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Open AccessArticle

Variable Stiffness Composites: Optimal Design Studies

1
CIMOSM, ISEL, Centro de Investigação em Modelação e Optimização de Sistemas Multifuncionais, 1959-007 Lisboa, Portugal
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Universidade de Évora, 7000-671 Évora, Portugal
3
IDMEC, IST—Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
*
Author to whom correspondence should be addressed.
J. Compos. Sci. 2020, 4(2), 80; https://doi.org/10.3390/jcs4020080
Received: 24 May 2020 / Revised: 19 June 2020 / Accepted: 20 June 2020 / Published: 24 June 2020
(This article belongs to the Special Issue Feature Papers in Journal of Composites Science in 2020)
This research work has two main objectives, being the first related to the characterization of variable stiffness composite plates’ behavior by carrying out a comprehensive set of analyses. The second objective aims at obtaining the optimal fiber paths, hence the characteristic angles associated to its definition, that yield maximum fundamental frequencies, maximum critical buckling loads, or minimum transverse deflections, both for a single ply and for a three-ply variable stiffness composite. To these purposes one considered the use of the first order shear deformation theory in connection to an adaptive single objective method. From the optimization studies performed it was possible to conclude that significant behavior improvements may be achieved by using variable stiffness composites. Hence, for simply supported three-ply laminates which were the cases where a major impact can be observed, it was possible to obtain a maximum transverse deflection decrease of 11.26%, a fundamental frequency increase of 5.61%, and a buckling load increase of 51.13% and 58.01% for the uniaxial and biaxial load respectively. View Full-Text
Keywords: variable stiffness composite plates; first-order shear deformation theory; static; free vibration and static buckling analyses; optimal design variable stiffness composite plates; first-order shear deformation theory; static; free vibration and static buckling analyses; optimal design
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MDPI and ACS Style

Marques, F.E.C.; Mota, A.F.S.; Loja, M.A.R. Variable Stiffness Composites: Optimal Design Studies. J. Compos. Sci. 2020, 4, 80.

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