ORIGINAL_ARTICLE
Free Vibration of Annular Plates by Discrete Singular Convolution and Differential Quadrature Methods
Plates and shells are significant structural components in many engineering and industrial applications. In this study, the free vibration analysis of annular plates is investigated. To this aim, two different numerical methods including the differential quadrature and the discrete singular convolution methods are performedfor numerical simulations. Moreover, the Frequency values are obtained via these two methods and finally, the performance of these methods is investigated.
http://jacm.scu.ac.ir/article_12364_88f0f2fec3a098cf8da424a85eb4d15e.pdf
2016-08-01T11:23:20
2019-03-23T11:23:20
128
133
10.22055/jacm.2016.12364
Differential quadrature
discrete singular convolution
annular plate
free vibration
Kadir
Mercan
mercankadir32@gmail.com
true
1
Akdeniz University Civil ENG.DEPT.
Akdeniz University Civil ENG.DEPT.
Akdeniz University Civil ENG.DEPT.
AUTHOR
Hakan
Ersoy
hakanersoy@akdeniz.edu.tr
true
2
Akdeniz University Mechanical Engineering Dept.
Akdeniz University Mechanical Engineering Dept.
Akdeniz University Mechanical Engineering Dept.
AUTHOR
Omer
Civalek
civalek@yahoo.com
true
3
Civil Engineering Dept.
Civil Engineering Dept.
Civil Engineering Dept.
LEAD_AUTHOR
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1
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[20] Civalek, Ö., “The determination of frequencies of laminated conical shells via the discrete singular convolution method”, J Mech Mater Struct, Vol. 1, No. 1, pp. 163-182, 2006.
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[21] Civalek, Ö., “A four-node discrete singular convolution for geometric transformation and its application to numerical solution of vibration problem of arbitrary straight-sided quadrilateral plates”, Appl Math Model, Vol. 33, pp. 300–314, 2009.
21
[22] Civalek, Ö., “Three-dimensional vibration, buckling and bending analyses of thick rectangular plates based on discrete singular convolution method”, Int J Mech Sci, Vol. 49, No.6, pp.752-765, 2007.
22
[23] Demir, Ç., Mercan, K., Civalek, Ö., “Determination of critical buckling loads of isotropic, FGM and laminated truncated conical panel”, Compos Part B: Eng Vol. 94, pp. 1-10, 2016.
23
[24] Civalek, Ö., “Fundamental frequency of isotropic and orthotropic rectangular plates with linearly varying thickness by discrete singular convolution method”, Appl Math Model, Vol. 33, No. 10, pp. 3825-3835, 2009.
24
[25] Civalek, Ö., “Free vibration analysis of symmetrically laminated composite plates with first-order shear deformation theory (FSDT) by discrete singular convolution method”, Finite Elem Anal Des Vol. 44, pp. 725-731, 2008.
25
[26] Civalek, Ö., “Vibration analysis of conical panels using the method of discrete singular convolution”, Commun Numer Methods Eng, Vol. 24, pp. 169-181, 2008.
26
[27] Civalek, Ö., Korkmaz, A, Demir, Ç., “Discrete singular convolution approach for buckling analysis of rectangular Kirchhoff plates subjected to compressive loads on two opposite edges”. Adv Eng Softw, Vol. 41, pp. 557-560, 2010.
27
[28] Civalek, Ö., “Analysis of thick rectangular plates with symmetric cross-ply laminates based on first-order shear deformation theory”, J Compos Mater, Vol. 42, pp. 2853–2867, 2008.
28
[29] Seçkin, A., Sarıgül, A.S., “Free vibration analysis of symmetrically laminated thin composite plates by using discrete singular convolution (DSC) approach: algorithm and verification”, J Sound Vib, Vol. 315, pp. 197-211, 2008.
29
[30] Seçkin, A., “Modal and response bound predictions of uncertain rectangular composite plates based on an extreme value model”, J Sound Vib, Vol. 332, pp.1306-1323, 2013.
30
[31] Xin, L., Hu, Z., “Free vibration of layered magneto-electro-elastic beams by SSDSC approach”, Compos Struct, Vol. 125, pp. 96-103, 2015.
31
[32] Xin. L., Hu, Z., “Free vibration of simply supported and multilayered magnetoelectro-elastic plates”, Comp Struct, Vol. 121, pp. 344-350, 2015.
32
[33] Wang, X., Xu, S., “Free vibration analysis of beams and rectangular plates with free edges by the discrete singular convolution”, J Sound Vib, Vol. 329, pp. 1780-1792, 2010.
33
[34] Wang, X., Wang, Y., Xu, S., “DSC analysis of a simply supported anisotropic rectangular plate”, Compos Struct, Vol. 94, pp. 2576-2584, 2012.
34
[35] Duan, G., Wang, X., Jin, C., “Free vibration analysis of circular thin plates with stepped thickness by the DSC element method”, Thin Walled Struct, Vol. 85, pp. 25-33, 2014.
35
[36] Baltacıoğlu, A.K., Civalek, Ö., Akgöz, B., Demir, F., “Large deflection analysis of laminated composite plates resting on nonlinear elastic foundations by the method of discrete singular convolution”, Int J Pres Vessel Pip, Vol. 88, pp. 290-300, 2011.
36
[37] Civalek, Ö., Akgöz, B., “Vibration analysis of micro-scaled sector shaped graphene surrounded by an elastic matrix”, Comp. Mater. Sci., Vol. 77, pp. 295-303, 2013.
37
[38] Gürses, M., Civalek, Ö., Korkmaz, A., Ersoy, H., “Free vibration analysis of symmetric laminated skew plates by discrete singular convolution technique based on first-order shear deformation theory”, Int J Numer Methods Eng, Vol.79, pp. 290-313, 2009.
38
[39] Baltacıoglu, A.K., Akgöz, B., Civalek, Ö., “Nonlinear static response of laminated composite plates by discrete singular convolution method”, Compos Struct, Vol. 93, pp. 153-161, 2010.
39
[40] Gürses, M., Akgöz, B., Civalek, Ö., “Mathematical modeling of vibration problem of nano-sized annular sector plates using the nonlocal continuum theory via eight-node discrete singular convolution transformation”, Appl Math Comput, Vol. 219, pp. 3226–3240, 2012.
40
[41] Mercan, K., Civalek, Ö., “DSC method for buckling analysis of boron nitride nanotube (BNNT) surrounded by an elastic matrix”, Comp Struct, Vol. 143, pp. 300-309, 2016.
41
[42] Akgöz, B., Civalek, O., “A new trigonometric beam model for buckling of strain gradient microbeams”, Int J Mech Sci Vol. 81, pp. 88-94, 2014.
42
[43] Civalek, Ö., Akgöz, B., “Static analysis of single walled carbon nanotubes (SWCNT) based on Eringen’s nonlocal elasticity theory”, Int J Eng Appl Sci, Vol. 1, pp. 47-56, 2009.
43
[44] Demir, Ç., Civalek, Ö., “Torsional and longitudinal frequency and wave response of microtubules based on the nonlocal continuum and nonlocal discrete models”, Appl Mathl Model, Vol. 37, pp. 9355-9367, 2013.
44
[45] Akgöz, B., Civalek, Ö., “Shear deformation beam models for functionally graded microbeams with new shear correction factors”, Comp Struct, Vol. 112, pp. 214-225, 2014.
45
[46] Xin, L., Hu, Z., “Free vibration analysis of laminated cylindrical panels using discrete singular convolution”, Comp Struct, Vol. 149, pp. 362-368, 2016.
46
[47] Tornabene, F., Fantuzzi, N., Viola, E., Ferreira, A.J.M., “Radial basis function method applied to doubly-curved laminated composite shells and panels with a General Higher-order Equivalent Single Layer formulation”, Compos Part B: Eng, Vol. 55, pp. 642–659, 2013.
47
[48] Tornabene, F., Viola, E., “Inman DJ. 2-D differential quadrature solution for vibration analysis of functionally graded conical, cylindrical shell and annular plate structures”, J Sound Vib, Vol. 328, pp. 259–290, 2009.
48
[49] Civalek, Ö., “Application of Differential Quadrature (DQ) and Harmonic Differential Quadrature (HDQ) For Buckling Analysis of Thin Isotropic Plates and Elastic Columns”, Eng Struct, Vol. 26, No. 2, pp. 171-186,2004.
49
[50] Civalek, Ö., “Geometrically non-linear static and dynamic analysis of plates and shells resting on elastic foundation by the method of polynomial differential quadrature (PDQ)”, PhD. Thesis, Fırat University, (in Turkish), Elazığ, 2004.
50
[51] Liew, K.M., Han, J-B, Xiao, Z.M., and Du, H., “Differentiel Quadrature Method for Mindlin plates on Winkler foundations”, Int. J. Mech. Sci., Vol. 38, No. 4, pp. 405-421, 1996.
51
[52] Striz, A.G., Wang, X., Bert, C.W., “Harmonic differential quadrature method and applications to analysis of structural components”, Acta Mechanica, Vol. 111, pp. 85-94, 1995.
52
[53] Bert, C.W., Wang, Z., Striz, A.G., “Static and free vibrational analysis of beams and plates by differential quadrature method”, Acta Mechanica, Vol. 102, pp. 11-24, 1994.
53
[54] Du, H., Lim, M.K., Lin, R.M., “Application of generalized differential quadrature method to vibration analysis”, J Sound Vib,Vol. 181, No. 2, 279-93, 1995.
54
[55] Mercan, K, Demir, Ç., Civalek, Ö., "Vibration analysis of FG cylindrical shells with power-law index using discrete singular convolution technique." Curv Layer Struct, Vol. 3, No.1, pp. 82-90, 2016.
55
ORIGINAL_ARTICLE
Springbackward Phenomenon of a Transversely Isotropic Functionally Graded Composite Cylindrical Shell
This study provides an approach to predict the springback phenomenon during post-solidification cooling in a functionally graded hybrid composite cylindrical shell with a transverse isotropic structure. Here, the material properties are given with a general parabolic power-law function. During the theoretical analysis, an appropriate transformation is introduced in the equilibrium equation, which is resulting in a hypergeometrical differential equation. Thermoelastic solutions are obtained and analyzed for a homogeneous, nonhomogeneous, and elastic-plastic state. The solution is validated by applying it to the multilayered functionally graded cylindrical shell using the transfer or propagator matrix method.
http://jacm.scu.ac.ir/article_12453_4f251b9e37e05534954578425bbf937f.pdf
2016-08-01T11:23:20
2019-03-23T11:23:20
134
143
10.22055/jacm.2016.12453
Thermoelasticity
Functionally Graded Hybrid Composites
Cylindrical shell
Spring Backward Effect
V. R.
Manthena
vkmanthena@gmail.com
true
1
Department of Mathematics, RTM Nagpur University, Nagpur, India.
Department of Mathematics, RTM Nagpur University, Nagpur, India.
Department of Mathematics, RTM Nagpur University, Nagpur, India.
LEAD_AUTHOR
N. K.
Lamba
navneetkumarlamba@gmail.com
true
2
Deptt. of Mathematics, Shri Lemdeo Patil Mahavidyalya, Nagpur, India.
Deptt. of Mathematics, Shri Lemdeo Patil Mahavidyalya, Nagpur, India.
Deptt. of Mathematics, Shri Lemdeo Patil Mahavidyalya, Nagpur, India.
AUTHOR
G. D.
Kedar
gdkedar2013@gmail.com
true
3
Deptt. of Mathematics, RTM Nagpur University, Nagpur, India.
Deptt. of Mathematics, RTM Nagpur University, Nagpur, India.
Deptt. of Mathematics, RTM Nagpur University, Nagpur, India.
AUTHOR
[1] O’Neill, J. M., Rogers, T. G., and Spencer, A. J. M., “Thermally induced distortions in the moulding of laminated channel sections”, Math. Engg. Ind., Vol. 2, pp. 65-72, 1988.
1
[2] Wawner, T. O., and Gundel, D. B., “Investigation of the Reaction Kinetics between SiC Fibers and selectively Alloyed Titanium Matrices”, School of Engineering and Applied Science Technical Repot (Grant No. NAG-1-745, Department of Materials Science, University of Virginia, Charlottesville, VA, 1991.
2
[3] Birman, V., “Stability of functionally graded hybrid composite plates”, Composites Engineering, Vol. 5, pp. 913-921, 1995.
3
[4] Ootao, Y., and Tanigawa, Y., “Three-dimensional transient thermal stresses of functionally graded rectangular plate due to partial heating”, Journal of Thermal Stresses, Vol. 22, pp. 35-55, 1999.
4
[5] Reddy, J.N., “Analysis of functionally graded plates”, Int. J. Numer. Meth. Engg. , Vol. 47, pp. 663–684, 2000. [6] Ye, G. R., Chen, W. Q., and Cai, J. B., “A uniformly heated functionally graded cylindrical shell with transverse isotropy”, Mechanics Research Communications, Vol. 28, pp. 535-542, 2001.
5
[7] Kieback, B., Neubrand, A., and Riedel, H., “Processing techniques for functionally graded materials”, Mater Sci. Engg., A362, pp. 81-105, 2003.
6
[8] Sugano, Y., Chiba, R., Hirose, K., and Takahashi, K.,, “Material design for reduction of thermal stress in a functionally graded material rotating disk”, JSME International Journal Series A Solid Mechanics and Material Engineering, Vol. 47, pp. 189-197, 2004.
7
[9] Eraslan, A. N., and Akis, T., “Elastoplastic response of a long functionally graded tube subjected to internal pressure”, Turkish J. Eng. Env. Sci., Vol. 29, pp. 361-368, 2005.
8
[10] Ohmichi, M., and Noda, N., “The effect of oblique functional gradation to thermal stresses in the functionally graded infinite strip”, Acta Mechanica, Vol. 196, pp. 219-237, 2007.
9
[11] Huang, Y. H., and Han, X., “Transient Analysis of Functionally Graded Materials Plate using Reduced-Basis Methods”, Computational Mechanics, Proceedings of International Symposium on Computational Mechanics, China, 2007.
10
[12] Bobaru, F., “Designing optimal volume fractions for functionally graded materials with temperature dependent material properties”, J. Appl. Mech, Vol. 74, pp. 861-875, 2007.
11
[13] You, L. H., Wang, J. X., and Tang, B. P., “Deformations and stresses in annular disks made of functionally graded materials subjected to internal and/or external pressure”, Meccanica, Vol. 44, pp. 283-292, 2008.
12
[14] Paulino, G.H., “Multiscale and functionally graded materials”, In: Proceedings of the international conference FGM IX, Hawaii, 2008.
13
[15] Chien-Ching Ma, and Yi-Tzu Chen, “Theoretical analysis of heat conduction problems of nonhomogeneous functionally graded materials for a layer sandwiched between two half-planes”, Acta Mechanica, Vol. 221, Number 3-4, Page 223, 2011.
14
[16] Birman, V., Keil, T., and Hosder, S., “Functionally graded materials in Engineering, In: Structural interfaces and attachments in Biology”, Springer, New York, 2012.
15
[17] Chiba, R., and Sugano, Y., “Optimisation of material composition of functionally graded materials based on multiscale thermoelastic analysis”, Acta Mechanica, Vol. 223, pp. 891-909, 2012.
16
[18] Lamba, N. K., Khobragade, N. W., “Uncoupled thermoelastic analysis for a thick cylinder with radiation”, Theoretical and Applied Mechanics Letters, Vol. 2, pp. 21-35, 2012.
17
[19] Gaikwad, K., “Two-dimensional steady-state temperature distribution of a thin circular plate due to uniform internal energy generation”, Cogent Mathematics, Vol. 3, 1135720, 2016.
18
[20] Matveenko, V. P., Fedorov, A. Yu., and Shardakov, I. N., “Analysis of stress singularities at singular points of elastic solids made of functionally graded materials”, Doklady Physics, Vol. 61, pp. 24- 28, 2016. [21] Williams, T. O., Arnold, S. M., and Pindera, M. J., “An analytical/Numerical correlation study of the multiple concentric cylinder model for the thermoplastic response of metal matrix composites”, NASA Contractor Report 191142, Lewis Research Center, Cleveland, Ohio, 1993.
19
[22] Spencer, A. J. M., Watson, P., and Rogers, T. G., “Thermoelastic Distortions in laminated anisotropic tubes and channel section”, Journal of Thermal Stresses, Vol. 15, pp. 129-141, 1992.
20
[23] Varghese V., and Khobragade, N.W., “Mathematical analysis of functionally graded hybrid composite channel section in the interfacial zone during post-solidification cooling”, Adv. And Appl in fluid Mechanics, Vol. 3, pp. 41-55, 2008.
21
[24] Arnold, S. M., Arya, V. K., and Melis, M. E., “Elastic/Plastic analysis of advanced composites investigating the use of the complaint layer concept in reducing residual stresses resulting from processing”, NASA Technical Memorandum 103204, Lewis Research Center, 1990.
22
[25] Abramowitz, M., and Stegun, I. A., (Editors), “Handbook of Mathematical Functions with Formulas, Graphs and Mathematical Tables”, National Bureau of Standards Applied Mathematics, Washington, 1964.
23
ORIGINAL_ARTICLE
Conjugate and Directional Chaos Control Methods for Reliability Analysis of CNT–Reinforced Nanocomposite Beams under Buckling Forces; A Comparative Study
The efficiency and robustness of reliability methods are two important factors in the first-order reliability method (FORM). The conjugate choice control (CCC) and directional chaos control method (DCC) are developed to improve the robustness and efficiency of the FORM formula using the stability transformation method. In this paper, the CCC and DCC methods are applied for the reliability analysis of a nanocomposite beam as a complex engineering problem, which is reinforced by carbon nanotubes (CNTs) under buckling force. The probabilistic model for nanocomposite beam is developed through the buckling failure mode which is computed by using the Euler-Bernoulli beam model. The robustness and efficiency CCC and DCC are compared using the stable solution and a number of call limit state functions. The results demonstrate that the CCC method is more robust than the DCC in this case, while the DCC method is simpler than the CCC.
http://jacm.scu.ac.ir/article_12516_73ba1fbeb8bc9c72b9a4ab117f913bfc.pdf
2016-08-01T11:23:20
2019-03-23T11:23:20
144
151
10.22055/jacm.2016.12516
Reliability analysis
Nanocomposite beam
Conjugate chaos control
Directional chaos control
Behrooz
Keshtegar
bkeshtegar@uoz.ac.ir
true
1
University of Zabol
University of Zabol
University of Zabol
AUTHOR
Zeng
meng
mengz@hfut.edu.cn
true
2
hefei university of technology
hefei university of technology
hefei university of technology
LEAD_AUTHOR
[1] Keshtegar, B., Limited Conjugate Gradient Method for Structural Reliability Analysis, Engineering with Computers, doi:10.1007/s00366-016-0493-7, pp. 1-9, 2016.
1
[2] Rashki, M., Miri, M. and Moghaddam, M.A., A New Efficient Simulation Method to Approximate the Probability of Failure and Most Probable Point. Structural Safety, Vol. 39, pp. 22-9, 2012.
2
[3] Keshtegar, B. and Miri, M., An Enhanced HL-RF Method for the Computation of Structural failure probability Based on Relaxed Approach, Civil Engineering Infrastructures, Vol. 1:, pp. 69-80, 2013.
3
[4] Keshtegar, B. and Miri, M., Introducing Conjugate Gradient Optimization for Modified HL-RF Method, Engineering Computations, Vol. 31, pp. 775-790, 2014.
4
[5] Yang, D., Chaos Control for Numerical Instability of First Order Reliability Method, Commun. Non-linear Sci. Numer. Simulat., Vol. 15, pp. 3131–3141, 2010.
5
[6] Gong, J.X. and Yi, P., A Robust Iterative Algorithm for Structural Reliability Analysis, Struct. Multidisc. Optim., Vol. 43, pp. 519–527, 2011.
6
[7] Liu, P.L. and Kiureghian, A.D., Optimization Algorithms for Structural Reliability, Struct. Saf., Vol. 9, pp. 161–177, 1991.
7
[8] Meng, Z., Li, G., Yang, D. and Zhan, L., A New Directional Stability Transformation Method of Chaos Control for First Order Reliability Analysis, Struct. Multidiscipl. Optim., DOI: 10.1007/s00158-016-1525-z, pp. 1-12, 2016.
8
[9] Keshtegar, B., Stability Iterative Method for Structural Reliability Analysis Using a Chaotic Conjugate Map, Nonlinear Dyn., Vol. 84, No. 4, pp. 2161-2174, 2016.
9
[10] Keshtegar, B., Chaotic Conjugate Stability Transformation Method for Structural Reliability Analysis, Computer Methods in Applied Mechanics and Engineering, Vol. 310, pp. 866-885, 2016.
10
[11] Keshtegar, B. and Miri, M., Reliability Analysis of Corroded Pipes Using Conjugate HL–RF Algorithm Based on Average Shear Stress Yield Criterion, Engineering Failure Analysis, Vol. 46, pp. 104–117, 2014.
11
[12] Vodenitcharova, T. and Zhang, L., Bending and Local Buckling of a Nanocomposite Beam Reinforced by a Single-Walled Carbon Nanotube, International journal of solids and structures, Vol. 43, pp. 3006-3024, 2006.
12
[13] Thai, H-T and Vo, T.P., A Nonlocal Sinusoidal Shear Deformation Beam Theory with application to Bending, Buckling, and Vibration of Nanobeams, International Journal of Engineering Science, Vol. 54, pp. 58-66, 2012.
13
[14] Arani, A.G., Maghamikia, S., Mohammadimehr, M. and Arefmanesh, A., Buckling Analysis of Laminated Composite Rectangular Plates Reinforced by SWCNTs Using Analytical and Finite Element Methods, Journal of Mechanical Science and Technology, Vol. 25, pp. 809-820, 2011.
14
[15] Rafiee, M., Yang, J. and Kitipornchai, S., Thermal Bifurcation Buckling of Piezoelectric Carbon Nanotube Reinforced Composite Beams, Computers & Mathematics with Applications, Vol. 66, pp. 1147-1160, 2013.
15
[16] Wattanasakulpong, N. and Ungbhakorn, V., Analytical Solutions for Bending, Buckling and Vibration Responses of Carbon Nanotube-Reinforced Composite Beams Resting on Elastic Foundation, Computational Materials Science, Vol. 71, pp. 201-208, 2013.
16
[17] Kolahchi, R., Bidgoli, M.R., Beygipoor, G. and Fakhar, M.H., A Nonlocal Nonlinear Analysis for Buckling in Embedded FG-SWCNT-Reinforced Microplates Subjected to Magnetic Field, Journal of Mechanical Science and Technology, Vol. 29, pp. 3669-3677, 2015.
17
[18] Mosharrafian, F. and Kolahchi, R., Nanotechnology, Smartness and Orthotropic Nonhomogeneous Elastic Medium Effects on Buckling of Piezoelectric Pipes, Struct Eng Mech., Vol. 58, pp. 931-947, 2016.
18
[19] Barzoki, A.M., Arani, A.G., Kolahchi, R. and Mozdianfard, M., Electro-Thermo-Mechanical Torsional Buckling of a Piezoelectric Polymeric Cylindrical Shell Reinforced by DWBNNTs with an Elastic core, Applied Mathematical Modelling, Vol.;36, 2983-2995, 2012.
19
[20] Kolahchi, R., Hosseini, H. and Esmailpour, M., Differential Cubature and Quadrature-Bolotin Methods for Dynamic Stability of Embedded Piezoelectric Nanoplates Based on Visco-Nonlocal-Piezoelasticity Theories, Composite Structures, Vol. 157, pp. 174-186, 2016.
20
[21] Tan, P. and Tong, L., Micro-Electromechanics Models for Piezoelectric-Fiber-Reinforced Composite Materials, Composites science and technology, Vol. 61, pp. 759-769, 2001.
21
ORIGINAL_ARTICLE
Generalized Warping In Flexural-Torsional Buckling Analysis of Composite Beams
The finite element method is employed for the ﬂexural-torsional linear buckling analysis of beams of arbitrarily shaped composite cross-section taking into account generalized warping (shear lag effects due to both ﬂexure and torsion). The contacting materials, that constitute the composite cross section, may include a finite number of holes. A compressive axial load is applied to the beam. The influence of nonuniform warping is considered by the usage of one independent warping parameter for each warping type, i.e. shear warping in each direction and primary as well as secondary torsional warping, multiplied by the respective warping function. The calculation of the four aforementioned warping functions is implemented by the solution of a corresponding boundary value problem (longitudinal local equilibrium equation). The resulting stress field is corrected through a shear stress correction. The equations are formulated with reference to the independent warping parameters additionally to the displacement and rotation components.
http://jacm.scu.ac.ir/article_12525_cfcd6a2d7bf38582043a42498f071397.pdf
2016-08-01T11:23:20
2019-03-23T11:23:20
152
173
10.22055/jacm.2016.12525
Nonuniform warping
Shear lag
Shear deformation
Composite beams
Flexural-torsional buckling
Amalia
Argyridi
a.argyridi@gmail.com
true
1
Institute of Structural Analysis &amp; Aseismic Research
School of Civil Engineering
National Technical University of Athens
Zografou Campus
Athens 157 80, Greece
Institute of Structural Analysis &amp; Aseismic Research
School of Civil Engineering
National Technical University of Athens
Zografou Campus
Athens 157 80, Greece
Institute of Structural Analysis &amp; Aseismic Research
School of Civil Engineering
National Technical University of Athens
Zografou Campus
Athens 157 80, Greece
LEAD_AUTHOR
Evangelos
Sapountzakis
cvsapoun@central.ntua.gr
true
2
Institute of Structural Analysis & Aseismic Research
School of Civil Engineering
National Technical University of Athens
Zografou Campus
Athens 157 80, Greece
Institute of Structural Analysis & Aseismic Research
School of Civil Engineering
National Technical University of Athens
Zografou Campus
Athens 157 80, Greece
Institute of Structural Analysis & Aseismic Research
School of Civil Engineering
National Technical University of Athens
Zografou Campus
Athens 157 80, Greece
AUTHOR
[1] Reissner, E., “Analysis of shear lag in box beams by the principle of minimum potential energy.” Q. Appl. Math., Vol. 41, pp. 268 – 278, 1946.
1
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58
ORIGINAL_ARTICLE
Deformation Characteristics of Composite Structures
The composites provide design flexibility because many of them can be moulded into complex shapes. The carbon fibre-reinforced epoxy composites exhibit excellent fatigue tolerance and high specific strength and stiffness which have led to numerous advanced applications ranging from the military and civil aircraft structures to the consumer products. However, the modelling of the beams undergoing the arbitrarily large displacements and rotations, but small strains, is a common problem in the application of these engineering composite systems. This paper presents a nonlinear finite element model which is able to estimate the deformations of the fibre-reinforced epoxy composite beams. The governing equations are based on the Euler-Bernoulli beam theory (EBBT) with a von Kármán type of kinematic nonlinearity. The anisotropic elasticity is employed for the material model of the composite material. Moreover, the characterization of the mechanical properties of the composite material is achieved through a tensile test, while a simple laboratory experiment is used to validate the model. The results reveal that the composite fibre orientation, the type of applied load and boundary condition, affect the deformation characteristics of the composite structures. The nonlinearity is an important factor that should be taken into consideration in the analysis of the fibre-reinforced epoxy composites.
http://jacm.scu.ac.ir/article_12515_012626b5b1aa42624b3e4979ade796c5.pdf
2016-08-01T11:23:20
2019-03-23T11:23:20
174
191
10.22055/jacm.2016.12515
Anisotropic elasticity
composite material
large displacement
Theddeus T.
AKANO
takano@unilag.edu.ng
true
1
Department of Systems Engineering, University of Lagos, NIGERIA
Department of Systems Engineering, University of Lagos, NIGERIA
Department of Systems Engineering, University of Lagos, NIGERIA
AUTHOR
Omotayo. A
FAKINLEDE
oafak@unilag.edu.ng
true
2
Department of Systems Engineering, University of Lagos, NIGERIA
Department of Systems Engineering, University of Lagos, NIGERIA
Department of Systems Engineering, University of Lagos, NIGERIA
AUTHOR
Patrick
Olayiwola
olayiwola_patrickshola@yahoo.com
true
3
Bells University of Technology
Bells University of Technology
Bells University of Technology
LEAD_AUTHOR
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1
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55
ORIGINAL_ARTICLE
Modified Rectangular Patch Antenna Loaded With Multiple C Slots for Multiple Applications
A new multiple C-slotted microstrip patch antenna is proposed in the present study. A patch antenna is a wide-beam narrowband antenna. The microstrip patch antenna consists of a very thin metallic strip (patch) placed a small fraction of a wavelength above a ground plane. The patch can be designed in any possible shape and normally made of conducting materials such as copper or gold. This study presents a design of a C-Slotted microstrip patch antenna for multiple applications. The proposed antenna's characteristics include a low cost, easy fabrication and good isolation along with Quad different frequency bands which are centered at 1.60 GHz, 2.50 GHz, 4.70 GHz and 5.50 GHz for parameter S11. The antenna is designed, simulated, and optimized for Quad band performance by using IE3D software. The C-shape-slotted patch antenna is designed on a FR4 substrate with the thickness of 1.59 mm and the relative permittivity of 4.4. The proposed patch dimension is 16*16 mm and it utilizes the microstrip line feed. The simulated results parameter S11 and S12, shows that the antenna can cover the bands of several applications including GPS (1.2-1.6 GHz), GSM (1.8-1.9 GHz) and WiMAX (2.3-5.8 GHz). Simulation results are presented in terms of Resonant Frequency, Return Loss, Voltage Standing Wave Ratio (VSWR) and Radiation Pattern.
http://jacm.scu.ac.ir/article_12526_05757c3e6ba8ad3459696bbf7348aece.pdf
2016-08-01T11:23:20
2019-03-23T11:23:20
192
199
10.22055/jacm.2016.12526
Microstrip antenna
Slotted patch
GPS
GSM
WiMAX
Amit
Jain
jain.2102@gmail.com
true
1
Poorima College of Engineering, Jaipur, Rajasthan, India
Poorima College of Engineering, Jaipur, Rajasthan, India
Poorima College of Engineering, Jaipur, Rajasthan, India
AUTHOR
Monika
Surana
suranamonika@gmail.com
true
2
Poorima College of Engineering, Jaipur, Rajasthan, India
Poorima College of Engineering, Jaipur, Rajasthan, India
Poorima College of Engineering, Jaipur, Rajasthan, India
AUTHOR
[1] C.A.Balanis “Antenna Theory, Analysis and Design” JOHN WILEY & SONS, INC, NEW YORK 1997.
1
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2
[3] Mamta Devi Sharma, Abhishek Katariya, Dr. R. S. Meena, “E Shaped Patch Microstrip Antenna for WLAN Application Using Probe Feed and Aperture Feed” IEEE conference publications, 2012.
3
[4] M. J. Kim, C. S. Cho, and J. Kim, “A dual band printed dipole antenna with spiral structure for WLAN application,” IEEE Microw. Wireless Compon. Lett., Vol. 15, no. 12, pp. 910–912, Dec. 2005.
4
[5] A.D.Yaghjian and S. R. Best, "Impedance, Bandwidth, and Q of Antennas," IEEE Transactions on Antennas and Propagation, AP-53, 4, April 2005, pp. 1 298- 1 324.
5
[6] Bhardwaj, Dheeraj, et al. "Design of square patch antenna with a notch on FR4 substrate." Microwaves, Antennas & Propagation, Vol.51, No.3, 880-885, 2008.
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[7] Zaker, Reza, Changiz Ghobadi, and Javad Nourinia,"Bandwidth enhancement of novel compact single and dual band-notched printed monopole antenna with a pair of L-shaped slots." Antennas and Propagation, IEEE Transactions on Vol.57, No.12, 2009.
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[8] S. Imran Hussain Shah, Shahid Bashir, Syed Dildar Hussain Shah, “Compact Multiband microstrip patch antenna using Defected Ground structure (DGS)”, The 8th European Conference on Antennas and Propagation (EuCAP 2014), IEEE Transactions, 978-88-907018, pp. 2367-2370, September 2014.
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[9] T. H. Kim and D. C. Park, “Compact dual-band antenna with double Lslits for WLAN operations,” IEEE Antennas Wirel. Propag. Lett., Vol. 4, no. 1, pp. 249–252, 2005.
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[10] Abutarboush. H.F., Sharmim. A., “Wide frequency indepeııdently controlled dual-band inkjet printed antenna.” Microwaves, Antennas & Propagation, lET , Vol.8, no.1, pp.52,56, January 8 2014
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[13] IE3D Simulation Software, Zealand, version 14.05.2008.
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