904bef8b63842096469abfd8299389.pdf
Sharif University of Technology
Scientia Iranica
10263098
23453605
25
2
2018
04
01
A Design Approach for Coaxial Magnetic Gear and Determination of Torque Capability
772
789
EN
Mohammad Amin
Rahimi
Department of Mechanical Engineering, Sharif University of Technology, Tehran, Iran
Mohammad
Durali
Department of Mechanical Engineering, Sharif University of Technology, Tehran, Iran
durali@sharif.ir
Mohsen
Asghari
Department of Mechanical Engineering, Sharif University of Technology, Tehran, Iran
10.24200/sci.2017.4326
This paper presents a time saving methodology for design and sizing the magnetic gear sets. Some new design parameters similar to mechanical gears are defined to calculate the torque capacity based on these. Finite element analysis is extensively used to calculate the variation of gear set torque capacity due to changes in different geometric parameters of a set. Different design curves are obtained by which the design and sizing of the gears can routinely be accomplished. Optimal performance of magnetic gear wasn’t the main target of this research and just this method helps gear designers to decide on parameters such as scale of gears, magnet thickness, stack length and pole pair numbers and come up with a close to optimum geometry design
Magnetic gear,Mechanical gear,Design parameter,Torque capacity,Gear module
http://scientiairanica.sharif.edu/article_4326.html
http://scientiairanica.sharif.edu/article_4326_eb3343c6465695b855ee628db9f43427.pdf
Sharif University of Technology
Scientia Iranica
10263098
23453605
25
2
2018
04
01
Stability of Thixotropic Fluids in Pipe Flow
790
798
EN
M.H.
Nahavandian
Center of Excellence in Design and Optimization of Energy Systems (CEDOES),
School of Mechanical Engineering, College of Engineering, University of Tehran,
Tehran, Iran
M.
Pourjafar
Center of Excellence in Design and Optimization of Energy Systems (CEDOES),
School of Mechanical Engineering, College of Engineering, University of Tehran,
Tehran, Iran
K.
Sadeghy
Center of Excellence in Design and Optimization of Energy Systems (CEDOES),
School of Mechanical Engineering, College of Engineering, University of Tehran,
Tehran, Iran
10.24200/sci.2017.4498
Linear stability of a thixotropic fluid obeying the Moore model is investigated in pipe flow using a temporal stability analysis in which infinitesimallysmall perturbations, represented by normal modes, are superimposed on the base flow and their evolution in time is monitored in order to detect the onset of instability. An eigenvalue problem is obtained which is solved numerically using the pseudospectral Chebyshevbased collocation method. The neutral instability curve is plotted as a function of the thixotropy number of the Moore model. Based on the results obtained in this work, it is concluded that the thixotropic behavior of the Moore fluid has a destabilizing effect on pipe flow
Linear stability,thixotropic fluid,Moore model,spectral method,pipe flow
http://scientiairanica.sharif.edu/article_4498.html
http://scientiairanica.sharif.edu/article_4498_0959d26e217a0b0a2e7c1385117857c0.pdf
Sharif University of Technology
Scientia Iranica
10263098
23453605
25
2
2018
04
01
An explicit solution for the sizedependent large amplitude transverse vibration of thin functionally graded microplates
799
812
EN
A.R.
Setoodeh
Department of Mechanical and Aerospace Engineering, Shiraz University of Technology, Shiraz 71555, Iran
M.
Rezaei
Department of Mechanical and Aerospace Engineering, Shiraz University of Technology, Shiraz 71555, Iran
10.24200/sci.2017.4331
In this article, an analytical solution to the moderately large amplitude transverse vibration of thin functionally graded microplates (FGMPs) is presented based on a practical approach. The sizedependent nonlinear governing equation is obtained in conjunction with the Kirchhoff’s plate and modified couple stress theories. The material properties of functionally graded (FG) microplates are varied according to the Reddy’s model. The employed nonclassical theory contains one material length scale parameter to capture the size effects. The highly nonlinear governing equation is solved by means of homotopy analysis method to obtain accurate analytic approximations. The both of simply supported and clamped microplates with immovable edges are considered. Comparison of the present results with earlier studies wherever possible confirms the reliability and effectiveness of the present formulation for the design purpose. Furthermore, the effects of different parameters such as material gradient index, length scale parameter, and aspect ratio on the nonlinear frequency ratio are investigated.
Functionally graded microplates,Nonlinear vibration,Homotopy analysis method,modified couple stress theory,Size effects
http://scientiairanica.sharif.edu/article_4331.html
http://scientiairanica.sharif.edu/article_4331_4be8337673387b60940880c08300d50b.pdf
Sharif University of Technology
Scientia Iranica
10263098
23453605
25
2
2018
04
01
RPT Finite Element Formulation for Linear Dynamic Analysis of orthotropic Plates
813
823
EN
Jafar
Rouzegar
Department of Mechanical and Aerospace Engineering, Shiraz University of Technology, Shiraz, P.O. Box71555313, Iran.
rouzegar@sutech.ac.ir
Mohammad
Sayedain
Department of Mechanical and Aerospace Engineering, Shiraz University of Technology, Shiraz, P.O. Box71555313, Iran.
10.24200/sci.2017.4330
This paper presents finite element formulation for dynamic analysis of orthotropic plates using twovariable refined plate theory (RPT). Hamilton's principle is employed to obtain the governing equations and the semidiscrete approach is utilized for solving the equations. After constructing spatial weak form equations, a 4node rectangular plate element with six degrees of freedom (DOFs) per node is introduced for discretization of the domain. An unconditionally stable implicit Newmark scheme is used for temporal discretization. A MATLAB code with capability of modeling both static and dynamic plate problems with various boundary conditions is generated. Several numerical problems are solved and the obtained displacements and stresses are compared with the existing results in the literature. The results demonstrate the accuracy, simplicity and efficiency of present method in dynamic analysis of plate problems.
Orthotropic,Finite Element Method,Dynamic analysis,Twovariable refined plate theory,Rectangular plate element
http://scientiairanica.sharif.edu/article_4330.html
http://scientiairanica.sharif.edu/article_4330_c13bf68d05e7b4707652a6813470ddfb.pdf
Sharif University of Technology
Scientia Iranica
10263098
23453605
25
2
2018
04
01
Application of Ductile Fracture Criterion for Tensile Test of Zirconium Alloy 702
824
829
EN
DyiCheng
Chen
Department of Industrial Education and Technology, National Changhua University of Education, Changhua 500, Taiwan, R.O.C.
DongYao
Chang
Department of Industrial Education and Technology, National Changhua University of Education, Changhua 500, Taiwan, R.O.C.
FeiHsiang
Chen
Department of Mechatronic Engineering, National Taiwan Normal University, Taipei , Taiwan, R.O.C.
TsungYing
Kuo
Department of Industrial Education and Technology, National Changhua University of Education, Changhua 500, Taiwan, R.O.C.
10.24200/sci.2018.20174
In this study using ductile fracture criterion defined fracture energy, determining the critical damage value of normalized Cockcroft –Latham. True stressstrain value and materials properties were obtained from the tensile tests of zirconium alloy 702 and finite element analysis. It was observed that specimen fracture the maximum value occurred in the central area of the cross section, the highest critical damage value equal to 0.649. In this paper, through the inverse analysis method of the FEA to explore on rarely research data zirconium alloys. The results proposed to evaluate the forgeability, expect the present study could be used as a basis of designing and developing zirconium alloy.
Normalized Cockcroft –Latham,Ductile fracture criterion,Zirconium alloy 702,Tensile test
http://scientiairanica.sharif.edu/article_20174.html
http://scientiairanica.sharif.edu/article_20174_2e88d7e4cf5e19975ae185cea263299f.pdf