Free vibration analysis and design optimization of SMA/Graphite/Epoxy composite shells in thermal environments

Salim, M., Bodaghi, M. ORCID: 0000-0002-0707-944X, Kamarian, S. and Shakeri, M., 2018. Free vibration analysis and design optimization of SMA/Graphite/Epoxy composite shells in thermal environments. Latin American Journal of Solids and Structures, 15 (1): e10. ISSN 1679-7817

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Abstract

Composite shells, which are being widely used in engineering applications, are often under thermal loads. Thermal loads usually bring thermal stresses in the structure which can significantly affect its static and dynamic behaviors. One of the possible solutions for this matter is embedding Shape Memory Alloy (SMA) wires into the structure. In the present study, thermal buckling and free vibration of laminated composite cylindrical shells reinforced by SMA wires are analyzed. Brinson model is implemented to predict the thermo-mechanical behavior of SMA wires. The natural frequencies and buckling temperatures of the structure are obtained by employing Generalized Differential Quadrature (GDQ) method. GDQ is a powerful numerical approach which can solve partial differential equations. A comparative study is carried out to show the accuracy and efficiency of the applied numerical method for both free vibration and buckling analysis of composite shells in thermal environment. A parametric study is also provided to indicate the effects of like SMA volume fraction, dependency of material properties on temperature, lay-up orientation, and pre-strain of SMA wires on the natural frequency and buckling of Shape Memory Alloy Hybrid Composite (SMAHC) cylindrical shells. Results represent the fact that SMAs can play a significant role in thermal vibration of composite shells. The second goal of present work is optimization of SMAHC cylindrical shells in order to maximize the fundamental frequency parameter at a certain temperature. To this end, an eight-layer composite shell with four SMA-reinforced layers is considered for optimization. The primary optimization variables are the values of SMA angles in the four layers. Since the optimization process is complicated and time consuming, Genetic Algorithm (GA) is performed to obtain the orientations of SMA layers to maximize the first natural frequency of structure. The optimization results show that using an optimum stacking sequence for SMAHC shells can increase the fundamental frequency of the structure by a considerable amount.

Item Type: Journal article
Publication Title: Latin American Journal of Solids and Structures
Creators: Salim, M., Bodaghi, M., Kamarian, S. and Shakeri, M.
Publisher: Brazilian Association of Computational Mechanics
Date: 1 March 2018
Volume: 15
Number: 1
ISSN: 1679-7817
Identifiers:
NumberType
10.1590/1679-78253070DOI
S1679-78252018000100509Publisher Item Identifier
Rights: This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Divisions: Schools > School of Science and Technology
Depositing User: Jonathan Gallacher
Date Added: 21 Dec 2018 09:47
Last Modified: 21 Dec 2018 09:47
URI: http://irep.ntu.ac.uk/id/eprint/35414

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