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Steel and Composite Structures
  Volume 36, Number 6, September25 2020 , pages 671-687

Bending and buckling analysis of sandwich Reddy beam considering shape memory alloy wires and porosity resting on Vlasov
Mostafa Bamdad, Mehdi Mohammadimehr and Kazem Alambeigi

    The aim of this research is to analyze buckling and bending behavior of a sandwich Reddy beam with porous core and composite face sheets reinforced by boron nitride nanotubes (BNNTs) and shape memory alloy (SMA) wires resting on Vlasov\'s foundation. To this end, first, displacement field\'s equations are written based on the higher-order shear deformation theory (HSDT). And also, to model the SMA wire properties, constitutive equation of Brinson is used. Then, by utilizing the principle of minimum potential energy, the governing equations are derived and also, Navier\'s analytical solution is applied to solve the governing equations of the sandwich beam. The effect of some important parameters such as SMA temperature, the volume fraction of SMA, the coefficient of porosity, different patterns of BNNTs and porous distributions on the behavior of buckling and bending of the sandwich beam are investigated. The obtained results show that when SMA wires are in martensite phase, the maximum deflection of the sandwich beam decreases and the critical buckling load increases significantly. Furthermore, the porosity coefficient plays an important role in the maximum deflection and the critical buckling load. It is concluded that increasing porosity coefficient, regardless of porous distribution, leads to an increase in the critical buckling load and a decrease in the maximum deflection of the sandwich beam.
Key Words
    sandwich beam; Shape memory alloy; Buckling and bending; Porosity; Higher-order shear deformation theory; Vlasov\'s foundation
Mostafa Bamdad, Mehdi Mohammadimehr and Kazem Alambeigi: Department of Solid Mechanics, Faculty of Mechanical Engineering, University of Kashan
P.O Box 87317-53153, Kashan, Iran

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