Islamic Azad University - Arak Branch
Journal of Solid Mechanics
2008-3505
2008-7683
10
2
2018
06
30
Wave Propagation Analysis of CNT Reinforced Composite Micro-Tube Conveying Viscose Fluid in Visco-Pasternak Foundation Under 2D Multi-Physical Fields
232
248
EN
A. H
Ghorbanpour Arani
Faculty of Mechanical Engineering, Amirkabir University of Technology, Hafez Avenue, Tehran, Iran
gh.amir36@yahoo.com
M.M
Aghdam
Faculty of Mechanical Engineering, Amirkabir University of Technology, Hafez Avenue, Tehran, Iran
M.J
Saeedian
Faculty of Mechanical Engineering, University of Kashan, Kashan, Iran
In this research, wave propagation analysis in polymeric smart nanocomposite micro-tubes reinforced by single-walled carbon nanotubes (SWCNT) conveying fluid is studied. The surrounded elastic medium is simulated by visco-Pasternak model while the composite micro-tube undergoes electro-magneto-mechanical fields. By means of micromechanics method, the constitutive structural coefficients of nanocomposite are obtained. The fluid flow is assumed to be incompressible, viscous and irrotational and the dynamic modelling of fluid flow and fluid viscosity are calculated using Navier-Stokes equation. Micro-tube is simulated by Euler-Bernoulli and Timoshenko beam models. Based on energy method and the Hamilton’s principle, the equation of motion are derived and modified couple stress theory is utilized to consider the small scale effect. Results indicate the influences of various parameters such as the small scale, elastic medium, 2D magnetic field, velocity and viscosity of fluid and volume fraction of carbon nanotube (CNT). The result of this study can be useful in micro structure and construction industries.
Waves,Beams,Fibre reinforced composites,Piezoelectricity,Fluid dynamics,magnetic field
http://jsm.iau-arak.ac.ir/article_542571.html
http://jsm.iau-arak.ac.ir/article_542571_a432c2fec35851c3b4eccdc09be9f695.pdf
Islamic Azad University - Arak Branch
Journal of Solid Mechanics
2008-3505
2008-7683
10
2
2018
06
30
Combination Resonance of Nonlinear Rotating Balanced Shafts Subjected to Periodic Axial Load
249
262
EN
M.S
Qaderi
Department of Mechanical Engineering, Faculty of Engineering, Kharazmi University, Tehran, Iran
S.A.A
Hosseini
Department of Mechanical Engineering, Faculty of Engineering, Kharazmi University, Tehran, Iran
ali.hosseini@khu.ac.ir
M
Zamanian
Department of Mechanical Engineering, Faculty of Engineering, Kharazmi University, Tehran, Iran
Dynamic behavior of a circular shaft with geometrical nonlinearity and constant spin, subjected to periodic axial load is investigated. The case of parametric combination resonance is studied. Extension of shaft center line is the source of nonlinearity. The shaft has gyroscopic effect and rotary inertia but shear deformation is neglected. The equations of motion are derived by extended Hamilton principle and discretized by Galerkin method. The multiple scales method is applied to the complex form of equation of motion and the system under parametric combination resonance is analyzed. The attention is paid to analyze the effect of various system parameters on the shape of resonance curves and amplitude of system response. Furthermore, the role of external damping on combination resonance of linear and nonlinear systems is discussed. It will be shown that the external damping has different role in linear and nonlinear shaft models. To validate the perturbation results, numerical simulation is used.
Rotating Shaft,Parametric excitation,Multiple scales method
http://jsm.iau-arak.ac.ir/article_542575.html
http://jsm.iau-arak.ac.ir/article_542575_40794426486874809b7e13528e3317ca.pdf
Islamic Azad University - Arak Branch
Journal of Solid Mechanics
2008-3505
2008-7683
10
2
2018
06
30
Fracture Analysis of Externally Semi-Elliptical Crack in a Spherical Pressure Vessel with Hoop-Wrapped Composite
263
270
EN
H
Eskandari
Abadan Institute of Technology, Petroleum University of Technology, Abadan, Iran
eskandari@put.ac.ir
Gh
Rashed
Abadan Institute of Technology, Petroleum University of Technology, Abadan, Iran
F
Mirzade
Abadan Institute of Technology, Petroleum University of Technology, Abadan, Iran
In this paper the effect of composite hoop-wrapped on stress intensity factor for semi-elliptical external crack which located in spherical pressure vessel, were investigated through the Finite Element Analysis. In order to find the effect of some parameters such as composite thickness and width, internal pressure and crack geometry, comparisons between different cases were done and discussed in detail. The result show that repairing crack with composite hoop-wrapped, can significantly reduce the stress intensity factor along the crack front.
Stress intensity factor,Semi-Elliptical Crack,Spherical pressure vessel,Composite layer
http://jsm.iau-arak.ac.ir/article_542579.html
http://jsm.iau-arak.ac.ir/article_542579_7b8b1d04d0eb0824f6b7d46e58d6e224.pdf
Islamic Azad University - Arak Branch
Journal of Solid Mechanics
2008-3505
2008-7683
10
2
2018
06
30
Mathematical Modeling for Thermoelastic Double Porous Micro-Beam Resonators
271
284
EN
R
Kumar
Department of Mathematics, Kurukshetra University, Kurukshetra, Haryana, India
rajneesh_kuk@rediffmail.com
R
Vohra
Department of Mathematics& Statistics, H.P.University, Shimla, HP, India
richavhr88@gmail.com
M.G
Gorla
Department of Mathematics& Statistics, H.P.University, Shimla, HP, India
In the present work, the mathematical model of a homogeneous, isotropic thermoelastic double porous micro-beam, based on the Euler-Bernoulli theory is developed in the context of Lord-Shulman [1] theory of thermoelasticity. Laplace transform technique has been used to obtain the expressions for lateral deflection, axial stress, axial displacement, volume fraction field and temperature distribution. A numerical inversion technique has been applied to recover the resulting quantities in the physical domain. Variations of axial displacement, axial stress, lateral deflection, volume fraction field and temperature distribution with axial distance are depicted graphically to show the effects of porosity and thermal relaxation time. Some particular cases are also deduced.
Double porosity,Thermoelasticity,Lord-shulman theory,Micro-beam
http://jsm.iau-arak.ac.ir/article_542582.html
http://jsm.iau-arak.ac.ir/article_542582_60eab3e151d683ac70a33297b20148cc.pdf
Islamic Azad University - Arak Branch
Journal of Solid Mechanics
2008-3505
2008-7683
10
2
2018
06
30
In-Plane and out of Plane Free Vibration of U-Shaped AFM Probes Based on the Nonlocal Elasticity
285
299
EN
M
Ghadiri
Faculty of Engineering, Department of Mechanics, Imam Khomeini International University, Qazvin, Iran
ghadiri@eng.ikiu.ac.ir
S.A.H
Hosseini
Department of Mechanics, Zanjan University, Zanjan, Iran
M
Karami
Faculty of Engineering, Department of Mechanics, Imam Khomeini International University, Qazvin, Iran
M
Namvar
Faculty of Engineering, Department of Mechanics, Imam Khomeini International University, Qazvin, Iran
Atomic force microscope (AFM) has been developed at first for topography imaging; in addition, it is used for characterization of mechanical properties. Most researches have been primarily focused on rectangular single-beam probes to make vibration models simple. Recently, the U-shaped AFM probe is employed to determine sample elastic properties and has been developed to heat samples locally. In this study, a simplified analytical model of these U-shaped AFM is described and three beams have been used for modelling this probe. This model contains two beams are clamped at one end and connected with a perpendicular cross beam at the other end. The beams are supposed only in bending flexure and twisting, but their coupling allows a wide variety of possible dynamic behaviors. In the present research, the natural frequency and sensitivity of flexural and torsional vibration for AFM probes have been analyzed considering influence of scale effect. For this purpose, governing equations of dynamic behavior of U-shaped AFM probe are extracted based on Eringen's theory using Euler–Bernoulli beam theory and an analytical method is employed to solve these equations. The results in this paper have been extracted for different values of nonlocal parameters; it is shown that for a special case, there is a good agreement between reported results in available references and our results. The obtained results show that the frequencies of U-shaped AFM decrease with increasing the nonlocal parameter.
U-shaped probe,AFM,Nonlocal elasticity theory,Euler–Bernoulli beam theory,Vibration analysis
http://jsm.iau-arak.ac.ir/article_542583.html
http://jsm.iau-arak.ac.ir/article_542583_3c297b026db27a389c459b3ff9826c2e.pdf
Islamic Azad University - Arak Branch
Journal of Solid Mechanics
2008-3505
2008-7683
10
2
2018
06
30
Determination of Optimal Parameters for Finite Plates with a Quasi-Square Hole
300
314
EN
M
Jafari
Department of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran
m_jafari821@shahroodut.ac.ir
M.H
Bayati Chaleshtari
Department of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran
E
Ardalani
Department of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran
This paper aims at optimizing the parameters involved in stress analysis of perforated plates, in order to achieve the least amount of stress around the square-shaped holes located in a finite isotropic plate using metaheuristic optimization algorithms. Metaheuristics may be classified into three main classes: evolutionary, physics-based, and swarm intelligence algorithms. This research uses Genetic Algorithm (GA) from evolutionary algorithm category, Gravitational Search Algorithm (GSA) from physics-based algorithm category and Bat Algorithm (BA) from Swarm Intelligence (SI) algorithm category. The results obtained from the present study necessitate the determination of the actual boundary between finite and infinite plate for the plates with square-shaped holes. The design variables such as bluntness, hole orientation, and plate dimension ratio as effective parameters on stress distribution are investigated. The results obtained from comparing BA, GA and GSA indicate that BA as SI algorithm category competitive results, proper convergence to global optimal solution and more optimal stress level than the two mentioned algorithms. The obtained results showed that the aforementioned parameters have a significant impact on stress distribution around a square-shaped holes and that the structure’s load-bearing capability can be increased by proper selection of these parameters without needing any change in material properties.
Isotropic finite plate,Analytical solution,Complex variable method,Metaheuristic Algorithms
http://jsm.iau-arak.ac.ir/article_542586.html
http://jsm.iau-arak.ac.ir/article_542586_ca0a929a0c871b3eb17037e370f1d82b.pdf
Islamic Azad University - Arak Branch
Journal of Solid Mechanics
2008-3505
2008-7683
10
2
2018
06
30
Analytical Solutions of the FG Thick Plates with In-Plane Stiffness Variation and Porous Substances Using Higher Order Shear Deformation Theory
315
325
EN
M
karimi darani
Department of Engineering, Colleg of Engineering, Fereydan Brabch , Islamic Azad University, Isfahan, Iran
karimidarani@gmail.com
A
Ghasemi
Department of Engineering, Colleg of Engineering, Fereydan Brabch , Islamic Azad University, Isfahan, Iran
This paper presents the governing equations on the rectangular plate with the variation of material stiffness through their thick using higher order shear deformation theory (HSDT). The governing equations are obtained by using Hamilton's principle with regard to variation of Young's modulus in through their thick with regard sinusoidal variation of the displacement field across the thickness. In addition, the effects of the substances in FG-porous plate are investigated.
Functionally Graded Materials,Navier solution,Porous material,Rectangular plate
http://jsm.iau-arak.ac.ir/article_542590.html
http://jsm.iau-arak.ac.ir/article_542590_76d26710c24bbc926f13c77bae314500.pdf
Islamic Azad University - Arak Branch
Journal of Solid Mechanics
2008-3505
2008-7683
10
2
2018
06
30
Stress Analysis in Thermosensitive Elliptical Plate with Simply Supported Edge and Impulsive Thermal Load
326
337
EN
V
Varghese
M.G. College, Armori, Gadchiroli, India
P
Bhad
Priyadarshini J. L., College of Engineering, Nagpur, India
praash.bhad@gmail.com
L
Khalsa
M.G. College, Armori, Gadchiroli, India
The paper concerns the thermoelastic problems in a thermosensitive elliptical plate subjected to the activity of a heat source which changes its place on the plate surface with time. The solution of conductivity equation and the corresponding initial and boundary conditions is obtained by employing a new integral transform technique. In addition, the intensities of bending moments, resultant force, etc. are formulated involving the Mathieu and modified functions and their derivatives. The analytical solution for the thermal stress components is obtained in terms of resultant forces and resultant moments.
Elliptical plate,Thermosensitive,Temperature distribution,Thermal stresses,Mathieu function,Thermal moment
http://jsm.iau-arak.ac.ir/article_542593.html
http://jsm.iau-arak.ac.ir/article_542593_2c148ffdb139e5a8a7ce379cb77246af.pdf
Islamic Azad University - Arak Branch
Journal of Solid Mechanics
2008-3505
2008-7683
10
2
2018
06
30
Fatigue Life of Graphite Powder Mixing Electrical Discharge Machining AISI D2 Tool Steel
338
353
EN
A
Al-Khazraji
Mechanical Engineering Department, University of Technology, Baghdad, Iraq
S.A
Amin
Mechanical Engineering Department, University of Technology, Baghdad, Iraq
S.M
Ali
Biomedical Engineering Department, University of Technology, Baghdad, Iraq
saad.eng@uokerbala.edu.iq
The present paper deals with the design of experimental work matrices for two groups of experiments by using Response surface methodology (RSM). The first EDM group was dealt with the use of kerosene dielectric alone, while the second was treated by adding the graphite micro powders mixing to dielectric fluid (PMEDM). The total heat flux generated and fatigue lives after EDM and PMEDM models were developed by FEM using ANSYS 15.0 software. The graphite electrodes gave a total heat flux higher than copper electrodes by (82.4 %). The use of graphite powder and both electrodes yielded more heat flux by (270.1 %) and (102.9 %) than the copper and graphite electrodes, respectively with use of kerosene dielectric alone. Using graphite electrodes and kerosene dielectric alone improved the WLT by (40.0 %) when compared with the use of copper electrodes. Whereas, using copper electrodes and the graphite powder improved the WLT by (66.7 %) compared with the use of graphite electrodes under the same machining conditions. Copper electrodes with graphite powder gave experimental fatigue safety factor higher by (30.38 %) when compared with using graphite electrodes and higher by (15.73%) and (19.77%) when compared with using the copper and graphite electrodes and kerosene dielectric alone, respectively.
EDM,PMEDM,Graphite powder,RSM,ANOVA,FEM,AISI D2 Die Steel,WLT,Total heat flux,Fatigue Life,Fatigue safety factors
http://jsm.iau-arak.ac.ir/article_542594.html
http://jsm.iau-arak.ac.ir/article_542594_f8b7392eb38fefce700850cd9e9dcd4d.pdf
Islamic Azad University - Arak Branch
Journal of Solid Mechanics
2008-3505
2008-7683
10
2
2018
06
30
Engineering Critical Assessments of Marine Pipelines with 3D Surface Cracks Considering Weld Mismatch
354
363
EN
S.M.H
Sharifi
Department of Offshore Structures Engineering, Faculty of Marine Science, Petroleum University of Technology, Abadan, Iran
sharifi@put.ac.ir
M
Kaveh
Department of Offshore Structures Engineering, Faculty of Marine Science, Petroleum University of Technology, Abadan, Iran
H
Saeidi Googarchin
Automotive Fluids and Structures Analysis Research Laboratory, School of Automotive Engineering, University of Science and Technology, Tehran, Iran
Offshore pipelines are usually constructed by the use of girth welds, while welds may naturally contain flaws. Currently, fracture assessment procedures such as BS 7910 are based on the stress-based methods and their responses for situations with large plastic strain is suspicious. DNV-OS-F101 with limited modifications proposes a strain-based procedure for such plastic loads. In this paper 3D nonlinear elastic-plastic finite element analyses using the ABAQUS software are performed in order to compare existing stress- and strain-based procedures beside newly strain-based method which is called CRES approach in order to improve the criteria used in current guidelines particularly at large plastic strains. It is concluded that although BS 7910 values are closer to finite element results than other methods in elastic region, but it is still conservative. In the area of large plastic strain, CRES method is very less conservative in both case of with and without internal pressure in comparison to others. The comparison of numerical simulation results with those available experimental data reveals a good agreement.
Engineering critical assessment (ECA),Marine pipelines, Girth welds,Surface cracks,Weld mismatching,CTOD
http://jsm.iau-arak.ac.ir/article_542595.html
http://jsm.iau-arak.ac.ir/article_542595_dad4da1558093b54eb8ae6f2c01a4f99.pdf
Islamic Azad University - Arak Branch
Journal of Solid Mechanics
2008-3505
2008-7683
10
2
2018
06
30
Optimal Locations on Timoshenko Beam with PZT S/A for Suppressing 2Dof Vibration Based on LQR-MOPSO
364
386
EN
M
Hasanlu
Department of Mechanical Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran
A
Bagheri
Department of Mechanical Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran
bagheri@guilan.ac.ir
Neutralization of external stimuli in dynamic systems has the major role in health, life, and function of the system. Today, dynamic systems are exposed to unpredicted factors. If the factors are not considered, it will lead to irreparable damages in energy consumption and manufacturing systems. Continuous systems such as beams, plates, shells, and panels that have many applications in different industries as the main body of a dynamic system are no exceptions for the damages, but paying attention to the primary design of model the automatic control against disturbances has highly met the objectives of designers and also has saved much of current costs. Beam structure has many applications in constructing blades of gas and wind turbines and robots. When it is exposed to external loads, it will have displacements in different directions. Now, it is the control approach that prevents from many vibrations by designing an automated system. In this study, a cantilever beam has been modeled by finite element and Timoshenko Theory. Using piezoelectric as sensor and actuator, it controls the beam under vibration by LQR controller. Now, in order to increase controllability of the system and reduce the costs, there are only spots of the beam where most displacement occurs. By controlling the spots and applying force on them, it has the most effect on the beam. By multi-objective particle swarm optimization or MOPSO algorithm, the best weighting matrices coefficients of LQR controller are determined due to sensor and actuator displacement or the beam vibration is controlled by doing a control loop.
Keywords : Vibration attenuation,Timoshenko beam,Optimal placement,PZT patches,LQR controller,Multi-objective particle swarm optimization
http://jsm.iau-arak.ac.ir/article_542596.html
http://jsm.iau-arak.ac.ir/article_542596_889f399f30a9bdc74cc4e2c7d23e7a2a.pdf
Islamic Azad University - Arak Branch
Journal of Solid Mechanics
2008-3505
2008-7683
10
2
2018
06
30
Vibration Suppression of Simply Supported Beam under a Moving Mass using On-Line Neural Network Controller
387
399
EN
S
Rezaei
University of Applied Science and Technology, Center of Mammut, Tehran, Iran
sara_r759@yahoo.com
M
Pourseifi
Faculty of Engineering, The University of Imam Ali, Tehran, Iran
In this paper, model reference neural network structure is used as a controller for vibration suppression of the Euler–Bernoulli beam under the excitation of moving mass travelling along a vibrating path. The non-dimensional equation of motion the beam acted upon by a moving mass is achieved. A Dirac-delta function is used to describe the position of the moving mass along the beam and its inertial effects. Analytical solution the equation of motion is presented for simply supported boundary condition. The hybrid controller of system includes of a controller network and an identifier network. The neural networks are multilayer feed forward and trained simultaneously. The performance and robustness of the proposed controller are evaluated for various values mass ratio of the moving mass to the beam and dimensionless velocity of a moving mass on the time history of deflection. The simulations verify effectiveness and robustness of controller.
Vibration control,Neural network controller,Euler–Bernoulli beam theory,Moving mass
http://jsm.iau-arak.ac.ir/article_542597.html
http://jsm.iau-arak.ac.ir/article_542597_726946e939564f3d26d0e0a60b18d4e8.pdf
Islamic Azad University - Arak Branch
Journal of Solid Mechanics
2008-3505
2008-7683
10
2
2018
06
30
Free Vibration Analysis of Non-Uniform Circular Nanoplate
400
415
EN
M
Zarei
Department of Mechanical Engineering, Tarbiat Modares University (TMU), Tehran, Iran
mehdi.zarei@modares.ac.ir
M
Ghalami-Choobar
Department of Mechanical Engineering, Tarbiat Modares University (TMU), Tehran, Iran
G.H
Rahimi
Department of Mechanical Engineering, Tarbiat Modares University (TMU), Tehran, Iran
G.R
Faghani
Department of Mechanical Engineering, Khatam Al Anbia Air Defense University,Tehran, Iran
In this paper, axisymmetric free vibration analysis of a circular Nano-plate having variable thickness was studied. The variation in thickness of plate was considered as a linearly in radial direction. Nonlocal elasticity theory was utilized to take into account size-dependent effects. Ritz functions was utilized to obtain the frequency equations for simply supported and clamped boundary. To verify accuracy of Ritz method, differential transform method (DTM) also used to drive the size dependent natural frequencies of circular nano-plates. The validity of solutions was performed by comparing present results with those of the literature for both classical plate and nano plate. Effect of nonlocal parameter, mode number and taper parameter on the natural frequency are investigated. Results showed that taper parameter has significant effect on the non-dimensional frequency and its effects on the clamped boundary condition is more than simply support.
Nonlocal theory,Axisymmetric vibration,Variable thickness plate,Ritz method,Differential transform method
http://jsm.iau-arak.ac.ir/article_542598.html
http://jsm.iau-arak.ac.ir/article_542598_f89a5410321fe2b3941f671469eeb54b.pdf
Islamic Azad University - Arak Branch
Journal of Solid Mechanics
2008-3505
2008-7683
10
2
2018
06
30
Transversely Isotropic Magneto-Visco Thermoelastic Medium with Vacuum and without Energy Dissipation
416
434
EN
R
Kumar
Department of Mathematics, Kurukshetra University, Kurukshetra, Haryana , India
rajneesh_kuk@rediffmail.com
P
Kaushal
Research Scholar ,IKG Panjab Technical University, Kapurthala ,Punjab, India
ms.priyankakaushal@gmail.com
R
Sharma
Department of Mathematics, DAVIET, Jalandhar ,Punjab, India
In the present investigation the disturbances in a homogeneous transversely isotropic magneto-Visco thermoelastic rotating medium with two temperature due to thermomechanical sources has been addressed. The thermoelasticity theories developed by Green-Naghdi (Type II and Type III) both with and without energy dissipation has been applied to the thermomechanical sources. The Laplace and Fourier transform techniques have been applied to solve the present problem. As an application, the bounding surface is subjected to concentrated and distributed sources (mechanical and thermal sources). The analytical expressions of displacement, stress components, temperature change and induced magnetic field are obtained in the transformed domain. Numerical inversion techniques have been applied to obtain the results in the physical domain. Numerical simulated results are depicted graphically to show the effect of viscosity on the resulting quantities. Some special cases of interest are also deduced from the present investigation.
Transversely isotropic,Magneto-Visco thermoelastic,Laplace transform,Fourier transform,Concentrated and distributed sources,Rotation
http://jsm.iau-arak.ac.ir/article_542599.html
http://jsm.iau-arak.ac.ir/article_542599_6e0cb7009520cb23fcc3557f34deb212.pdf
Islamic Azad University - Arak Branch
Journal of Solid Mechanics
2008-3505
2008-7683
10
2
2018
06
30
Thermoelastic Fracture Parameters for Anisotropic Plates
435
449
EN
S
Kebdani
Laboratoire de Mécanique Appliquée , Université des Sciences et de la Technologie d’Oran , Alegria
mechanics184@yahoo.com
A
Sahli
Laboratoire de Mécanique Appliquée , Université des Sciences et de la Technologie d’Oran , Alegria----
Laboratoire de Recherche des Technologies Industrielles , Université Ibn Khaldoun de Tiaret , Alegria
S
Sahli
Laboratoire de Recherche des Technologies Industrielles , Université Ibn Khaldoun de Tiaret , Alegria
This paper deals with the determination of the effect of varying material properties on the value of the stress intensity factors, <em>K<sub>I</sub></em> and <em>K<sub>II</sub></em>, for anisotropic plates containing cracks and subjected to a temperature change. Problems involving cracks and body forces, as well as thermal loads are analysed. The quadratic isoperimetric element formulation is utilized, and SIFs may be directly obtained using the ‘traction formula’ and the ‘displacement formula’. Three cracked plate geometries are considered in this study, namely: (1) a plate with an edge-crack; (2) a plate with a double edge-crack; (3) a plate with symmetric cracks emanating from a central hole. Where appropriate, finite element method (FEM) analyses are also performed in order to validate the results of the BEM analysis. The results of this study show that, for all crack geometries, the mode-I stress intensity factor, <em>K</em><em>∗</em><em>I</em> decreases as the anisotropy of the material properties is increased. Additionally, for all these cases, <em>K</em><em>∗</em><em>I</em> decreases as the angle of orientation of the material properties, , increases with respect to the horizontal axis. The results also show that BEM is an accurate and efficient method for two-dimensional thermoelastic fracture mechanics analysis of cracked anisotropic bodies.
Boundary element method,Stress intensity factors,Anisotropy
http://jsm.iau-arak.ac.ir/article_542600.html
http://jsm.iau-arak.ac.ir/article_542600_614bf77647c1d5112896f07027cd9dd8.pdf
Islamic Azad University - Arak Branch
Journal of Solid Mechanics
2008-3505
2008-7683
10
2
2018
06
30
Elastic-Plastic Transition of Pressurized Functionally Graded Orthotropic Cylinder using Seth’s Transition Theory
450
463
EN
S
Sharma
Department of Mathematics, Jaypee Institute of Information Technology, Noida, India
sanjiit12@rediffmail.com
R
Panchal
Department of Mathematics, Jaypee Institute of Information Technology, Noida, India
In this paper the radial deformation and the corresponding stresses in a functionally graded orthotropic hollow cylinder with the variation in thickness and density according to power law and rotating about its axis under pressure is investigated by using Seth's transition theory. The material of the cylinder is assumed to be non-homogeneous and orthotropic. This theory helps to achieve better agreement between experimental and theoretical results. Results has been mentioned analytically and numerically. From the analysis, it has been concluded that cylinder made up of orthotropic material whose thickness increases radially and density decreases radially is on the safer side of the design as circumferential stresses are high for cylinder made up of isotropic material as compared to orthotropic material. This paper is based on elastic-plastic behavior which plays important role in practical design of structures for safety factor.
Elastic-plastic,Orthotropic,Pressure,Functionally graded material,Cylinder
http://jsm.iau-arak.ac.ir/article_542601.html
http://jsm.iau-arak.ac.ir/article_542601_f94320312aac1e599c5c8765c0e94f0b.pdf