ORIGINAL_ARTICLE
Study of the Effects of Various Boundary Conditions on the Acoustical Treatments of Double-Panel Structures Lined with Poroelatic Materials
In this paper, the acoustical treatment of double-panel structures lined with poroelatic materials is predicted using analytical method in order to study the effective usage of the various boundary conditions of porous layer and to identify the effective parameters on the transmission loss of the multilayer systems. Therefore, inertia and viscous coupling along with thermal and elastic coupling should be considered in transfer stress dynamic and stress-strain relationships for an elastic porous material based on Biot theory. Then, the governing equations of the wave propagation in an elastic porous material are briefly considered and the general forms for the stresses and displacements within the porous material are given. Applying various boundary conditions and solving these equations with Matlab code simultaneously, the transmission loss of these structures is calculated. The results from the analytical method are compared with the SEA madel and the experimental data with excellent agreement is observed. Finally, the influence of effective parameters of this structure with various boundary conditions on the transmission loss of the multilayer systems is studied. The results have been shown that the transmission loss of double-panel structures lined with a layer of porous material can depend critically on the method of mounting the porous layer to the facing panel.
http://jsme.iaukhsh.ac.ir/article_515366_397aa9fc5b508a26cf4a95e8977b9689.pdf
2010-12-22
1
12
Double-panel structures
Poroelastic layer
Transmission loss
Boundary Condition
Statistical Energy Analysis(SEA)
M.H.
Shojaeefard
1
Professor, Iran University of Science and Technology.
AUTHOR
R.
Talebi
rtalebi@iust.ac.ir
2
Assistant Professor, Iran University of Science and Technology
LEAD_AUTHOR
R.
Ahmadi
3
PhD Student, Iran University of Science and Technology
AUTHOR
M.
Amirpour Molla
4
M.Sc. Student, Iran University of Science and Technology
AUTHOR
[1] Bolton J. S., Shiau N. M. and Kang Y. J., , Sound Transmission Through Multi-Panel Structures Lined with Elastic porous Materials, J. of Sound and Vibration, 191(3-4), 1996, pp. 317-347.
1
[2] Fahy F. J., , Foundation of Engineering Acoustics, Academic Press, 2001.
2
[3] Rayleigh J. W. S., The Theory of Sound, Vol. II, Art. 351, Dover Publication, New York, 1945.
3
[4] Zwikker C. and Kosten C. W., Sound Absorbing Materials, Elsevier Press, Amsterdam, 1949.
4
[5] Biot M. A., , Theory of Propagation of Elastic Waves in a Fluid-Structural porous Solid I, Low Frequency Range, J. of Acoustical Society of America, Vol. 28, No. 2, 1956, pp. 168-178.
5
[6] Biot M. A., Theory of Propagation of Elastic Waves in a Fluid-Structural porous Solid II, High Frequency Range, J. of Acoustical Society of America, Vol. 28, No. 2, 1956, pp. 179-191.
6
[7] Atalla N., Panneton R. and Deberdue P., A Mixed Displacement-Pressure Formulation for Poroelastic Materials, J. of Acoustical Society of America, Vol. 104, No. 3, 1998, pp. 1444-1452.
7
[8] Segard F. C., Atalla N. and Nicolas J., A Numerical Model for the Low Frequency Diffuse Field Sound Transmission Loss of Double-wall Sound Barriers with Elastic Porous Linings, J. of Acoustical Society of America, Vol. 108, No. 6, 2000, pp. 2865-2872.
8
[9] Bolton J. S. and Green E. R., Normal incidence sound transmission through double-panel systems lined with relatively stiff, reticulated polyurethane foam, Applied Acoustics. 39, 1993, pp. 23–51.
9
[10] Bolton J. S. and Kang Y. J., Elastic porous materials for sound absorption and transmission control, Proceedings of SAE Noise and Vibration Conference, 971878, 1997, pp. 77-91.
10
[11] Bolton J. S., Heng-Yi Lai, katragadda S. and Alexander J. H., Layered Fibrous Treatment for a Sound Absorption and Transmission Control, SAE 971878, 1997, pp. 2576-2590.
11
[12] Tadeu A., Antonio J., Mateus D., Sound insulation provided by single and double panel walls, a comparison of analytical solutions versus experimental results, Applied Acoustics, 65, 2004, pp. 15-29.
12
[13] Tanneau O., Casimir J. B. and Lamary P., Optimization of multilayered panels with poroelastic components for an acoustical transmission objective, J. of Acoustical Society of America, 120 (3), 2006, pp. 1227-1238.
13
[14] Ghosh A.K., Williams A.D., Zucker J.M., Mathews J.L., Spinhirne N. , An Experimental Investigation into the Acoustic Characteristics of Fluid-filled Porous Structures-A Simplified Model of the Human Skull Cancellous Structure, Experimental Mechanics, 48, 2008, pp. 139-152.
14
[15] Xin, F.X., Lu, T.J., Transmission loss of orthogonally rib-stiffened double-panel structures with cavity absorption, J. of Acoustical Society of America, 129, 2011, pp. 1919-1934.
15
[16] Daneshjou K., Ramezani H., Talebitooti R., Wave transmission through laminated composite double-walled cylindrical shell lined with porous materials, Applied Mathematics and Mechanics, 32(6), 2011, pp. 701–718.
16
[17] Allard J.F., Propagation of sound in porous media: modeling sound absorbing materials, Elsevier Science Publishers LTD., 1993.
17
[18] Kang Y. J. & Bolton J. S., A finite element model for sound transmission through foam-lined double-panel structures, J. of Acoustical Society of America, 99, 1996, pp. 2755–2765.
18
[19] Lee J.H. and Kim J., Simplified method to solve sound transmission through structures lined with porous material, J. of Acoustical Society of America, 110, 2001, pp. 2282-2294.
19
[20] A. D. Pierce, 1981, Acoustics, New York: McGraw Hill.
20
[21] Mulholland K. A., Parbrook H. D. and Cummings A., The Transmission Loss of Double Panels, J. Sound and Vib., 6, 1967, pp. 324–334.
21
[22] AutoSEA2 User's Guide, ESI Group., July 2004.
22
ORIGINAL_ARTICLE
A Survey on Buckling and Vibrations of a Viscoelastic Beam under Distributed Lateral and Axial Loads
In this paper, based on Kelvin and Linear Standard Solid models, dynamic response and the buckling load of a viscoelastic beam under lateral and axial loads have been determined. The governing equations have been extracted using Euler and Timoshenko theories and their analytical solutions have been obtained by using the eigenfunctions expansion method. Buckling load have been calculated by using the Euler and Timoshenko beam theories based on Kelvin and standard models. The results have been compared with the elastic case. The results show that the simulation of a viscoelastic beam with an elastic case, is not a reasonable approximation for moderately high damping. Also, the damping parameter has not been appeared explicitly in the buckling load determination, even though the buckling load of a viscoelastic beam is 50% more than an elastic beam.
http://jsme.iaukhsh.ac.ir/article_515367_2d78f016ad8a9f743635bcd1a22f90c7.pdf
2010-12-22
13
21
Viscoelastic beam vibration
Viscoelastic beam buckling
Eigenfunctions expansion method
Axial and lateral loadings
H.R.
Eipakchi
eipakchi @ shahroodut.ac.ir
1
Assistant Professor, Mechanical Engineering Faculty, Shahrood University of Technology
LEAD_AUTHOR
H.
Seddighi
2
M.Sc. Student, Mechanical Engineering Faculty, Shahrood University of Technology
AUTHOR
[1] Timoshenko S.P, Gere J.M, Theory of Elastic
1
Stability, Mc Graw-Hill Company, 1985.
2
[2] Mirsky I .,Hermann G., Axially Symmetric
3
Motion of Thick Cylindrical Shells, Journal of
4
Applied Mechanics, 1958, 25, pp. 99-152.
5
[3] Baber T.T., Maddox R. A., Orozco C.E., A
6
finite element model for harmonically excited
7
viscoelastic sandwich beams, Computers &
8
Structures, 66 (1), 1998, pp. 105-113.
9
[4] Branca F., Guillermo J. , Nonlinear viscoelastic
10
analysis of thin-walled beams in composite
11
material, Thin-Walled Structures , 41, 2003, pp.
12
[5] Ganesan N., Pradeep V., Buckling and vibration
13
of sandwich beam with viscoelastic core under
14
thermal environments, Journal of Sound and
15
Vibration, 286 (4-5), 2005, pp. 1067-1074.
16
[6] Kocatürk T., Şimşek M., Dynamic analysis of
17
eccentrically prestressed viscoelastic
18
Timoshenko beam under a moving harmonic
19
load, Computers & Structures, 84(31-32) ,
20
2006, pp. 2113-2127.
21
[7] Salehi M., Ansari F., Viscoelastic buckling of
22
Euler-Bernoulli and Timoshenko beams under
23
time variant general loading condition, Iranian
24
Polymer Journal ,15(3), 2006, pp.183-193.
25
[8] Seong M., Yoon H., Vibration and dynamic
26
buckling of shear beam-columns on elastic
27
foundation under moving harmonic loads,
28
International Journal of Solids and Structures,
29
43, 2006, pp. 393–412.
30
[9] Mahmoudi S.N, Khadem S., Kokabi M., Nonlinear
31
free vibrations of Kelvin–Voigt viscoelastic
32
beams, International Journal of
33
Mechanical Sciences, 49, 2007, pp. 722–732.
34
[10] Ganesan S.N., Sethuraman R., Buckling and
35
free vibration analysis of magnetic constrained
36
layer damping (MCLD) beam, Finite Elements
37
in Analysis and Design, 45, 2009, pp. 156-162.
38
[11] Kiani K., Nikkhoo A., Mehri B., Parametric
39
analyses of multispan viscoelastic shear
40
deformable beams under excitation of a moving
41
mass, Journal of Vibration and Acoustics, 131,
42
2009, pp. 1-12.
43
[12] Mofid M. , Tehranchi A., Ostadhossein A., On
44
the viscoelastic beam subjected to moving mass,
45
Advances in Engineering Software, 41(2), 2010,
46
pp. 240-247.
47
[13] Arvin H., Sadighi M., Ohadi A.R., A
48
numerical study of free and forced vibration of
49
composite sandwich beam with viscoelastic
50
core, Composite Structures, 92(4), 2010, pp.
51
[14] Hagadon P. , Dasgupa A. ,Vibration and
52
Waves in Continuous Mechanical System, John
53
Wiley Company, 2007.
54
[15] Drozdov A., Viscoelastic Structures, Academic
55
ORIGINAL_ARTICLE
Optimum Die Design in Drawing of Square Section Rod from Round Bar
Drawing of square section rod from round bar can be done with two die shapes. In the first die shape, deformation starts from corners of the square and in second die shape, deformation starts from sides of square. This article has compared the drawing force for both die shapes and as a result optimum die shape was determined. Due to complexity of metal flow inside the die, analyzing of actual process was difficult and upper bound approach has applied based on equivalent axisymmetric curved die. In equivalent process, in each position on the die axis, perpendicular cross sections on both actual and the equivalent die have the same area. By determining the profile of the equivalent curved die, a velocity field inside the die was presented. Then, internal, shearing and frictional powers were calculated and relative mean draw stress was estimated by equating the summation of these powers with required external power. As a final result, the die shape which required less force was introduced as optimum one
http://jsme.iaukhsh.ac.ir/article_515375_c4d51726f644b12238bb782997cd5ad3.pdf
2010-12-22
31
38
drawing
Square section rod
Upper bound
Optimum die
H.
Haghighat
hhaghighat@razi.ac.i
1
Assistant Professor, Department of Mechanical Engineering, Razi University of Kermanshah
LEAD_AUTHOR
S.B.
Allahveysi
2
M.Sc. Mechanical Engineering Gratuated Student, Technical and Engineering Faculty, Razi University of Kermanshah
AUTHOR
[1] Wistreich, J.G., Investigation of the Mechanics of Wire Drawing, Proc. Inst. Mech. Engrs., (London), Vol. l69, 1955, pp. 654-665.
1
[2] Avitzur, B., Metal Forming Processes and Analysis, McGraw-Hill, New York, 1968.
2
[3] Juneja, B.L., Prakash, R., An analysis for drawing and extrusion of polygonal section, Int. J. Mach. Tool. Des. Res., Vol. 15, 1975, pp. 1-30.
3
[4] Basily, B.B., Sansome, D.H., Some theoretical considerations for the direct drawing of section rod from round bar, Int. J. Mech. Sci., Vol. 18, 1976, pp. 201–208.
4
[5] Boer, C.R., Webster, W.D., Direct upper-bound solution and finite element approach to round-to square drawing, J. Eng. Ind., Vol. 107, 1985, pp. 254-260.
5
[6] Gunasekera J.S., Hoshino S., Analysis of extrusion or drawing of polygonal sections through straightly converging dies, J. Eng. Ind. Trans, ASME, Vol. 104, 1982, pp. 38–45.
6
[7] Gordon, W.A., Van Tyne C.J., Moon Y.H., Axisymmetric extrusion through adaptable dies-Part 1: Flexible velocity fields and power terms, Int. J. Mech. Sci. ., Vol. 49, 2007, pp. 86–95.
7
[8] Gordon, W.A., Van Tyne C.J., Moon Y.H., Axisymmetric extrusion through adaptable dies. part 2. comparison of velocity fields, Int. J. Mech. Sci., Vol. 49, 2007, pp. 96–103.
8
[9] Gordon, W.A., Van Tyne C.J., Moon Y.H., Axisymmetric extrusion through adaptable dies-Part 3: Minimum pressure streamlined die shapes, Int. J. Mech. Sci , ., Vol. 49, 2007,pp. 104-115.
9
[10] S. Norasethasopon, Influence of process parameters on shape quality and area fraction in round-to-hexagonal composite wire drawing, Journal of materials processing technology, Vol. 203, 2008, pp. 137–146.
10
[11] Haghighat H., Allahveysi S.B., AkhavanA., Estimation of Drawing Force in Drawing of Twisted Square Section Rod from Round Bar, International Journal of Engineering & Applied Sciences,Vol. 3, 2011, pp.1-14.
11
[12] Prager, W., Hodge, P.G., Theory of perfectly plastic solids, John Wiley and Sons Inc. New York, 1951.
12
ORIGINAL_ARTICLE
Using the Ultrasonic Nondestructive Methods for Prediction of Mechanical Properties of AISI 4140 Alloy Steel
Achieving the mechanical properties of steels after various manufacturing and heat treatment processes is significant and essential. In production lines, after producing the specific and standard samples, mechanical properties have been measured by destructive processes which cause waste of cost and time. In addition, destructive techniques cannot detect the miniscule changes made in mechanical properties of steel during heat treatment processes. In this paper, the ultrasonic nondestructive method is used for accurate measuring the elastic properties of AISI 4140 steel samples which are heat treated at different levels. Each sample has its specific microstructure and hardness due to the heat treatment process it has gone through. The elastic properties of each sample are obtained by measuring the velocities of longitudinal and shear waves in each sample. On the other hand, for detecting the error resources and evaluation of precision of measuring method, uncertainty analysis is performed. A good agreement is noted between results obtained from ultrasonic measurements and available information in reference tables and it was shown that the ultrasonic technique can measure the elastic properties of AISI 4140 samples with high accuracy. In sum, achieved results show that the maximum value of mechanical properties belongs to the microstructure with higher hardness and with decreasing the hardness these properties, also, decline.
http://jsme.iaukhsh.ac.ir/article_515368_26b0ec00e98b3b4ef1bed962fbaa88b5.pdf
2010-12-22
23
30
Mechanical properties of steel
Ultrasonic nondestructive method
AISI 4140
Uncertainty analysis
M.
Hamidnia
1
M.Sc. Student, Factually of Mechanical Engineering, K. N. Toosi University of Technology
AUTHOR
F.
Honarvar
honarvar@kntu.ac.ir
2
Associated Professor, Factually of Mechanical Engineering, K. N. Toosi University of Technology
LEAD_AUTHOR
[1] الوک نایار، مترجمین حسن غیاثوند، حجت اله عالی، محمدرضا رهگذر راهنمای جامع فولاد، تهران: جهان جامجم، 1384.
1
[2] Vasudevan M., Palanichamy P., Characterization of Microstructural Changes During Annealing of Cold Worked Austenitic Stainless Steel Using Ultrasonic Velocity Measurements and Correlation with Mechanical Properties, Jmepeg, 11, 2002, pp. 169-179. ASTM Standard,
2
[3] Designation: E 797 – 95, Standard Practice for Measuring Thickness by Manual Ultrasonic Pulse-Echo Contact Method.
3
[4] Rajendran V., Palanivelu N., Chaudhuri B. K., A device for the measurement of ultrasonic velocity and attenuation in solid materials under different thermal conditions, Measurement, 38, 2005, pp. 248–25.
4
[5] Murthy G. V. S., Sridhar G., Kumar A., Jayakumar T., Characterization of intermetallic precipitates in a Nimonic alloy by ultrasonic velocity measurements, MaterialsCharacterization,
5
60, 2009, pp. 234-239.
6
[6] Carreon H., Ruiz A., Medina A., Barrera G., Zarate J., Characterization of the alumina–zirconia ceramic system by ultrasonic velocity measurements, Materials Characterization, 60, 2009, pp. 875-881.
7
[7] Zawrah M. F., El-Gazery M., Mechanical properties of SiC ceramics by ultrasonic nondestructive technique and its bioactivity, Materials Chemistry and Physics, 106, 2007, pp. 330–337.
8
[8] Moro A., Farina C., Rossi F., Measurement of ultrasonic wave velocity in steel for various structures and degrees of cold-working, NDT International, August 1980.
9
[9] Gur C. H., Tuncer B. O., Characterization of microstructural phases of steels by sound velocity measurement, Materials Characterization, 55, 2005, pp.160– 166.
10
[10] ASTM Standard, Designation:E 214, Standard Practice for Immersed Ultrasonic Examination by the Reflection Method Using Pulsed Longitudinal Waves.
11
[11] ASTM Standard, Designation: E 1001, Standard Practice for Detection and Evaluation of Discontinuities by the Immersed Pulse-Echo Ultrasonic Method Using Longitudinal Waves.
12
[12] رنجبر، ابوالفضل، حاجیزاده، عبدالحسین، تئوری خطاها، تهران، مقدس، 1388.
13
[13] دشتی زاده، مرتضی، پایاننامه کارشناسی ارشد، دانشگاه صنعتی خواجه نصیرالدین طوسی، 1385.
14
[14] قربانی سالخورد، محسن، پایان نامه کارشناسی ارشد، دانشگاه صنعتی خواجه نصیر الدین طوسی، 1383.
15
[15] Colman H. W., Steel W. G., Experimental and Uncerainty Analysis forEngineers, 2th Edition, John wiley and Sons Inc, 1999.
16
[16] ASTM Standard, Designation: E 797 – 95, Standard Practice for Measuring Thickness by Manual Ultrasonic Pulse-Echo Contact Method
17
ORIGINAL_ARTICLE
Surface Effect on Nonlinear Free Vibration Analysis of Nanotubes
In this work,The free nonlinear vibrations of nanotubes using the Euler-Bernoulli beam theory along with the von Kármán geometric nonlinearity in presence of surface effects has been investigated. Natural frequencies of a simply-supported nanotube in terms of the Jacobi elliptic functions are obtained by using the free vibration modes of the corresponding linear problem. The numerical results describe the imperative influence of surface effect, mode number, vibration amplitude, and the length and thickness of the nanotubes on the vibrational characteristics of the nanotubes. In addition the influence of surface effects on the system phase trajectory is considered. Finally, it is observed that the surface effects diminish by increasing in the dimension of nanotubes. The present study may be used to improve the design of different types of micro-nano sensors.
http://jsme.iaukhsh.ac.ir/article_515376_debab156d558a6ae14b512d1babcb38a.pdf
2010-12-22
39
46
Nonlinear vibration
Nanotubes
Surface effect
Jafar
Eskandari Jam
1
Associated Professor, Composite Material and Technology Center, Tehran, Iran
AUTHOR
Yaser
Mirzaei
mirzaei @damavandiau.ac.ir
2
Professor, Department of mechanical engineering, Damavand branch, Islamic Azad University, Damavand, Iran
LEAD_AUTHOR
Behnam
Gheshlaghi
3
- Lecturer, Department of mechanical engineering, Damavand branch, Islamic Azad University, Damavand, Iran
AUTHOR
[1] Fennimore A.M., Yuzvinsky T.D., Han W.Q., Fuhrer M.S., Cumings J., Zettl A., Rotational actuators based on carbon nanotubes, Nature, 424, 2003, pp. 408-410.
1
[2] Williams P.A., Papadakis S.J., Patel A.M., Falvo M.R., Washburn S., Superfine R., Fabrication of nanometer-scale mechanical devices incorporating individual multiwalled carbon nanotubes as torsional springs, Applied Physics Letters, 82, 2003, pp. 805-807.
2
[3] Papadakis S.J., Hall A.R., Williams P.A., Vicci L., Falvo M.R., Superfine R., Washburn S., Resonant oscillators with carbon-nanotube torsion springs, Physics Review Letters, 93, 2004, pp. 1461011, 1461014.
3
[4] Williams P.A., Papadakis S.J., Patel A.M., Falvo M.R., Washburn S., Superfine R, Torsional response and stiffening of individual multiwalled carbon nanotubes, Physics Review Letters, 89, 2002, pp. 2555021-2555025.
4
[5] Lagowski J., Gatos H.C., Sproles Jr E.S., Surface stress and the normal mode of vibration of thin crystals: GaAs, Applied Physics Letters, 26, 1975, pp. 493-495.
5
[6] Sader J. E., Surface stress induced deflections of cantilever plates with applications to the atomic force microscope: rectangular plates, Journal of Applied Physics, 89, 2001, pp. 2911-2921.
6
[7] Lee J.H., Kim T. S., Yoon K. H., Effect of mass and stress on resonant frequency shift of functionalized Pb(Zr0.52Ti0.48)O3 thin film microcantilever for the detection of C-reactiveprotein, Applied Physic Letters, 84, 2004, pp. 3187-3189.
7
[8] He J., Lilley C.M., Surface Effect on the Elastic Behavior of Static Bending Nanowires, Nano Letters, 2008, pp. 1798–1802.
8
[9] Wang G.F, Feng X.Q., Effects of surface elasticity and residual surface tension on the natural frequency of microbeams, Applied Physic Letters, 90, 2007, pp. 2319041-2319044.
9
[10] Abbasion S., Rafsanjani A., Avazmohammadi R., Farshidianfar A., Free vibration of microscaled Timoshenko beams, Applied Physic Letters, 95, 2009, pp. 1431221-1431224.
10
[11] Zhang Y.Y., Wang C.M., Tan V.B.C., Assessment of Timoshenko beam models for vibrational behaviour of single-walled carbon nanotubes using molecular dynamics, Advances in Applied Mathematics and Mechanics, 1, 2009, pp. 89-106.
11
[12] Fu Y. M., Hong J. W., Wang X. Q., Analysis of nonlinear vibration for embedded carbon nanotubes, Journal of Sound and Vibration, 96, 2006, pp. 746-756.
12
[13] Gibbs J. W., The Scientific Papers of J. Willard Gibbs, Vol. 1: Thermodynamics: Longmans and Green, New York, 1906.
13
[14] Cammarata R.C., Surface and interface stresses effects in thin films, Prog. Surf. Sci, 46, 1994, pp. 1–38 .
14
[15] Gurtin ME, Murdoch AI, A continuum theory of elastic material surfaces, Arch Rat Mech Anal, 57, 1975, pp. 291-323.
15
[16] Gurtin ME, Struthers A., Multiphase thermomechanics with interfacial structure, Arch Rat Mech Anal,112, 1990, PP. 97-160.
16
[17] Wang G.F., Feng X.Q., Effects of surface elasticity and residual surface tension on the natural frequency of microbeams, Applied Physics Letters, 90, 2007, pp. 231904.
17
[18] Ke L.L., Yang J., Kitipornchai S., An analytical study on the nonlinear vibration of functionally graded beams, Meccanica, 45, 2009, pp. 743-752.
18
[19] Byrd P.F., Friedman M.D., Handbook of Elliptic Integrals for Engineers and Scientists, Springer, Berlin, 1991.
19
[20] Miller R.E., Shenoy V.B., Size-dependent elastic properties of nanosized structural elements, Nanotechnology, 11, 2000, pp. 139-147.
20
[21] Shenoy V.B., Atomistic calculations of elastic properties of metallic fcc crystal surfaces, Phys. Rev. B 71, 2005, pp. 0941041-09410411.
21
ORIGINAL_ARTICLE
Analysis of Free Vibration Sector Plate Based on Elastic Medium by using New Version of Differential Quadrature Method
The new version of differential quadrature (DQ) method is extended to analyze the free vibration of thin sector orthotropic plates on the Pasternak elastic foundation with various sector angles and elastic parameters. Detailed formulations are given. Comparisons are made with existing analytical and/or numerical data. Numerical results indicate that convergence can be achieved with increasing in number of grid points. The accurate results could be obtained with 9x9 or even higher grid. It is found that the results are influenced by grid spacing and for obtaining the accurate and reliable result non-uniform grid should be used.
http://jsme.iaukhsh.ac.ir/article_515377_d0741a9f743b5ab066d455493fa4ee9a.pdf
2010-12-22
47
56
Differential quadrature method
Vibration
Circular Sector plate
Polar Orthotropic
Pasternak foundation
M.
Mohammadi
1
M.Sc. Student, Isfahan University of Technology
AUTHOR
M.
Ghayour
ghayour@cc.iut.ac.ir
2
Associate Professor, Isfahan University of Technology
LEAD_AUTHOR
A.
Farajpour
3
M.Sc. Student, Isfahan University of Technology
AUTHOR
[1] Chakraverty S., Vibration of plates, CRC press, Taylor & Francis Group, 2009.
1
[2] Rudolph S., Ing P.E., Theories and Applications of Plate Analysis, John Wiley & Sons 2nd edited, New Jersey, 2004.
2
[3] Rao S., Vibration of continuous systems, John Wiley & Sons, 2007.
3
[4] Liew, K.M., Han, J.B., Xiao, Z.M., Du, H., Differential quadrature method for mindlin plates on Winkler foundations, International Journal of Mech. Sci., Vol. 38, 1996, pp.405–421.
4
[5] Zhou D., Lo S.H., Au F.T.K., Cheung Y.K., Three-dimensional free vibration of thick circular plates on Pasternak foundation, Journal of Sound and Vibration, Vol. 292, 2006, pp. 726 – 741.
5
[6] Hosseini-Hashemi Sh., Rokni-Damavandi-Taher H., Omidi M., 3-D free vibration analysis of annular plates on Pasternak elastic foundation via p–Ritz method, Journal of Sound and Vibration, Vol. 311, 2008, pp.1114–1140.
6
[7] Qin, Q.H., Hybrid–Treffiz finite element approach for plate bending on an elastic foundation, Appl. Math. ,Vol.18, 1994, pp.334-339.
7
[8] Qin, Q.H., Hybrid–Treffiz finite element method for Reissner plates on an elastic foundation, Comput. Methods Appl. Mech. Eng., Vol. 122, 1995, pp.379–392.
8
[9] Gupta U.S., Ansari A.H., Sharma S., Buckling and vibration of polar orthotropic circular plate resting on Winkler foundation, Journal of Sound and Vibration, Vol. 297, 2006, pp.457 – 476.
9
[10] Huang C.S., Leissa A.W., McGee O.G., Exact analytical solutions for the vibrations of sectorial plates with simply supported Radial edges, J. Appl. Mech. ,Vol. 60, 1993, pp.478–483.
10
[11] Huang C.S., Leissa A.W., McGee O.G., Exact analytical solutions for free vibrations of thick sectorial plates with simply Supported radial edges, Int. J. Solids Struct., Vol. 31, 1994, pp.1609–1631.
11
[12] Shu C., Richards B. E., Application of generalized differential quadrature to solve two-dimensional incompressible Navier-stokes equations, Int. J. Number. Methods Fluids ,Vol. 15 1992, pp.791-798.
12
[13] Shu C., Differential quadrature and its application in engineering, Springer-Verlag, London 2000.
13
[14] Liu F.L., Liew K.M., Free vibration analysis of Mindlin sector plates numerical solutions by diffrential quadrature method, Comput Methods, 1999.
14
[15] Wu T.Y., Liu G.R., The generalized differential quadrature rule for initial value differential equations, J. Sound Vib., Vol. 233, 2000, pp.195-223.
15
[16] Wu T.Y., Liu G.R., The generalized differential quadrature rule for fourth-order differential equations, Int. J. Numer. Methods Engrg. , Vol. 50, 2001, pp.1907–1929.
16
[17] Wu T.Y., Wang Y.Y., Liu G.R., Free vibration analysis of circular plates using generalized differential quadrature rule, Comput. Methods Appl. Mech. Engrg., Vol. 191, 2002, pp.5365–5380.
17
[18] Wu T.Y., Liu G.R., Free vibration analysis of circular plates with variable thickness by the generalized differential quadrature rule, Int. J. Solids Struct., Vol. 38, 2001, pp.7967–7980.
18
[19] Liew K.M., Liu F.L., Differential quadrature method for vibration analysis of shear deformable annular sector plates, J. Sound Vib. Vol. 230, 2000, pp.335–356.
19
[20] Li X., Zhong H., He Y.Free vibration analysis of sectorial plates by the triangular differential quadrature method, J. Qinhua, 2003.
20
[21] Wang X., Wang Y., Free vibration analysis of sectorial plates by the new version of differential quadrature method, J. Computer Methods in Applied Mechanics and Engineering, 2004.
21
ORIGINAL_ARTICLE
Optimization of Reduction Settings and Inter-stand Tensions for Tandem Cold Mills using Genetic Algorithm
Cold rolling process is a complicated process which can be optimized by changing in variables and settings. This paper presents a set-up optimization system developed to calculate reductions and inter-stand tensions for each stand of a five stand tandem cold mill. The main objective in this optimization is minimization of power consumption. First, by using the analytical method, the equations of roll force and roll torque have been determined. The Genetic algorithm has been used to find out the optimum reduction setting and inter-stand tension which minimized the power consumption in five roll stands. The results have been compared with experimental data. Finally, the influence of effective parameters such as lubricants and strength of plates is studied. The results have been shown a similar pattern in reduction setting.
http://jsme.iaukhsh.ac.ir/article_515388_c3eab0f180f0c54387d9c54bcd029925.pdf
2010-12-22
57
67
Tandem cold rolling
Set-up optimization, Genetic algorithm, Lubricant, Power consumption
Farshid
Agha Davoudi
davoodi@iaukhsh.ac.ir
1
Lecturer, Islamic Azad University, Khomeinishar Branch
LEAD_AUTHOR
Hossien
Golestanian
golestanian@eng.sku.ac.ir
2
Associated Professor, Faculty of Engineering, University of Shahrekord University
AUTHOR
Navid
Negahbani
3
Lecturer, Islamic Azad university, Khomeinishar Branch, Ph.D. Student, Polytechnic of Milan
AUTHOR
[1] Von Karman Th., Beitrag zur Theorie des Walzvorganges (Contribution to the Theory of Rolling), Vortrlge der Dresdener, Tagung, Band 5, Heft 2, 1925.
1
[2] Ekelund S., The Analysis of Factors Influencing Rolling Pressure and Power Consumption in the Hot Rolling of Steel, 1927, vol. 111, p. 39.
2
[3] Orowan, E., 1943, The calculation of Roll Pressure in Hot and Cold Flat Rolling, Proceedings of the Institution of Mechanical Engineers, Vol. 150, pp. 140-167.
3
[4] Bland D.R., Ford H., The calculation of roll force and torque in cold strip rolling with tensions, Proceedings of the Institution of Mechanical Engineers, 1948.
4
[5] Hill R., The Mathematical Theory of Plasticity, Oxford University Press, London, 1950.
5
[6] Stone M. D., Rolling of Thin Strip, Parts I and II, Iron Steel Engr., February. 1953, pp. 61-74; December 1956, pp. 55-76.
6
[7] Venkata Reddy, N. , Suryanarayana, G., A set-up model for tandem cold rolling mills, J. Mater. of Proce. Technology, 116, 2001, pp. 269-277.
7
[8] Pires C.T.A., Ferreira H.C., Salesb R.M. , Set-up optimization for tandem cold mills: A case study, World Scientific, Brazil , 2005.
8
[9] Tieu A. K., Liu Y. J., Friction variation in the cold-rolling process, Tribol. Int., 37 ,2004, pp. 177–183.
9
[10]Ďurovský F., Zboray L., Ferková Z., Computation of Rolling Stand Parameters by Genetic Algorithm, Acta Polytechnica Hungarica, Vol. 5, No. 2, 2008.
10
[11] Haijun Ch., Xinyan H., Jingming Y., Optimization of schedule with multi-objective for tandem cold rolling mill based on IAGA, Mechanic Automation And Control Engineeing Conference (MACE), 2010.
11
[12] Hitchcock J.H., Elastic Deformation of Rolls during Cold Rolling, ASME Research Publication, p. 33, 1935,New York.
12
]12[ فتاحی ا.، پورسینا م. ، فرهت نیا ف. ، بهینه سازی توان مصرفی در خط نورد سرد پیوسته با الگوریتم ژنتیک، کنفرانس بینالمللی مهندسی مکانیک، بیرجند، 1390.
13
]13[ اشرفی م.، خادمی زاده ح.، موسوی ح.، بهینهسازی نورد نامتقارن به منظور بهینه کردن نیروی نورد و حذف انحنای ورق خروجی، چهاردهمین کنفرانس بینالمللی مهندسی مکانیک، دانشگاه صنعتی اصفهان، 1385.
14
[14] مشکسار، م ح، اصول مهندسی نورد، انتشارات دانشگاه شیراز، 1381 .
15
]15[ فتاحی ا.، بهینه سازی توان مصرفی در خط نورد سرد پیوسته با الگوریتم ژنتیک ، پایان نامه کارشناسی ارشد، دانشگاه آزاد اسلامی واحد خمینی شهر، 1390.
16
[16] Venkata Reddy, N., Suryanarayana, G., A
17
set-up model for tandem cold rolling mills,
18
J. Mater. of Proce. Technology, 116, 2001, pp. 269-277.
19
[17] Witton P. W., Ford H., Surface friction and lubrication in cold strip rolling, Proc. of Imperial college of London, 1954.
20
ORIGINAL_ARTICLE
Evaluation of Tool Performance With Nanocrystalline Multilayer Coatings on the Machinability of Superalloy Inconel 718
In this paper, the performance of the cutting tool with nanocrystalline multilayer coatings (TiN+TiAlN) for machining of superalloy Inconel 718 in the dry and wet conditions was studied. The multi layer TiN and TiAlN with nanocrystalline structure was applied by physical vapor deposition technique (arc evaporation) on the WC-Co inserts. The results of the ball on disc wear test and the machining of superalloy Inconel 718 in wet and dry conditions indicated that the nanocrystalline coatings could produce better performance of tools in turning. Abrasion and adhesive wear resistance improved by nanocrystalline and modified Aluminum composition in TiAlN coating as well as toughness and thermal stability.
http://jsme.iaukhsh.ac.ir/article_515389_6d8e3a8e061e434b6627b9c5f030006d.pdf
2010-12-22
69
75
Dry and wet machining
Superalloy Inconel718
Nanocrystalline multilayer coatings
Rasool
Mokhtari Homami
1
M.Sc., Department of Mechanical Engineering, Isfahan University of Technology
AUTHOR
Behrooz
Movahedi
b.movahedi@ast.ui.ac.ir
2
Assistant Professor, Department of Nanotechnology Engineering, Faculty of Advanced Sciences and Technology, University of Isfahan.
LEAD_AUTHOR
Iraj
Lirabi
3
Ph.D. Student, Department of Mechanical Engineering, University of Birjand
AUTHOR
Mehdi
Bazargan
4
Lecturer, Islamic Azad University, Khomeinishahr Branch
AUTHOR
[1] Wang Z.M., Titanium alloys and their machinability with coated
1
carbide inserts, Ph.D Thesis, South Bank University, London, 1997.
2
[2] Thakur D.G., Ramamoorthy B., Vijayaraghavan L., Study on the machinability characteristics of superalloy Inconel 718 during high speed turning, Materials & Design, Vol. 30, Issue 5, May 2009, pp. 1718-1725.
3
[3] Khrais S.K., Lin Y.J., Wear mechanisms and tool performance of TiAlN PVD coated inserts during machining of AISI 1440 steel, Wear,Vol. 262, Issues 1–2, 4 January 2007, pp. 64-69.
4
[4] Ezugwu E.O., Wang Z.M., Performance of PVD and CVD coated tools when machining nickel-based Inconel 718 alloy, in: N. Narutaki, et al. (Eds.), Progress of Cutting and Grinding, Vol. 111, 1996, pp. 102–107.
5
[5] Liao Y.S., Lin H.M., Wang J.H., Behaviors of end milling Inconel 718 superalloy by cemented carbide tools, Journal of Materials Processing Technology, Vol. 201, Issues 1–3, 26 May 2008, pp. 460-465.
6
[6] Kamata Y., Obikawa T., High speed MQL finish-turning of Inconel 718 with defferent coated tools, Journal of Materials Processing Technologhy, Vol. 192-193, October 2007, pp. 281-286.
7
[7] Fox-Rabinovich G.S., Beake B.D., Endrion J.L., Veldhuis S.C., Parkinson R., Shuster L.S., Migranov M.S., Effect of mechanical properties measured at room and elevated temperatures on the wear resistance of cutting tools with TiAlN and AlCrN coatings, Surface and Coatings Technology, Vol. 200, Issues 20-21, 22 May 2006, pp. 5738-5742.
8
[8] Devillez A, Schneider F., Dominiak S., Dudzinski D., Larrouquere D., Cutting forces and wear in dry machining of Inconel 718 with coated carbide tools, Wear, Vol. 262, Issues 7-8, 15 March 2007, pp. 931-942.
9
[9] Ezugwu E.O., Key improvements in the machining of difficult-to-cut aerospace superalloys, International Journal of Machine Tools and Manufacture, Vol. 45 Issues 12-13, October 2005, pp. 1353-1367.
10
[10] Biksa A., Yamamoto K., Dosbaeva G., Veldhuis S.C., Fox-Rabinovich G.S., Elfizy A., Wagg T., Shuster L.S., Wear behavior of adaptive nano-multilayered AlTiN/MexN PVD coatings during machining of aerospace alloys, Tribology Interamtional, Vol. 43, Issue 8, August 2010, pp. 1491-1499.
11
[11] Prengel H.G., Jindal P.C., Wendt K.H., Santhanam A.T., Hegde P.L., Penich R.M., A new class of high performance PVD coatings for carbide cutting tools, Surface and Coatings Technology, Vol. 139, Issue 1, May 2001, pp. 25-34.
12
[12] Knutsson A, Johansson M.P., Karlsson L., Oden M., Machining performance and decomposition of TiAlN/TiN multilayer coated metal cutting inserts, Surface and Coatings Technology, Vol. 205, Issue 16, 15 May 2011, pp. 4005-4010.
13
[13] Derflinger V.H., Schutze A., Anter M., Mechanical and Structural properties of various alloyed TiAlN-based hard coatings, Surface and Coatings Technology, Vol. 200, Issues 16-17, 27 April 2006, pp. 4693-4700.
14
[14] Fox-Ravinovich G.S., Weatherly G.C., Dodonov A.I., Kovalev A.I., Shuster L.S., Veldhuis S.C., Dosbaeva G.K., Wainstein D.L., Migranov M.S., Nano-crystalline filtered arc deposited (FAD) TiAlN PVD coatings for high-speed machining applications, Surface and Coatings Technology, Vol. 177-178, 30 January 2004, pp. 800-811.
15
[15] Walsh R., Hndbook of Machining and Metalworking Calculations, ISBN-13: 978-0071360661, December 22, 2000.
16
[16] Devia D.M., Restrepo-Parra E.,Arango P.J., Tschiptschin A.P., Velez J.M., TiAlN coatings deposited by triode magnetron sputtering varying the bias voltage, Applied Surface Science, Vol. 257, Issue 14, 1 May 2011, pp. 6181-6185.
17