Deflection of a hyperbolic shear deformable microbeam under a concentrated load

Document Type : Research Paper

Authors

1 Akdeniz University Civil Eng. Dept.

2 Civil Engineering Dept.

Abstract

Deflection analysis of a simply supported microbeam subjected to a concentrated load at the middle is investigated on the basis of a shear deformable beam theory and non-classical theory. Effects of shear deformation and small size are taken into consideration by hyperbolic shear deformable beam theory and modified strain gradient theory, respectively. The governing differential equations and corresponding boundary conditions are obtained by implementing minimum total potential energy principle. Navier-type solution is employed to achieve an analytical solution for deflections of simply supported homogeneous microbeams. The effects of shear deformation, material length scale parameter and slenderness ratio on the bending response of microbeams are investigated in detail.

Keywords

Main Subjects

References
[1]            Younis, M.I., Abdel-Rahman, E.M., Nayfeh, A.H., “A reduced-order model for electrically actuated microbeam-based MEMS”, Journal of Microelectromechanical Systems, Vol. 12, pp. 672–680, 2003.
[2]            Li, P., Fang, Y., “A molecular dynamics simulation approach for the squeeze-film damping of MEMS devices in the free molecular regime”, Journal of Micromechanics and Microengineering, Vol. 20, 035005, 2010.
[3]            Wu, Z.Y., Yang, H., Li, X.X., Wang, Y.L., “Self-assembly and transfer of photoresist suspended over trenches for microbeam fabrication in MEMS”, Journal of Micromechanics and Microengineering, Vol. 20, 115014, 2010.
[4]            Zook, J.D., Burns, D.W., Guckel, H., Sniegowski, J.J., Engelstad, R.L., Feng, Z., “Characteristics of polysilicon resonant microbeams”, Sensors and Actuators A: Physics, Vol. 35, pp. 51–59, 1992.
[5]            Torii, A., Sasaki, M., Hane, K., Okuma, S., “Adhesive force distribution on microstructures investigated by an atomic force microscope”, Sensors and Actuators A: Physics, Vol. 44, pp. 153–158, 1994.
[6]            Hung, E.S., Senturia, S.D., “Extending the travel range of analog-tuned electrostatic actuators”, Journal of Microelectromechanical Systems, Vol. 8, pp. 497–505, 1999.
[7]            Acquaviva, D., Arun, A., Smajda, R., Grogg, D., Magrez, A., Skotnicki, T., Ionescu, A.M., “Micro-Electro-Mechanical Switch Based on Suspended Horizontal Dense Mat of CNTs by FIB Nanomanipulation”, Procedia Chemistry, Vol. 1, pp. 1411–1414, 2009.
[8]            Poole, W.J., Ashby, M.F., Fleck, N.A., “Micro-hardness of annealed and work- hardened copper polycrystals”,  Scripta Materialia, Vol. 34, pp. 559–564, 1996.
[9]            Stölken, J.S., Evans, A.G., “A microbend test method for measuring the plasticity length scale”, Acta Materialia, Vol. 46, pp. 5109–5115, 1998.
[10]         Lam, D.C.C., Yang, F., Chong, A.C.M., Wang, J., Tong, P., “Experiments and theory in strain gradient elasticity”, Journal of the  Mechanics and Physisc of Solids, Vol. 51, pp. 1477–1508, 2003.
[11]         McFarland, A.W., Colton, J.S., “Role of material microstructure in plate stiffness with relevance to microcantilever sensors”, Journal of Micromechanics and Microengineering, Vol. 15, pp. 1060–1067, 2005.
[12]         Mindlin, R.D., Tiersten, H.F., “Effects of couple-stresses in linear elasticity”, Archive for Rational Mechanics and Analysis, Vol. 11, pp. 415–448, 1962.
[13]         Koiter, W.T., “Couple stresses in the theory of elasticity: I and II”, Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen (B), Vol. 67, pp. 17–44, 1964.
[14]         Toupin, R.A., “Theory of elasticity with couple stresses”, Archive for Rational Mechanics and Analysis, Vol. 17, pp. 85–112, 1964.
[15]         Eringen, A.C., “Theory of micropolar plates”. Zeitschrift für angewandte Mathematik und Physik, Vol. 18, pp. 12–30, 1967.
[16]         Eringen, A.C., “Nonlocal polar elastic continua”, International Journal of Engineering Science, Vol. 10, pp. 1–16, 1972.
[17]         Eringen, A.C., “On differential equations of nonlocal elasticity and solutions of screw dislocation and surface waves”, Journal of Applied Physics, Vol. 54, pp. 4703–4710, 1983.
[18]         Fleck, N.A., Hutchinson, J.W., “A phenomenological theory for strain gradient effects in plasticity”, Journal of the Mechanics and Physics of Solids, Vol. 41, pp. 1825–1857, 1993.
[19]         Vardoulakis, I., Sulem, J., “Bifurcation Analysis in Geomechanics”. Blackie/Chapman and Hall, London, 1995.
[20]         Aifantis, E.C., “Gradient deformation models at nano, micro, and macro scales”, Journal of Engineering Materials and Technology, Vol. 121, pp. 189–202, 1999.
[21]         Fleck, N.A., Hutchinson, J.W., “A reformulation of strain gradient plasticity”, Journal of the Mechanics and Physics of Solids, Vol. 49, pp. 2245–2271, 2001.
[22]         Akgöz, B., Civalek, Ö., “Longitudinal vibration analysis for microbars based on strain gradient elasticity theory”, Journal of Vibration and Control, Vol. 20, pp. 606–616, 2001.
[23]         Akgöz, B., Civalek, Ö., “Longitudinal vibration analysis of strain gradient bars made of functionally graded materials (FGM)”, Composites Part B, Vol. 55, pp. 263–268, 2013.
[24]          Kahrobaiyan, M.H., Asghari, M., Ahmadian, M.T., “Longitudinal behavior of strain gradient bars”, International Journal of Engineering Science, Vol. 66–67, pp. 44–59, 2013.
[25]         Kahrobaiyan, M.H., Tajalli, S.A., Movahhedy, M.R., Akbari, J., Ahmadian, M.T., “Torsion of strain gradient bars”, International Journal of Engineering Science, Vol. 49, pp. 856–866, 2011.
[26]          Kong, S., Zhou, S., Nie, Z., Wang, K., “Static and dynamic analysis of micro beams based on strain gradient elasticity theory”, International Journal of Engineering Science, Vol. 47, pp. 487–498, 2009.
[27]         Wang, B., Zhao, J., Zhou, S., “A micro scale Timoshenko beam model based on strain gradient elasticity theory”, European Journal of Mechanics A/Solids, Vol. 29, pp. 591–599, 2010.
[28]         Akgöz, B., Civalek, Ö., “Strain gradient elasticity and modified couple stress models for buckling analysis of axially loaded micro-scaled beams”, International Journal of Engineering Science, Vol. 49, pp. 1268–1280, 2011.
[29]         Akgöz, B., Civalek, Ö., “Analysis of micro-sized beams for various boundary conditions based on the strain gradient elasticity theory”, Archive of Applied Mechanics, Vol. 82, pp. 423–443, 2012.
[30]         Akgöz, B., Civalek, Ö., “Buckling analysis of linearly tapered micro-columns based on strain gradient elasticity”, Structural Engineering and Mechanics, Vol. 48, pp. 195–205, 2013.
[31]         Asghari, M., Kahrobaiyan, M.H., Nikfar, M., Ahmadian, M.T., “A size-dependent nonlinear Timoshenko microbeam model based on the strain gradient theory”, Acta Mechanica, Vol. 223, 1233–1249, 2012.
[32]          Ghayesh, M.H., Amabili, M., Farokhi, H., “Nonlinear forced vibrations of a microbeam based on the strain gradient elasticity theory”, International Journal of Engineering Science, Vol. 63, pp. 52–60, 2013.
[33]         Kahrobaiyan, M.H., Asghari, M., Ahmadian, M.T., “Strain gradient beam element”, Finite Element Analysis in Design, Vol. 68, pp. 63–75, 2013.
[34]         Zhang, B., He, Y., Liu, D., Gan, Z., Shen, L., “Non-classical Timoshenko beam element based on the strain gradient elasticity theory”, Finite Element Analysis in Design, Vol. 79, pp. 22–39, 2014.
[35]         Mercan, K., Civalek, Ö., “DSC method for buckling analysis of boron nitride nanotube (BNNT) surrounded by an elastic matrix”, Composite Structures, Vol. 143, pp. 300–309, 2016.
[36]         Demir, Ç., Civalek, Ö., “Torsional and longitudinal frequency and wave response of microtubules based on the nonlocal continuum and nonlocal discrete models”, Applied Mathematical Modelling, Vol. 37, pp. 9355–9367, 2013.
[37]         Levinson, M., “A new rectangular beam theory”, Journal of Sound and Vibration, Vol. 74, pp. 81–87, 1981.
[38]         Reddy, J.N., “A simple higher-order theory for laminated composite plates”, Journal of Applied Mechanics, Vol. 51, pp. 745–752, 1984. 
[39]         Touratier, M., “An efficient standard plate theory”, International Journal of Engineering Science, Vol. 29, pp. 901–916, 1991.
[40]         Soldatos, K.P., “A transverse shear deformation theory for homogeneous monoclinic plates”, Acta Mechanica, Vol. 94, pp. 195–220, 1992.
[41]         Karama, M., Afaq, K.S., Mistou, S., “Mechanical behaviour of laminated composite beam by the new multi-layered laminated composite structures model with transverse shear stress continuity”, International Journal of Solids and Structures, Vol. 40, pp. 1525–1546, 2003.
[42]         Aydogdu, M., “A new shear deformation theory for laminated composite plates”, Composite Structures, Vol. 89, pp. 94–101, 2009.
[43]         Nateghi, A., Salamat-talab, M., Rezapour, J., Daneshian, B., “Size dependent buckling analysis of functionally graded micro beams based on modified couple stress theory”, Applied Mathematical Modelling, Vol. 36, pp. 4971–4987, 2012.
[44]         Salamat-talab, M., Nateghi, A., Torabi, J., “Static and dynamic analysis of third-order shear deformation FG micro beam based on modified couple stress theory”, International Journal of Mechanical Sciences, Vol. 57, pp. 63–73, 2012.
[45]         Akgöz, B., Civalek, Ö., “A size-dependent shear deformation beam model based on the strain gradient elasticity theory”, International Journal of Engineering Science, Vol. 70, pp. 1–14, 2013.
[46]         Lei, J., He, Y., Zhang, B., Gan, Z., Zeng, P., “Bending and vibration of functionally graded sinusoidal microbeams based on the strain gradient elasticity theory”, International Journal of Engineering Science, Vol. 72, pp. 36–52, 2013.
[47]         Şimşek, M., Reddy, J.N., “Bending and vibration of functionally graded microbeams using a new higher order beam theory and the modified couple stress theory”, International Journal of Engineering Science, Vol. 64, pp. 37–53, 2013.
[48]         Şimşek, M., Reddy, J.N., “A unified higher order beam theory for buckling of a functionally graded microbeam embedded in elastic medium using modified couple stress theory”, Composite Structures, 101, pp. 47–58, 2013.
[49]         Akgöz, B., Civalek, Ö., “A new trigonometric beam model for buckling of strain gradient microbeams”, International Journal of Mechanical Sciences, Vol. 57, pp. 88–94, 2014.
[50]         Akgöz, B., Civalek, Ö., “Shear deformation beam models for functionally graded microbeams with new shear correction factors”, Composite Structures, Vol. 112, pp. 214–225, 2014.
[51]         Akgöz, B., Civalek, Ö., “Thermo-mechanical buckling behavior of functionally graded microbeams embedded in elastic medium”. International Journal of Engineering Science, Vol. 85, pp. 90–104, 2014.
[52]         Darijani, H., Mohammadabadi, H., “A new deformation beam theory for static and dynamic analysis of microbeams”, International Journal of Mechanical Sciences, Vol. 89, pp. 31–39, 2014.
[53]         Akgöz, B., Civalek, Ö., “A microstructure-dependent sinusoidal plate model based on the strain gradient elasticity theory”, Acta Mechanica, Vol. 226, pp. 2277–2294, 2015.
[54]         Akgöz, B., Civalek, Ö., “A novel microstructure-dependent shear deformable beam model”, International Journal of Mechanical Sciences, Vol. 99, pp. 10–20, 2015.
[55]         Akgöz, B., Civalek, Ö., “Bending analysis of FG microbeams resting on Winkler elastic foundation via strain gradient elasticity”, Composite Structures, Vol. 134, pp. 294–301, 2015.
[56]         Zhang, B., He, Y., Liu, D., Gan, Z., Shen, L., “Size-dependent functionally graded beam model based on an improved third-order shear deformation theory”, European Journal of Mechanics-A/Solids, Vol. 47, pp. 211–230, 2014.