ORIGINAL_ARTICLE
Low Velocity Impact Response of Laminated Composite Truncated Sandwich Conical Shells with Various Boundary Conditions Using Complete Model and GDQ Method
In this paper, the dynamic analysis of the composite sandwich truncated conical shells (STCS) with various boundary conditions subjected to the low velocity impact was studied analytically, based on the higher order sandwich panel theory. The impact was assumed to occur normally over the top face-sheet, and the contact force history was predicted using two solution models of the motion which were derived based on Hamilton’s principle by considering the displacement continuity conditions between the layers⸳ In order to obtain the contact force and the displacement histories, the differential quadrature method (DQM) was used. In this investigation, the effects of different parameters such as the number of layers of the face sheets, the boundary conditions, the semi vertex angle of the cone, and the impact velocity of the impactor on the impact response of the complete model were studied.
https://jacm.scu.ac.ir/article_12547_020155f5c618014a483f840fe2775f98.pdf
2017-04-01
1
15
10.22055/jacm.2017.12547
Low velocity impact
STCS
DQM
Hertzian contact law
complete model
A.
Azizi
1
Department of Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
AUTHOR
S. Mohammad Reza
Khalili
smrkhalili2005@gmail.com
2
Centre of Excellence for Research in Advanced Materials and Structures, Faculty of Mechanical Engineering, K.N. Toosi University of Technology, Tehran, Iran
LEAD_AUTHOR
K.
Malekzadeh Fard
3
Malek Ashtar University of Technology, Department of Mechanical Engineering, 4th Kilameter, Makhsous RD, Tehran, Iran
AUTHOR
[1] Frostig, Y. and Thomsen, O.T., High-order free vibration of sandwich panels with a flexible core, Int. J. Solids Struct., Vol. 41(5), pp. 1697-1724, 2004.
1
[2] Sofiyev, A.H., Non-linear buckling behavior of FGM truncated conical shells subjected to axial load, Int. J. Non-Linear Mech., Vol. 46(5), pp. 711-719, 2011.
2
[3] Chai, G.B. and Zhu, S., A review of low-velocity impact on sandwich structures, Proceed. Inst. Mec. Eng., Part L: J. Mat. Des. Applicat., Vol. 225(4), pp. 207-230, 2011.
3
[4] Abrate, S., Impact on composite structures, Cambridge university press, 2005.
4
[5] Shivakumar, K.N., Elber, W. and Illg, W., Prediction of low-velocity impact damage in thin circular laminates, AIAA J., Vol. 23(3), pp. 442-449, 1985.
5
[6] Anderson, T.A., An investigation of SDOF models for large mass impact on sandwich composites, Compos. Part B: Eng., Vol. 36(2), pp. 135-142, 2005.
6
[7] Gong, S.W. and Lam, K.Y., Effects of structural damping and stiffness on impact response of layered structure, AIAA J., Vol. 38(9), pp. 1730-1735, 2000.
7
[8] Malekzadeh, K., Khalili, M.R. and Mittal, R.K., Response of composite sandwich panels with transversely flexible core to low-velocity transverse impact: A new dynamic model, Int. J. Impact Eng., Vol. 34(3), pp. 522-543, 2007.
8
[9] Khalili, M.R., Malekzadeh, K. and Mittal, R.K., Effect of physical and geometrical parameters on transverse low-velocity impact response of sandwich panels with a transversely flexible core, Compos. Struct., Vol. 77(4), pp. 430-443, 2007.
9
[10] Wilkins, D.J., Bert, C.W. and Egle, D.M., Free vibrations of orthotropic sandwich conical shells with various boundary conditions, J. Sound Vib., Vol. 13(2), pp. 211-228, 1970.
10
[11] Struk, R., Non-linear stability problem of an open conical sandwich shell under external pressure and compression, Int. J. Non-linear Mech., Vol. 19(3), pp. 217-233, 1984.
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[12] Bardell, N.S., Langley, R.S., Dunsdon, J.M. and Aglietti, G.S., An h–p finite element vibration analysis of open conical sandwich panels and conical sandwich frusta, J. Sound Vib., Vol. 226(2), pp. 345-377, 1999.
12
[13] Malekzadeh Fard, K.M.and Livani, M., New enhanced higher order free vibration analysis of thick truncated conical sandwich shells with flexible cores, Struct. Eng. Mech., Vol. 55(4), pp. 719-742, 2015.
13
[14] Reddy J., Mechanics of laminated composite plates and shells, theory and application, CRC Press, Boca Raton FL, 2003.
14
[15] Kheirikhah, M.M., Khalili, S.M.R. and Malekzadeh Fard, K., Biaxial buckling analysis of soft-core composite sandwich plates using improved high-order theory, Europ. J. Mech. A/Solids, Vol. 31, pp. 54e66, 2012.
15
[16] Garg, A.K., Khare, R.K. and Kant, T., Higher-order closed-form solutions for free vibration of laminated composite and sandwich shells, J. Sandw. Struct. Mat., Vol. 8(3), pp. 205-235, 2006.
16
[17] Reissner, E., On a variational theorem for finite elastic deformations, J. Math. Phys, Vol. 32(2-3), pp. 129-135, 1953.
17
[18] Carvalho, A. and Soares, C.G., Dynamic Response of Rectangular Plates of Composite Materials Subjected to Impact Loads, Compos. Struct., Vol. 34, pp. 55–63, 1996.
18
[19] Zheng, D. and Binienda, W.K., Analysis of Impact Response of Composite Laminates under Pre-stress, ASCE, Vol. 4, No. 197, pp. 211-219, 2008.
19
[20] Malekzadeh Fard, K. and Gholami, M., Analysis of Impact Dynamic Response of Doubly Curved Composite Laminated Shell under Initial Stresses, Aerosp. Mech. J., Vol. 10, No. 3, pp. 73–88, 2013.
20
[21] Kolahchi, R., Safari, M. and Esmailpour, M., Dynamic stability analysis of temperature-dependent functionally graded CNT-reinforced visco-plates resting on orthotropic elastomeric medium, Compos. Struct, Vol. 150, pp. 255–265, 2016.
21
[22] Ghorbanpour Arani, A., Kolahchi, R. and Zarei, M.Sh., Visco-surface-nonlocal piezoelasticity effects on nonlinear dynamic stability of graphene sheets integrated with ZnO sensors and actuators using refined zigzag theory, Compos. Struct., Vol. 132, pp. 506–526, 2015.
22
[23] Kolahchi, R. and Moniribidgoli, A.M., Size-dependent sinusoidal beam model for dynamic instability of single-walled carbon nanotubes, Appl. Math. Mech. -Engl. Ed., Vol. 37(2), pp. 265–274, 2016.
23
ORIGINAL_ARTICLE
Free Vibration of a Thick Sandwich Plate Using Higher Order Shear Deformation Theory and DQM for Different Boundary Conditions
In this paper, the effect of different boundary conditions on the free vibration analysis response of a sandwich plate is presented using the higher order shear deformation theory. The face sheets are orthotropic laminated composites that follow the first order shear deformation theory (FSDT) based on the Rissners-Mindlin (RM) kinematics field. The motion equations are derived considering the continuity boundary conditions between the layers based on the energy method and Hamilton's principle. The frequency and mode shapes of the structure are obtained using the differential quadrature method (DQM). The effects of different parameters such as the face sheet-to-core stiffness ratio, the boundary conditions, and the core-to-face sheet thickness ratio on the frequency of the sandwich plate are shown. Moreover, the numerical results indicate that the frequency of the CCCC and CFFF sandwich plates predict the higher and lower frequency, respectively.
https://jacm.scu.ac.ir/article_12548_ecd28795f211afb60ab023fd64fa1fac.pdf
2017-04-01
16
24
10.22055/jacm.2017.12548
Sandwich plate
Vibration
DQM
Higher order theory
FSDT
M.
Nasihatgozar
1
Department of Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
AUTHOR
S. Mohammad Reza
Khalili
smrkhalili2005@gmail.com
2
Centre of Excellence for Research in Advanced Materials and Structures, Faculty of Mechanical Engineering, K.N. Toosi University of Technology, Tehran, Iran
LEAD_AUTHOR
[1] Noor, A.K., Burton, W.S. and Bert, C.W., Computational models for sandwich panels and shells, Appl. Mech. Rev., Vol. 49(3), pp. 155-199, 1996.
1
[2] Bhimaraddi, A., A higher order theory for free vibration analysis of circular cylindrical shells, Int. J. Solids Struct., Vol. 20(7), pp. 623-630, 1984.
2
[3] Leissa, A.W. and Chang, J.D., Elastic deformation of thick, laminated composite shells, Compos. Struct., Vol. 35(2), pp.153-170, 1996.
3
[4] Khalili, S.M.R., Davar, A. and Malekzadeh Fard, K., Free vibration analysis of homogeneous isotropic circular cylindrical shells based on a new three-dimensional refined higher-order theory, Int. J. Mech. Sci., Vol. 56(1), pp.1-25, 2012.
4
[5] Thai, C.H., Nguyen-Xuan, H., Nguyen-Thanh, N. and Rabczuk, T., Static, free vibration, and buckling analysis of laminated composite Reissner–Mindlin plates using NURBS-based isogeometric approach, Int. J. Numeric. Meth. Eng., Vol. 91(6), pp.571-603, 2012.
5
[6] Valizadeh, N., Natarajan, S., Gonzalez-Estrada, O.A., Rabczuk, T., Quoc Bui, T. and Bordas, S.P.A., NURBS-based finite element analysis of functionally graded plates, pp. Static bending, vibration, buckling and flutter, Compos. Struct., Vol. 99(0), pp.309-326, 2013.
6
[7] Kapoor, H. and Kapania, R.K., Geometrically nonlinear NURBS isogeometric finite element analysis of laminated composite plates, Compos. Struct., Vol. 94(12), pp.3434-3447, 2012.
7
[8] Viola, E., Tornabene, F.and Fantuzzi, N., General higher-order shear deformation theories for the free vibration analysis of completely doubly-curved laminated shells and panels, Compos. Struct., Vol. 95(0), pp.639-666, 2013.
8
[9] Lal, R. and Rani, R., On radially symmetric vibrations of non-uniform annular sandwich plates, Thin-Wall. Struct., Vol. 94, pp. 562–576, 2015.
9
[10] Nguyen, T.K., Nguyen, V.H., Chau-Dinh, T., Vo, T.P. and Nguyen-Xuan, H., Static and vibration analysis of isotropic and functionally graded sandwich plates using an edge-based MITC3 finite elements, Compos. Part B: Eng., Vol. 107, pp. 162–173, 2016.
10
[11] Reddy, J., Mechanics of laminated composite plates and shells, theory and application, CRC Press, Boca Raton FL, 2003.
11
[12] Kheirikhah, M.M., Khalili, S.M.R. and Malekzadeh Fard, K., Biaxial buckling analysis of soft-core composite sandwich plates using improved high-order theory, Europ. J. Mech. - A/Solids, Vol. 31(1), pp.54-66, 2012.
12
[13] Kolahchi, R. and Rabani Bidgoli, M., Beygipoor, G. and Fakhar, M.H., A nonlocal nonlinear analysis for buckling in embedded FG-SWCNT-reinforced microplates subjected to magnetic field, J. Mech. Sci. Tech., Vol. 29, pp. 3669-3677, 2015.
13
[14] Malekzadeh Fard, K., Livani, M. and Gholami, M., Improved high-order bending analysis of double curved sandwich panels subjected to multiple loading conditions, Latin Americ. J. Solids Struct., Vol. 11(9), pp.1591-1614, 2014.
14
ORIGINAL_ARTICLE
Pole placement algorithm for control of civil structures subjected to earthquake excitation
In this paper the control algorithm for controlled civil structures subjected to earthquake excitation is thoroughly investigated. The objective of this work is the control of structures by means of the pole placement algorithm, in order to improve their response against earthquake actions. Successful application of the algorithm requires judicious placement of the closed-loop eigenvalues from the part of the designer. The pole placement algorithm was widely applied to control mechanical systems. In this paper, a modification in the mathematical background of the algorithm in order to be suitable for civil fixed structures is primarily presented. The proposed approach is demonstrated by numerical simulations for the control of both single and multi-degree of freedom systems subjected to seismic actions. Numerical results have shown that the control algorithm is efficient in reducing the response of building structures, with small amount of required control forces.
https://jacm.scu.ac.ir/article_12603_02691cf2e5c89215537440ffb3db1b38.pdf
2017-04-01
25
36
10.22055/jacm.2017.12603
Structural control
Pole placement
Structural Dynamics
Earthquake Engineering
Nikos
Pnevmatikos
pnevma@teiath.gr
1
Technological Educational Institute of Athens
Department of Civil Engineering
LEAD_AUTHOR
[1] Yao JTP. ‘Concepts of structural control.’ Journal of structural engineering, ASCE; Vol. 98, pp.1567-1574, 1972.
1
[2] Yang J. N., Kim J. H., Agrawal A. K. ‘Resetting semi-active stiffness damper for seismic response control.’ Journal of structural engineering, vol.126, pp.1427-143, 2000.
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[3] Yang J., Agrawal A., ‘Semi-active hybrid control systems for non-linear buildings against near-field earthquakes’, Engineering structures, vol.24, pp.271-280, 2002.
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[4] Yang J.N. ‘Application of optimal control theory to civil engineering structures.’ Journal of Engineering Mechanics Division ASCE, pp.819-838, 1975.
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[5] Yang J.N., Wu J.C. Li Z. ‘Control of seismic excited buildings using active variable stiffness.’ Engineering structures, vol.18, pp.589-596, 1996.
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[6] Yang J.N., Wu J.C., Agrawal A.K., Hsu S.Y. ‘Sliding mode control for non linear and hysteretic structures.’ Journal of Engineering Mechanics, ASCE, vol.121, pp.1330-1339, 1995.
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[7] Yang J.N., Wu J.C., Agrawal A.K., Hsu S.Y. ‘Sliding mode control of seismically excited linear structures.’ Journal of Engineering Mechanics, ASCE, vol121, pp.1386-1390, 1995.
7
[8] Soong T.T. Active structural control: Theory and practice, London/New York: Longman Scientific &Technical/Wiley, 1990.
8
[9] Housner, G. W., Bergman, L. A., Caughey, T. K., Chassiakos, A. G., Claus, R. O., Masri, S. F., Skelton, R. E., Soong, T. T., Spencer, Jr., B. F., and Yao, J. T. P. ‘Structural control: Past, present and future.’ Journal of Engineering Mechanics, vol.123, pp.897–971, 1997.
9
[10] Spencer B.F., Dyke S.J., Sain M.K., Carlson J.D., “Phenomenological model for magnetorheological dampers.” Journal of engineering mechanics, vol.123, pp.230-238, 1997.
10
[11] Spencer Jr., B.F. and Nagarajaiah, S., “State of the Art of Structural Control,” Journal of Structural Engineering, ASCE, Vol. 239, pp.845-56, 2003.
11
[12] Symans MD, Constantinou MC. ‘Seismic testing of a building structure with semi-active fluid damper control system.’ Earthquake Engineering and Structural Dynamics, vol.26, pp.759–777, 1997.
12
[13] Symans MD, Constantinou MC., ‘Semi-active control systems for seismic protection of structures: a state-of-the-art review.’ Engineering Structures, vol.21, pp.469–487, 1999.
13
[14] Symans MD, Kelly SW. ‘Fuzzy logic control of bridge structures using intelligent semiactive seismic isolation systems.’ Earthquake Engineering and Structural Dynamics, vol.28, pp.37–60, 1999.
14
[15] Kobori T., “Experimental study on active variable stiffness system-active seismic response controlled structure,’ Proc. 4th World Congr. Council on Tall Buildings and Urban Habitat, pp.561-572, 1990.
15
[16] Kobori T., and Kamagata, “Dynamic intelligent building -Active seismic response control”, Intelligent structures, Elsiever, vol.2, pp.279-274, 1992.
16
[17] Lu J., Skelton R. ‘Covariance control using closed-loop modeling for structures.’ Earthquake Engineering and Structural Dynamics, vol.27, pp.1367–1383, 1998.
17
[18] Kurata N. and Kobori T. ‘Reliability of applied semi-active structural control system.’ Journal of Structural Engineering,vol.129, pp.914-921, 2003.
18
[19] Reigles Damon G. and Symans Michael D. ‘Supervisory fuzzy control of a base-isolated benchmark building utilizing a neuro-fuzzy model of controllable fluid viscous dampers.’ Structural Control and Health Monitoring, vol.13, pp.724–747, 2006.
19
[20] Renzi E. Serino G. ‘Testing and modeling a semi-actively controlled steel frame structure equipped with MR dampers.’ Structural Control Health Monitoring, vol.11, pp.189–221, 2004.
20
[21] Sage A. P. and White C. C. Optimum systems control. 2nd edition Prentice Hall, Englewood Cliffs NJ, 1977.
21
[22] Kwakernaak H. and Sivan R. Linear optimal control systems. Wiley, New York NY, 1972.
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[23] Brogan W. L. ‘Application of determinant identity to pole-Assignment and observer problems.’ IEEE Transactions on automatic control AC-19, pp.689-692, 1974.
23
[24] Ogata K. Discrete time control systems. Prentice Hall International Inc, 1995.
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[25] Ogata K. Modern control engineering. 3rd edition Prentice Hall International Inc, 1997.
25
[26] Kwon WH, Pearson AE. ‘Feedback Stabilization of linear systems with delayed control.’ IEEE Trans automat Control; AC -25, pp266-269, 1980.
26
[27] Kautsky, J. and Nichols N.K. ‘Robust Pole Assignment in Linear State Feedback.’ International Journal Control, vol.41, pp.1129-1155, 1985.
27
[28] Laub, A.J. and Wette M. Algorithms and Software for Pole Assignment and Observers. UCRL-15646 Rev. 1, EE Dept., Univ. of Calif., Santa Barbara, C., 1984.
28
[29] Leipholz H.H.E. and M. Abdel-Rohman, Control of Structures, Martinus Nijhoff Publishers/Boston, 1986.
29
[30] Martin R. C. and Soong T. T. ‘Modal control of multistory structures.’ ASCE Journal of engineering mechanics, vol.102, pp.613- 623, 1976.
30
[31] Wang P. C., Kozin F. and Amini F. ‘Vibration control of tall buildings’, Engineering Structures, vol.5, pp.282-289, 1983.
31
[32] Meirovotch L. Dynamics and control of structures. John Willey & Sons, 1990.
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[33] Utku S. Theory of adaptive structures: Incorporative intelligent into engineering products. CRC press LLC, 1998.
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[34] Preumont A. Vibration control of active structures; An introduction. 2nd edition Kluwer academic publishers, 2002.
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[35] Nikos G. Pnevmatikos, Charis J. Gantes, “Control strategy for mitigating the response of structures subjected to earthquake actions”, Engineering Structures, Vol. 32, pp. 3616–3628, 2010.
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[36] Shampine L.F. and Thompson S. ‘Solving DDEs in MATLAB.’ Applied Numerical Mathematics, vol.37, pp.441-458, 2001.
36
[37] Cai G.P, Huang J.Z. and Yang S.X. ‘An optimal control method for linear systems with time delay’ Computers and structures, vol.81, pp.1539-1546, 2003.
37
ORIGINAL_ARTICLE
Modeling of heat generations for different tool profiles in friction stir welding: study of tool geometry and contact conditions
In this work, improved heat generation models are developed for straight and tapered shoulder geometries with different tool pin profiles in friction stir welding. The models are developed considering the welding process as a combination of the pure sliding and the pure sticking conditions. From the results, the amount of heat generation is directly proportional to the number of edges in the pin profiles in such a way that the heat generated in the profiles increases from the triangular pin profile to hexagonal pin profile. Also, increase in the tool rotational speed under constant weld speed increases the heat input while increase in the weld speed under constant tool rotational speed decreases the heat input and the rate of heat generation at the shoulder in a flat shoulder tool is more than that of conical/tapered shoulder tool. The predicted results show good agreements with the experimental results in literature.
https://jacm.scu.ac.ir/article_12619_77a53f70dc91efa4317d4ffba8fe8575.pdf
2017-04-01
37
59
10.22055/jacm.2017.12619
Frictional stir welding
Heat generation models
Different Profiles
Tool geometry
Contact Conditions
Akindoye
Waheed
lawrence@unilag.edu.ng
1
Federal University of Agriculture, Abeokuka, Ogun, Nigeria
AUTHOR
Lawrence
Jayesimi
ljayesimi@unilag.edu.ng
2
University of Lagos
LEAD_AUTHOR
M.
Ismaila
ismailasa@yahoo.com
3
Federal University of Agriculture, Abeokuka, Ogun, Nigeria
AUTHOR
U
Dairo
ustev@yahoo.com
4
Federal University of Agriculture, Abeokuka, Ogun, Nigeria
AUTHOR
Thomas W M, Nicholas E D, Needham J C, Murch M G, Temple-Smith P and Dawes C J (1991), Friction-Stir ButtWelding, GB Patent No. 9125978.8, International Patent Application No. PCT/ GB92/02203.
1
Schneider J. Temperature distribution and resulting metal flow, friction stir welding and processing, ASM International, Chapter 3, pp. 37–50, 2007
2
Schneider J. A. Temperature Distribution and Resulting Metal Flow. In: Mishra RS, Mahoney MW, editors. Friction Stir Welding and Processing. Materials Park, OH (USA): ASM International; pp. 71-110, 2007
3
Schneider J, Beshears R, Nunes Jr. AC. Interfacial Sticking and Slipping in the Friction Stir Welding Process. Mat SciEng A. Vol. 435 – 436, pp. 297 – 304, 2006
4
Chao, Y. J. Qi, X. Tang, W. Heat transfer in friction stir welding: experimental and numerical studies, ASME J. Manuf. Sci. Eng. 125, 138–145, 2003.
5
Frigaard, O., Grong, O., and Midling, O. T. A process model for friction stir welding of age hardening aluminium alloys. Metall. Mater. Trans. A. Vol. 32, pp. 1189–1200, 2001.
6
Russell M J and Shercliff H R 1999 1st Int. Symp. on Friction Stir Welding (Thousand Oaks, California, USA)
7
Gadakh, V. S., Kumar, A and Patil J.V. Analytical Modeling of the Friction Stir Welding Process using Different Pin Profiles. Welding Research. Vol. 94(4): pp. 115-124, 2015.
8
Colegrove, P.A., Shercliff, H.R., Zettler, R., A model for predicting the heat generation and temperature in friction stir welding from the material properties. Sci. Technol. Weld. Joining, Vol.12, pp. 284–297, 2007.
9
Djurdjanović, M., et al., Heat Generation During Friction Stir Welding Process, Tribology in Industry, Vol. 31(1-2), pp. 8-14, 2009.
10
Mijajlović, M., and Milčić, D. Analytical model for estimating the amount of heat generated during friction stir welding: Application on plates made of aluminium alloy 2024-T351, pp. 247–274, 2012.
11
Jauhari TK. Development of Multi-Component Device for Load Measurement and Temperature Profile for Friction Stir Welding Process [M.Sc Thesis]. Penang: Universiti Sains Malaysia; Unpublished. 2012.
12
Arora A, Nandan R, Reynolds AP, Debroy T. Torque, power requirement and stir zone geometry in friction stir welding through modeling and experiments. Scripta Mater Vol. 60, pp. 13–16, 2009.
13
El-Tayeb NSM, Low KO, Brevern PV. On the surface and tribological characteristics of burnished cylindrical Al-6061. Tribol. Int Vol. 42, pp. 320–326, 2009.
14
Devaraju A, Kumar A, Kotiveerachari B. Influence of addition of Grp/Al2O3p with SiCp on wear properties of aluminum alloy 6061-T6 hybrid composites via friction stir processing. Trans Nonferrous Met Soc China, Vol. 23, pp. 1275–1280, 2013.
15
Sheppard T. and D. Wright D. Determination of flow stress. Part 1 constitutive equation for aluminum alloys at elevated temperatures, Met. Technol., Vol. 6, pp. 215–223, 1979.
16
Sheppard, T., A Jackson . “Constitutive equations for use in prediction of flow stress during extrusion of aluminium alloys”, Materials Science and Technology, Vol 13(3), pp. 203–209.
17
Uyyuru RK, Kallas SV. Numerical analysis of friction stirs welding process. J Mater Eng Perform 15:505–18, 2006.
18
Colegrove, P.A., Shercliff, H.R.. CFD Modelling of the friction stir welding of thick Plate 7449 aluminium alloy. Sci. Technol. Weld. Joining Vol. 11 (4), pp. 429–441, 2006.
19
Wang H, Colegrove PA, Dos Santos JF. Numerical investigation of the tool contact condition during friction stir welding of aerospace aluminium alloy. Comput Mater Sci.; Vol. 7, pp. 101–108, 2013.
20
Su H, Wu C, Chen M. Analysis of material flow and heat transfer in friction stir welding of aluminium alloys. China Weld (Engl Ed), Vol. 22, pp. 6–10, 2013.
21
Sobamowo, M. G. New models for the prediction of temperature-strain dependent flow stress during machining and fabrication of material. Report on Improved models for flow stress predictions. Unpublished Work, 2016.
22
Schmidt, H., Hattel, J., and Wert, J. An analytical model for the heat generation in friction stir welding. Modelling Simul. Mater. Sci. Eng. Vol. 12: 143–157, 2004.
23
Khandkar, M. Z. H., Khan, J. A., and Reynolds, A. P. Prediction to temperature distribution and thermal history during friction stir welding: Input torque basedmodel. Sci. Technol. Weld. Join. Vol. 8, pp. 165–174, 2003.
24
Ramanjaneyulu, K., Reddy, G. M., Venugopal, A. V. and Markandeya, R. Structure-Property Correlation of AA2014 Friction Stir Welds: Role of Tool Pin Profile. Journal of Materials Engineering and Performance, Vol. 22(8), pp. 2013-2225, 2013.
25
ORIGINAL_ARTICLE
Thermo-mechanical nonlinear vibration analysis of fluid-conveying structures subjected to different boundary conditions using Galerkin-Newton-Harmonic balancing method
The development of mathematical models for describing the dynamic behaviours of fluid conveying pipes, micro-pipes and nanotubes under the influence of some thermo-mechanical parameters results into nonlinear equations that are very difficult to solve analytically. In cases where the exact analytical solutions are presented either in implicit or explicit forms, high skills and rigorous mathematical analyses were employed. It is noted that such solutions do not provide general exact solutions. Inevitably, comparatively simple, flexible yet accurate and practicable solutions are required for the analyses of these structures. Therefore, in this study, approximate analytical solutions are provided to the nonlinear equations arising in flow-induced vibration of pipes, micro-pipes and nanotubes using Galerkin-Newton-Harmonic Method (GNHM). The developed approximate analytical solutions are shown to be valid for both small and large amplitude oscillations. The accuracies and explicitness of these solutions were examined in limiting cases to establish the suitability of the method.
https://jacm.scu.ac.ir/article_12620_6407eabdfb48feaf4cc820081ed07876.pdf
2017-04-01
60
79
10.22055/jacm.2017.12620
Thermo-mechanical
Non-linear vibration
Galerkin’s method
Newton-Harmonic Balancing Technique
Fluid-conveying structure
Gbeminiyi
Sobamowo
mikegbeminiyi@gmail.com
1
UNIVERSITY OF LAGOS
LEAD_AUTHOR
Bayo
Ogunmola
bayemi@yahoo.com
2
University of Lagos, Nigeria.
AUTHOR
Charles
Osheku
gsobamowo@unilag.edu.ng
3
Centre for Space Transport and Propulsion, National Space Research and Development Agency, Federal Ministry of Science and Technology, FCT, Abuja, Nigeria.
AUTHOR
[1] Iijima, S. Nature, London, Vol. 354, pp. 56(1991), 56–58.
1
[2] Benjamin. T. B. Dynamics of a system of articulated pipes conveying fluid. I. Theory. Proc R Soc A Vol. 261:pp. 487–99, 1961.
2
[3] Holmes, P. J. Pipe Supported at Both Ends cannot Flutter. Journal of Applied Mechanics. Vol. 45, pp. 669-672, 1978
3
[4] Housner, G. W., Dodds, H. L. and Runyan. H. Effect of High Velocity Fluid Flow in the Bending Vibration and Static Divergence of Simply Supported Pipes. National Aeronautics and Space Administration Report NASA TN D- 2870, June 1965.
4
[5] Naguleswaran, S. and Williams, C. J. H., Lateral Vibration of a Pipe Conveying Fluid. Journal of Mechanical Engineering Science.Vol. 10, pp. 228- 238, 1968.
5
[6] Paidoussis, M. P., Dynamics of Flexible Slender Cylinders in Axial Flow. Journal of Fluid Mechanics. Vol. 26, pp. 717-736, 1966
6
[7] Paidoussis, M. P. and Deksnis, E. B. Articulated Models of Cantilevers Conveying Fluid: the Study of Paradox. The Journal of Mechanical Engineering Science. Vol. 12, pp. 288-300, 1970.
7
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ORIGINAL_ARTICLE
A DWT and SVM based method for rolling element bearing fault diagnosis and its comparison with Artificial Neural Networks
A classification technique using Support Vector Machine (SVM) classifier for detection of rolling element bearing fault is presented here. The SVM was fed from features that were extracted from of vibration signals obtained from experimental setup consisting of rotating driveline that was mounted on rolling element bearings which were run in normal and with artificially faults induced conditions. The time-domain vibration signals were divided into 40 segments and simple features such as peaks in time domain and spectrum along with statistical features such as standard deviation, skewness, kurtosis etc. were extracted. Effectiveness of SVM classifier was compared with the performance of Artificial Neural Network (ANN) classifier and it was found that the performance of SVM classifier is superior to that of ANN. The effect of pre-processing of the vibration signal by Discreet Wavelet Transform (DWT) prior to feature extraction is also studied and it is shown that pre-processing of vibration signal with DWT enhances the effectiveness of both ANN and SVM classifiers. It has been demonstrated from experiment results that performance of SVM classifier is better than ANN in detection of bearing condition and pre-processing the vibration signal with DWT improves the performance of SVM classifier.
https://jacm.scu.ac.ir/article_12739_beeff8f4820a36f3f892fa38cec5f8fa.pdf
2017-04-10
80
91
10.22055/jacm.2017.21576.1108
Artificial Neural Network (ANN)
Discreet Wavelet Transform (DWT)
Fault Diagnosis
Rolling Element Bearing
Support Vector Machine (SVM)
Sunil
Tyagi
suniltyagi@tyagination.com
1
Defence Institute of Advanced Technology
LEAD_AUTHOR
S. K.
Panigrahi
panigrahi.sk@gmail.com
2
Defence Institute of Advanced Technology Girinagar, Pune - 411025, India
AUTHOR
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