Associate Laboratory of  Energy, Transports and Aeronautics

Funder

Organizational Unit

Publications

Multiscale stress analysis in CFRC using microscope image data of carbon fibres

Publication . Graça, R. J. R.; Rodrigues, José Alberto; Loja, Amélia; Jorge, Pedro

Composite materials, are known as strong candidates to improve different kinds of structures. The micromechanical study of these materials is very important, because it may define the best composite characteristics to be used and/or predict more accurately its response. In the present work a multi-stage procedure comprising different fibre contour modelling strategies and a sequent hierarchic multiscale analysis is performed. With this study it is intended to achieve a more realistic characterization of the stresses maximum values for a set of case studies, through the use of fibre geometry data obtained from microscope images of carbon fibre laminated composites. The theoretical circular cross-section is also considered to enable a comparative study among the different situations.

2017Journal article

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Multiobjective design of viscoelastic laminated composite sandwich panels

Publication . Madeira, JFA; Araújo, A. L.; Mota Soares, C. M.; Mota Soares, C. A.; Ferreira, A. J. M.

The optimal design of laminated sandwich panels with viscoelastic core is addressed in this paper, with the objective of simultaneously minimizing weight and material cost and maximizing modal damping. The design variables are the number of layers in the laminated sandwich panel, the layer constituent materials and orientation angles and the viscoelastic layer thickness. The problem is solved using the Direct MultiSearch (DMS) solver for multiobjective optimization problems which does not use any derivatives of the objective functions. A finite element model for sandwich plates with transversely compressible viscoelastic core and anisotropic laminated face layers is used. Trade-off Pareto optimal fronts are obtained and the results are analyzed and discussed.

2015-08Journal article

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