Authors: Carlo Alberto Biffi P Bassani A Tuissi M Carnevale N Lecis A LoConte B Previtali
Publish Date: 2012/07/18
Volume: 21, Issue: 12, Pages: 2713-2718
Abstract
Shape memory alloys SMAs are very interesting smart materials not only for their shape memory and superelastic effects but also because of their significant intrinsic damping capacity The latter is exhibited upon martensitic transformations and especially in martensitic state The combination of these SMA properties with the mechanical and the lightweight of fiberglassreinforced polymer FGRP is a promising solution for manufacturing of innovative composites for vibration suppression in structural applications CuZnAl sheets after laser patterning were embedded in a laminated composite between a thick FGRP core and two thin outer layers with the aim of maximizing the damping capacity of the beam for passive vibration suppression The selected SMA Cu66Zn24Al10 at was prepared by vacuum induction melting the ingot was subsequently hotandcold rolled down to 02 mm thickness tape The choice of a copper alloy is related to some advantages in comparison with NiTiCu SMA alloys which was tested for the similar presented application in a previous study lower cost higher storage modulus and consequently higher damping properties in martensitic state The patterning of the SMA sheets was performed by means of a pulsed fiber laser After the laser processing the SMA sheets were heat treated to obtain the desired martensitic state at room temperature The transformation temperatures were measured by differential scanning calorimetry DSC The damping properties were determined at room temperature on fullscale sheet using a universal testing machine MTS with cyclic tensile tests at different deformation amplitudes Damping properties were also determined as a function of the temperature on miniature samples with a dynamical mechanical analyzer DMA Numerical modeling of the laminated composite done with finite element method analysis and modal strain energy approaches was performed to estimate the corresponding total damping capacity and then compared to experimental results
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