ORIGINAL_ARTICLE
Analysis of Roll Wear in Reshaping Using Finite Element Simulation
Reshaping process is a widely used method for producing tubes with non-circular cross sections. Owing to the friction between pipe and rolls, initial round pipe moves forward and consequently, it gradually formed into square or rectangular one. In practice, geometric profile of the rolls will be changed after a while. These changes would be detrimental the production of faultless products. Therefore, in this paper the reshaping process is studied considering wear phenomena on the rolls. This study is a co-operation with a related industry at which square tubes are produced using reshaping process. In order to investigate the production line, considering industrial datasheets, the process is modeled by means of a commercial FEM package, ABAQUS\Explicit. The reshaping process is simulated as a 3D model and subsequently the sustainable regions to wear are investigated. The influences of significant parameters such as material and thickness of strip, as well as friction coefficient on the worn area, are studied. At the end, the FEM reults are comprised with the experiments reults and a good consistency between them is seen.
http://jsme.iaukhsh.ac.ir/article_515470_e998695bb564257b61bdc14d6b5b0654.pdf
2009-06-22
1
9
Reshaping
Non-circular cross- section
Roll Wear
Finite Element Simulation
Mehdi
Salmani Tehrani
tehrani-m@eng.sku.ac.ir
1
Assistant Professor, Mechanical Engineering Department, Shahrekord University
LEAD_AUTHOR
Reza
Khodabande Shahraki
2
M.Sc. Student, Mechanical Engineering Department, Islamic Azad university, Khomeinishahr Branch
AUTHOR
Hesam
Validi
3
M.Sc., Tarbiat Modares University
AUTHOR
[1] Kiuchi M., Feizhou W., Reshaping of Round Pipes into Square and Rectangular Pipes, Tube & Pipe Technology, November / December 1999.
1
[2] Hutchings I.M., Tribology, Friction and Wear of Engineering Materials, 1992.
2
[3] Masen M., Abrasive Tool Wear in Metal Forming Processes, Ph.D. Thesis, University of Twente, Enschede, The Netherlands, September 2004.
3
[4] ASM International Handbook Committee, Friction, Lubrication, and Wear Technology, Volume 18, 1992 .
4
[5] Haffmann H., Hwang C., Ersoy A., Advanced Wear Simulation in Sheet Metal Forming, Institute of Metal Forming and Casting, 2002.
5
[6] Mentor, Spilit Rolls, Solutions for the tube, Pipe&Roll Form Industries, Ohio, USA, 2006.
6
[7] Hegadekatte v., Huber N., Kraft O., Finite element based simulation of dry sliding wear, Modeling Simul. Mater. Sci. Eng. 13, 2004,
7
pp. 57-75.
8
[8] ABAQUS User Guid, ABAQUS Analysis User's Manual.
9
ORIGINAL_ARTICLE
Analysis of PVC Frames Cutting by Guillotine and Presenting Solution on Preventing Imperfection
PVC frame cutting process by guillotine is a common method that attracted attention of car parts and PVC decorating furniture producers. In this paper, the effects of main parameters such as cutting speed, lubricants and cutting frame holder pressure force on PVC frame section surface smoothness is investigated by experimental methods on a specified PVC frame sample and then by FEM simulation using ABAQUS 6.8 software. The results obtained by experimental methods and software simulation show intense effect of these parameters on the PVC frame section surface smoothness and cutting force. Finally, based on the experimental works, some solutions are suggested to improve the cutting quality.
http://jsme.iaukhsh.ac.ir/article_515472_3ba5ca22e0fe0d546f46601a194250c9.pdf
2009-06-22
11
17
Cutting process
Surface smoothness
PVC frame
FEM
Saeed
Shiri
1
M.Sc. Student, Islamic Azad University, Najafabad Branch
AUTHOR
Mehran
Moradi
moradi@cc.iut.ac.ir
2
Assistant Professor, Mechanical Engineering Department, Isfahan University of Technology
LEAD_AUTHOR
[1] Semsarzadeh A., Mehrabzadeh M., Mechanical and Thermal Properties of the Plasticized PVC-ESBO, Iranian polymer journal, no.14, 2006, pp.769-773.
1
[2] Gedde U., Polymer Physics, Chapman and hall, 1995.
2
[3] Jastrzebski Z. D., The Nature and Properties of Engineering Materials, 3rd ed., John Wiley and Sons, 1987.
3
[4] Lemaitre J., Desmorat R., Engineering Damage Mechanics, Springer-Verlag, Berlin Heidelberg, Printed in The Netherlands, 2005.
4
[5] اعلائی ج.، خوش نیت ع. ، رحمت پور ع. ، مطالعه خواص فیزیکی، مکانیکی و اشتغال پذیری آلیاژ ABS/PVC ، مجله پژوهش نفت، سال هجدهم ، شماره 57، 1387، صص 61-52.
5
[6] باقری ر.، مبانی خواص مکانیکی پلاستیکها ساختار مواد، انتشارات جهاد دانشگاهی واحد صنعتی اصفهان، 1381، صص 82-111.
6
[7] گنجی، کاربرد مواد PVC در صنعت، انتشارات نوپردازان، 1386، صص22-43.
7
ORIGINAL_ARTICLE
Thermal Buckling Analysis of Circular FGM Plate with Actuator/Actuator Piezoelectric Layer Based on Neutral Plane
In this paper, the thermal buckling analysis of a circular plate made of FGM materials with actuator/actuator piezoelectric layers based on neutral plane, classical plate theory and first order shear deformation plate theory is investigated. Reddy's model is assumed for material properties of FGM plate. Plate under the thermal loading, nonlinear temperature rise through the thickness and clamped edges is considered. Equilibrium and stability equations are drived using the calculus of variations and applying Euler equations. The obtained results are compared with the numerical values of the critical buckling temperature based on the theories mentioned above, and good agreement is observed between them.
http://jsme.iaukhsh.ac.ir/article_515477_db7c9845cb0cc6046d0e8e18ba8af4bd.pdf
2009-06-22
19
33
: Thermal buckling
Piezoelectric layers
Circular plate
FGM
M. M.
Najafizadeh
m-najafizadeh@iau-arak.ac.ir
1
Associate Professor, Islamic Azad University, Arak Branch
LEAD_AUTHOR
M.
Malmorad
2
.Sc., Mechanical Engineering, Office of Standards and Industrial Research in Kermanshah
AUTHOR
A.
Sharifi
3
M.Sc., Mechanical Engineering, Kermanshah Oil Company.
AUTHOR
[1] Koizumi.M. , Niino.M. , Miyamoto.Y, FGM research programs in Japan-from structural to Functional uses. Functionally Graded Materials, 1996-1997, pp 1-8.
1
[2] Samsam Shariat B.A., Eslami M.R., Buckling of thick functionally graded plates under mechanical and thermal loads, Composite Structurs, 78, 2007, pp. 433-439.
2
[3] Zhong H., GuC., Buckling of symmetrical
3
cross-ply composite rectangular plates under a linearly varying in-plane load, Composite Structures ,80, 2007, pp. 42-48.
4
[4] Batra. R.C, Wei Z., Dynamic buckling of a thin thermoviscoplastic rectangular plate, Thin-Walled Structures, 43, 2, 2005, pp. 273-290.
5
[5] Eslami M.R., Mossavarali A., Peydaye Saheli G., Thermoelastic buckling of Isotropic and Orthotropic Plates with Imperfections, Journal Of Thermal Stresses, 23, 9, 2000, pp. 853-872.
6
[6] Najafizadeh. M.M., Eslami.M.R., First-Order-Theory-Based Thermoelastic Stability of Functionally Graded Material Circular Plates, AIAA Journal, 40, 7, 2002, pp 1444-1450.
7
[7] Najafizadeh. M.M., Eslami M.R., Buckling Analysis of Circular Plates of Functionally Graded Materials under Uniform Radial compression, International Journal of Mechanical Science, Volume 44, Issue 12, 2002, pp. 2479-2493.
8
[8] Javaheri.R, Eslami.M.R, Thermal Bucking of Functionally Graded Plates, AIAA Journal, 40, 1, 2002, pp 162-169.
9
[9] Javaheri.R., Eslami M.R., Bucking of Functionally Graded Plates under in–plane Compressive Loading, ZAMM-Journal of Applied Mathematics, 82, 4, 2002, pp. 277-283.
10
[10] Javaheri R., Eslami M.R., Thermal Bucking of Functionally Graded Plates Based on Higher Order Theory, Journal of thermal Stresses, 25, 7, 2002, pp. 603-625.
11
[11] Najafizadeh M.M., Heydari H.R., Thermal Buckling of Functionally Graded Circular Plates Based on Higher Order Shear Deformation Plate Theory, European Journal of Mechanics-A/Solids, 23, 6, 2004, pp. 1085-1100.
12
[12] Najafizadeh M.M., Heydari H.R., An Exact Solution For Buckling of Functionally Graded Circular Plates Based on Higher Order Shear Deformation Plates Theory Under Uniform Radial Compression, International Journal of Mechanical Sciences, 50, 3, 2008, pp. 603-612.
13
[13] Ma L.S., Wang T.J., Nonlinear Bending and Post-buckling of a Functionally Graded Circular Plates under Mechanical and Thermal Loading, International Journal of Solids and Structures, 40, 13-14, 2003, pp. 3311-3330.
14
[14] Tiersten. H.F., Linear Piezoelctric Plate Vibration, Plenum Press, Newyork, 1969.
15
[15] Reddy J.N., Phan N.D., Stability and Vibration of Isotropic, Orthotropic and Laminated Plates According to a Higher-Order Shear Deformation Theory, Journal Of Sound and Vibration, 98, 2, 1985, pp. 157-170.
16
[16] Aldraihem.O.J, Khdeir.A.A, Exact deflection solutions of Beams With Shear Piezoelectric Actuators, International Journal of Solids and Structures, 40, 1, 2003, pp. 1-12.
17
[17] Wang Z., Chen S.H., Han W., The Static Shape Control for Intelligent Structures, Journal of Finite Element in Analysis and Design, 26, 4, 1997, pp. 303-314.
18
[18] Robbins D.H., Reddy J.N., Analysis of a Piezoelectrically Actuated Beams using a Layer-Wise Displacement Theory, Computers & Structures, 41, 2, 1991, pp. 265-279.
19
[19] MorimotoT., Tanigawa Y., Kawamura R., Thermal Buckling of Functionally Graded Rectangular Plates Subjected to Partial Heating, International Journal of Mechanical Sciences, 48, 9, 2006, pp. 926-937.
20
[20] Viliani N.S., Khalili S.M.R., Porrostami H., Buckling Analysis of FG Plate with Smart Sensor/Actuator, Journal of Solid Mechanical, 1, 3, 2009, pp. 201-212.
21
[21] Lien. W.C., Chung. Y.L., Ching C.W., Dynamic Stability Analysis and Control of a Composite Beam with Piezoelectric Layers, Composite Structures, 56, 2002, pp. 97-109.
22
[22] Halliday H., Resnick R., Walker J., Fundamentals of Physics, Wiley, New York, Extended Sixth Edition, 2000.
23
[23] Brush D.O., Almorth. B.O., Buckling of
24
Bars-Plate and shells, McGraw Hill , New York, 1975.
25
[24] Meyers. C.A, Hyer. M.W., Thermal Buckling and Postbuckling of Symmetrically Laminated Composite Plates, Journal of Thermal Stresses, Colume, 14, 4, 1999, pp. 519-540.
26
ORIGINAL_ARTICLE
Elastic Buckling Analysis of Composite Shells with Elliptical Cross-section under Axial Compression
In the present research, the elastic buckling of composite cross-ply elliptical cylindrical shells under axial compression is studied through finite element approach. The formulation is based on shear deformation theory and the serendipity quadrilateral eight-node element is used to study the elastic behavior of elliptical cylindrical shells. The strain-displacement relations are accurately accounted for in the formulation in local coordinate system. The contributions of the work done by applied load are also incorporated. The obtained governing equations by the principle of minimum potential energy is solved through eigenvalue approach. The influence of elliptical cross-sectional parameters on the critical buckling loads of elliptical cylindrical shells is examined .Results show that changes in the elliptical cross-sectional parameters significantly change critical buckling loads of the elliptical cylindrical shells.
http://jsme.iaukhsh.ac.ir/article_515479_11efe310886066d039298958323dedee.pdf
2009-06-22
35
46
Composite shells
Critical buckling load
Finite Element
First order shear deformation
Elliptical cross-section
Mansour
Darvizeh
1
Professor, University of Guilan
AUTHOR
Abolfazl
Darvizeh
2
Professor, Islamic Azad University, Bandar Anzali Branch
AUTHOR
Reza
Ansari
r_ansari@guilan.ac.ir
3
Assistant Professor, University of Guilan
LEAD_AUTHOR
Elham
Kazemi
4
M.Sc. Student, University of Guilan
AUTHOR
[1] Lorenz R., , Achsensymmetrische verzerrungen in dünnwandingen hohlzzylindern, Zeitschrift des Vereines Deutscher Ingenieure, 52 (43), 1908, pp.1706-1713.
1
[2] Donnell L.H., A new theory for the buckling of thin cylinders under axial compression and bending, Transactions of ASME, 56, 1934, pp. 795-806.
2
[3] VonKarman T., Tsien H.S., The buckling of thin cylindrical shells underaxial compression, Journal of Aeronautical Science, 8(6), 303-312.
3
[4] Donnel L.H., Wan C.C., , Effect of imperfections on the buckling of thin cylinders and columns under axial compression, Journal of Applied Mechanics (ASME), 17(1), 1950,pp. 73-83.
4
[5] Koiter W.T., Over der Stabiliteit van het Elastische Evenwicht, Ph.D. Thesis, Delft University, The Netherlands. (English: On the Stability of Elastic Equilibrium, 1945,NASA Report TT-F-10833, 1967.)
5
[6] Marguerre K., Stability of cylindrical shells of variable curvature, NACA TM, 1951, 1302.
6
[7] Kempner J., Chen Y.N., , Large deflections of an axially compressed oval cylindrical shell, In: Proceedings of the 11th International Congress on Applied Mechanics. Springer-Verlag, Berlin, 1964, pp. 299-306.
7
[8] Kempner J., Chen Y.N., Buckling and postbuckling of an axially compressed oval cylindrical shell, In: Symposium on the Theory of Shells to Honor Lloyd H. Donnell, McCuthan Publishers Co., 1967, pp. 141-183.
8
[9] Feinstein G., Chen Y.N., Kempner J., Buckling of clamped oval cylindrical shells under axial loads, AIAA Journal, 9 (9), 1971, pp.1733-1738.
9
[10] Feinstein G., Erickson B., Kempner J., Stability of oval cylindrical shells, Journal of Experimental Mechanics, 11(11), 1971, pp.
10
[11] Hutchinson J.W., Buckling and initial post-buckling behaviour of oval cylindrical shells under axial compression, Journal of Applied Mechanics(Transactions of ASME), 35(1), 1968, pp. 66-72.
11
[12] Tennyson R.C., Booton M., Caswell R.D., Buckling of imperfect elliptical cylindrical shells under axial compression, AIAA Journal, 9(2), 1971, pp. 250-255.
12
[13] Sun G., Buckling and initial post-buckling behaviour of laminated oval cylindrical shells under axial compression, Journal of Applied Mechanics(Transactions of ASME), 58, 1991,
13
pp. 848-851.
14
[14] Sheinman I., Firer M., Buckling analysis of laminated cylindrical shells with arbitrary non-circular cross-section, AIAA Journal, 32(5), 1994, pp. 648-654.
15
[15] Suzuki K., Shikanai G., Leissa A.W., Free vibrations of laminated composite thin
16
non-circular cylindrical shell, Journal of Applied Mechanics, 61, 1994, pp. 861-871.
17
[16] Soldatos K.P., Mechanics of cylindrical shells with non-circular cross-section, Applied Mechanics, 52, 1999, pp. 237-274.
18
[17] Meyers C.A., Hyer M.W., Response of elliptical composite cylinders to axial compression loading, Mechanics of Advanced Materials and Structures, 6(2), 1996, pp. 169-194.
19
[18] Sambandama C.T., Patel B.P., Gupta S.S., Munot C.S., Ganapathi M., Buckling characteristics of cross-ply elliptical cylinders under axial compression, Composite Structures, 62(1), 2003, pp. 7-17.
20
[19] Gardner L., Structural behaviour of oval hollow sections, International Journal of Advanced Steel Construction, 1(2), 2005, pp. 26-50.
21
[20] Chan T.M., Gardner L., Compressive resistance of hot-rolled elliptical hollow sections, Engineering Structures, 30 (2), 2008, pp. 522-532.
22
[21] Zhu Y., Wilkinson T., Finite element analysis of structural steel elliptical hollow sections in compression, Research Report No. R874, Centre for Advanced Structural Engineering, The University of Sydney, 2007.
23
[22] Kempner J., Some results on buckling and post-buckling of cylindrical shell, In: Collected Papers on Instability of Shell Structures. NASA TND, 1510, 1962,pp. 173-186.
24
[23] Almorth BO, Brogan FA, Marlowe MB., Collapse analysis of elliptic cones. Am Inst Aeronaut Astronaut J, 9, 1971, pp. 32-37.
25
[24] Bushnell D., Stress buckling and vibration of prismatic shells, Am Inst Aeronaut Astronaut J, 9, 1971, pp. 2004-2013.
26
[25] Chen YN, Kempner J., Buckling of oval cylindrical shell under compression and asymmetric bending, Am Inst Aeronaut Astronaut J, 14, 1976, pp. 1235-1240.
27
[26] Koroleva EM ., Stability of cylindrical shells of oval cross-section in the bending stress-state, Prikl Mat Mekh, 37, 1974, pp. 901-903.
28
[27] Volpe V, Chen YN, Kempner J., Buckling of orthogonally stiffened finite oval cylindrical shells shells under axial compression, Am Inst Aeronaut Astronaut J, 18, 1980, pp. 571-80.
29
[28] Semenyuk NP., Stability of non-circular cylindrical shells shells under axial compression, Sov Appl Mech, 20, 1984, pp. 813-818.
30
[29] Zienkiewicz O.C., Taylor R.L ., The finite element method, Volume 1: Solid Mechanics, Mc Graw-Hill , 1967.
31
[30] Bhaskar K., Varadan TK., A higher-order theory for bending analysis of laminated shells of revolutions, Comput Struct , 40, 1991, pp. 815-819.
32
[31] Suzuki K., Shikanai G., Leissa A.W., Free vibrations of laminated composite thick noncircular cylindrical shell, Int J Solids Struct, 1996, pp. 4079-4100.
33
[32] Kraus H., Thin elastic shells, New York, John Wiley, 1976.
34
ORIGINAL_ARTICLE
Study of the Frictional Surface Damage Using Acoustic Emission Method
In this study, the change at rubbing surfaces has been investigated experimentally using an acoustic emission signal monitoring system. A steel ring is slipped on the surface of a metallic sheet to simulate frictional conditions. The mechanical disturbances caused by the movement of the ring produce stress waves propagating along the sheet surface. The out of plane displacement of the sheet surface is sensed by a piezoelectric sensor. The electrical signal of the sensor output is received and used to analyze the frictional conditions between rubbing surfaces. The experimental results show that the effect of different frictional parameters such as normal load, surface material and lubrication on the surface damages can be recognized by analyzing the acoustic emission signals. For example, vanishing of the thin lubricant film between the two rubbing surfaces can be distinguished from the damage signals which are appeared with specific range of frequencies and amplitudes. The sensitivity of acoustic emission to detect frictional damages is considerably higher than that of monitoring of the friction coefficient.
http://jsme.iaukhsh.ac.ir/article_515483_b38eaedda678d26bac131e5d7c08c729.pdf
2009-06-22
47
55
Friction
Acoustic Emission
Rubbing
Condition Monitoring
Mehdi
Ahmadi
ahmadinajafabadi@iaud.ac.ir
1
Associate Professor, Mechanical Engineering Department, Islamic Azad University, Dezful Branch
LEAD_AUTHOR
[1]Baranov V.M., Kudryavtsev E.M., Sarychev G.A. and Schavelin V.M., Acoustic Emission in Friction, 1st ed. London, Elsevier Pub., 2007.
1
[2] ASMHandbook, Vol. 17, Nondestructive Evaluation, American Society for Testing and Materials (ASM International), 1994, pp.
2
[3] Jiaa C.L. and Dornfeld D.A., Experimental Studies of Sliding Friction and Wear via Acoustic Emission Signal Analysis, Wear 139, 1990, pp. 403-424.
3
[4] Belyi V.A., Kholsdilov O.V. ,Syirdyinik A.L., Acoustic spectrometry as used for the evaluation of tribological systems, Wear69, 1981, pp.
4
[5] Diei E.N., Investigation of the milling process using acoustic emission signal analysis, Ph.D. Thesis, Department of Mechanical Engineering, University of California, Los Angeles, 1979.
5
[6] Dornfeld D. A., Acoustic emission monitoring and analysis of manufacturing processes, 12th National Science Foundation Conf. On Production Research and Technology (May 1985), Presented at the proceedings, University of Wisconsin, Madison, WI, 1985, pp. 329-334.
6
[7] Liang S.Y. , Dornfeld D.A., Punch stretching processes monitoring using acoustic emission signal analysis, Part 1, Basic characteristics, J. of Acoustic Emission 6(1), 1987, pp. 29-36.
7
[8] Diei E.N. and Dornfeld D.A. Acoustic emission sensing of tool wear in face milling, J. Eng. Ind. 104, 1987, pp. 234-240.
8
[9] Masaki T., Use of acoustic emission for the study of wear, S.B. Thesis, Department of Mechanical Engineering, MIT, Cambridge, MA, 1986.
9
[10]Rangwala, S. and Dornfeld D.A., Application of acoustic emission sensing to the analysis of contact between rough metallic surfaces, ESRC Rep, 1988.
10
[11]Lingard S., An investigation of acoustic emission in sliding friction and wear of metals, Wear 130, 1989, 367.
11
[12] Hisakado, T. ,Warashina, T., Relationship between friction and wear propertied and acoustic emission characteristics: iron pin on hardened bearing steel disk, Wear 216, 1997, pp. 1-7.
12
Van der Heide E., Huis Veld A.J., The effect of
13
ORIGINAL_ARTICLE
Buckling of Rectangular Functionally Graded Material Plates under Various Edge Conditions
In the present paper, the buckling problem of rectangular functionally graded (FG) plate with arbitrary edge supports is investigated. The present analysis is based on the classical plate theory (CPT) and large deformation is assumed for deriving stability equations. The plate is subjected to bi-axial compression loading. Mechanical properties of FG plate are assumed to vary continuously along the thickness of the plate according to different volume of fraction functions of constituents. These functions are assumed to have power law distributions. The displacement function is assumed to have the form of double Fourier series, of which derivatives are legitimized using Stokes’ transformation method. The advantage of using this method is the capability of considering effect of any possible combination of boundary conditions on the buckling loads. The out-plane displacement distribution is assumed using Fourier Sinus Series. This results in a general eigenvalue problem which can be used for evaluating the buckling load under different edge conditions, plate aspect ratios and various volume fraction functions. For generality of problem, plate is elastically restrained using some rotational and translational springs at four edges. Some numerical examples are presented and compared the to numerical results of finite element method using ABAQUS and other researchers’ results to validate the proposed method. It has been shown that there is good agreement between them
http://jsme.iaukhsh.ac.ir/article_515487_d807651e13c685b29d92fa121ae424cd.pdf
2009-06-22
57
68
Buckling of rectangular plate
Functionally graded material
Stoke’s transformation method
Classical plate theory
Fourier series
Matin
Latifi
1
M.Sc, Mechanical Engineering Department, Islamic Azad University, Khomeinishahr Branch
AUTHOR
Fatemeh
Farhatnia
farhatnia@iaukhsh.ac.ir
2
Assistant Professor, Mechanical Engineering Department, Islamic Azad University, Khomeinishahr Branch
LEAD_AUTHOR
Mohmoud
Kadkhodaei
3
Assistant Professor, Mechanical Engineering Department, Isfahan University of Technology
AUTHOR
[1] Leissa A.W, Kang J.H., Exact solutions for vibration and buckling of an SS-C-SS-C rectangular plate loaded by linearly varying in-plane stresses, ASME, Vol.44,issue 9,2002, pp. 1925-1945
1
[2] Javaheri R., Eslami M.R., Buckling of functionally graded plates under in-plane compressive loading, Zamm .Z.Angew. Math Mech, Voll. 82, issue 4, 220, 2002, pp 277-283.
2
[3] Ni Q.Q., Xi J, Ivamoto M, Buckling analysis of composite laminated plates with arbitrary edge supports, Composite structures, Vol. 69, 2005, pp 209-217.
3
on a Higher-order Deformation Theory, J. Reinforced Plastics and Composites, Vol. 28, 2009, pp 1215-1234.
4
[5] Najafizadeh M.M., Mahdavian M., Superposition buckling analyses of rectangular Plates Composed of Functionally Graded materials subjected to non-uniform distributed In-plane loading, Proceedings of the Institution of Mechanical Engineers - Part C: J. Mechanical Engineering Science, Vol. 224, issue 11,2010, pp.2299-2308.
5
[7] Ansari R., Darvizeh M., Prediction of dynamic behaviour of FGM shells under arbitrary boundary conditions, Composite Structures, Vol. 85, 2008, pp. 284–292.
6
[8] Hyeong K.K., Moon S. K., An analytical method for calculating vibration characteristics of PWR fuel assembly with reactor end boundary conditions using fourier series, Transactions, SMIRT16, Washington DC, 2001, paper No.1445.
7
]9[ لطیفی م.، فرهت نیا ف.، کدخدایی م.، کاربرد روش تبدیل استوکس در تحلیل سازههای مکانیکی، دومین کنفرانس ملی مهندسی مکانیک، دانشگاه آزاد اسلامیواحد خمینی شهر، 1388.
8
[10] Zhang D.G., Zhou Y.H., A theoretical analysis of FGM thin plates based on physical neutral surface, Computational Material Science, 44, 2008, pp. 716-720.
9
[11] Timoshenko S., Goodier J., Theory of elasticity, McGraw-Hill, New York, 1971.
10
Chen C.S., Hsu C.Y., Tzou G.J., , Vibration and Stability of Functionally Graded Plates Based
11
ORIGINAL_ARTICLE
Free and Forced Vibration Analysis of Functionally Graded Material Cylinders by a Mesh-Free Method
In this paper, free and forced vibration analysis of functionally graded material cylinders was carried out by mesh-free and finite element method. In this analysis, MLS shape functions are used for approximation of displacement field in the weak form of motion equation and essential boundary conditions are imposed by transformation method. Resulted set of differential equations are solved using central difference approximation. Mechanical properties of cylinders were assumed to be variable in the radial direction as a function of volume fraction. Effects of geometrical dimensions of the cylinders, exponent of material volume fraction and the effect of loading type were investigated by the proposed model and FEM. Results obtained by this analysis were compared with the analytical solutions and the results of finite element analysis, and a very good agreement was seen between them.
http://jsme.iaukhsh.ac.ir/article_515496_f0ec6f7ee7718438d24cdcfcb2707e4e.pdf
2009-06-22
69
77
FGM
Mesh-Free
MLS
Vibration
Transformation function
R.
Moradi-Dastjerdi
1
M.Sc., Young Researchers Club, Islamic Azad University, Khomeinishahr Branch
AUTHOR
M.
Foroutan
foroutan@razi.ac.ir
2
Assistant Professor, Mechanical Engineering Department, Razi University, Kermanshah
LEAD_AUTHOR
A. A.
Pour Asghar
3
M.Sc. Student, Mechanical Engineering Department, Razi University, Kermanshah
AUTHOR
[1] Koizumi M. , The concept of FGM. Ceram., Trans. Function Graded Material, 34, 1993, pp. 3–10.
1
[2] Kashtalyan M., Three-dimensional elasticity solution for bending of functionally graded rectangular plates, Eur. J. Mech. A–Solid, 23, 2004, pp. 853–864.
2
[3] Loy C.T., Lam K.Y., Reddy J.N., Vibration of functionally graded cylindrical shells, Int. J. Mech. Sci., 41, 1999, pp. 309–324.
3
[4] Pradhan S.C., Loy C.T., Reddy J.N., Vibration characteristics of functionally graded cylindrical shells under various boundary conditions, Appl. Acoust., 61, 2000, pp. 111–129.
4
[5] Kadoli R., Ganesan K., Buckling and free vibration analysis of functionally graded cylindrical shells subjected to a temperature-speciefied boundary condition, J. Sound. Vib., 289, 2006, pp. 450–480.
5
[6] Haddadpour H., Mahmoudkhani S., Navazi H.M., Free vibration analysis of functionally graded cylindrical shells including thermal effects, Thin-Walled Structures., 45, 2007, pp. 591-599.
6
[7] Ansari R., Darvizeh M., Prediction of dynamic behaviour of FGM shells under arbitrary boundary conditions, Compos. Struct., 85, 2008, pp. 284–292.
7
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ORIGINAL_ARTICLE
Numerical Determination of the Forming Limit Diagram for 304 Stainless Steel Based on Phase Change in Deep Drawing Process
Up to now a large number of models have been developed to measure or predict the damage in equipments. Some of these models have been implemented in ABAQUS software. To implement damage parameters in the software, it is necessary to perform complex and expensive practical tests. One of these damage models is Forming Limit Diagram (FLD).The purpose of this research is deriving required parameters for modeling damage by numerical method and using of software. To study and compare of the accuracy of this method, these parameters have been derived with experimental method. FLD parameters for metastable austenitic stainless steel 304 have been extracted from Erichsen test and then phase change from austenite to martensite during deep drawing have been modeled with CLEMEX and SIGMAPLOT software. By defining changes of physical and mechanical properties of elastic-plastic material, the obtained results are transmitted to ABAQUS via developing a VUMAT subroutine in FORTRAN. Then Erichsen test has been simulated in ABAQUS and aforementioned subroutine was used to define changes of properties in simulation. Critical points susceptible for necking in all test cups are determined and numerical FLD was drawn based on principal strains in these points. Finally, the results of this method and practical tests were compared
http://jsme.iaukhsh.ac.ir/article_515497_fdc21a0a7aa7df2ac0cb655c95993b81.pdf
2009-06-22
79
89
Damage mechanics
FLD
Erichsen test
Change of phase
Deep drawing process
Necking
FEM simulation
M.
Nasr
1
M.Sc. Student, Islamic Azad university, Najafabad Branch
AUTHOR
M.
Moradi
moradi@cc.iut.ac.ir
2
Assistant Professor, Mechanical Engineering Department, Isfahan University of Technology
LEAD_AUTHOR
F.
Haji Abotalebi
3
Assistant Professor, Mechanical Engineering Department, Islamic Azad university, Khomeinishahr Branch
AUTHOR
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