Abstract The aim of the paper is to investigate active shape control of post-buckled elastic beams subjected to in-plane compressive loadings using surface-bonded shape memory alloy (SMA) layer actuators. A robust macroscopic SMA model is used to simulate main features of the SMA layer under dominant axial and transverse shear stresses during non-proportional thermo-mechanical loadings. The SMA model is able to reproduce martensite transformation/orientation, pseudo-elasticity, shape memory effect and in particular reorientation of martensite and ferro-elasticity effects. Non-linear equations of equilibrium for the moderately thick smart beam are derived by means of the principle of minimum total potential energy based on the first-order shear deformation theory and von Kármán geometrical non-linearity. The governing equations of equilibrium are solved using Ritz based finite element method along with an iterative numerical algorithm. Effects of the pre-strain state, thickness and temperature of the SMA layer actuator are examined, and their implications upon the pre/post-buckling behavior of the smart beam under in-plane compressive loadings are highlighted. The obtained results reveal that installing the SMA layer actuator can play a significant beneficial role toward confining deformation of the smart structure in the post-buckling regime. Due to lack of similar results in the specialized literature, the results of this research are expected to contribute to a better understanding of active shape control capability of the SMA composite beams under in-plane mechanical loadings.


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    Title :

    Shape control of shape memory alloy composite beams in the post-buckling regime


    Contributors:
    Damanpack, A.R. (author) / Bodaghi, M. (author) / Aghdam, M.M. (author) / Shakeri, M. (author)

    Published in:

    Publication date :

    2014-06-10


    Size :

    13 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English