Tailoring for strength of composite steered-fibre panels with cutouts |
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| Authors: | CS Lopes Z Gürdal PP Camanho |
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| Affiliation: | 1. INEGI – Instituto de Engenharia Mecânica e Gestão Industrial, Rua Dr. Roberto Frias 400, 4200-465 Porto, Portugal;2. Faculteit Luchtvaart- en Ruimtevaarttechniek, Technische Universiteit Delft, Kluyverweg 1, 2629 HS Delft, The Netherlands;3. DEMec, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias 400, 4200-465 Porto, Portugal;1. AMADE, Department of Mechanical Engineering and Industrial Construction, Universitat de Girona, Campus Montilivi s/n, 17071 Girona, Spain;2. IMDEA Materials—Madrid Institute for Advanced Studies of Materials, c/Eric Kandel, Parque Científico y Tecnológico—Tecnogetafe, 28906 Getafe, Madrid, Spain;3. INEGI – Instituto de Engenharia Mecânica e Gestão Industrial, Rua Dr. Roberto Frias, 400, 4200-465 Porto, Portugal;1. AMADE, Polytechnic School, Universitat de Girona, Campus Montilivi s/n, 17071 Girona, Spain;2. IMDEA Materials - Madrid Institute for Advanced Studies of Materials, c/Eric Kandel, 2, Parque Científico y Tecnológico-Tecnogetafe, 28906 Getafe, Madrid, Spain |
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| Abstract: | A large number of composite parts include cutouts to accommodate windows, doors, and bolted joints. These regions are hot-spots in terms of design because they concentrate stresses, hence becoming critical in terms of the structural integrity of the part.A traditional approach to the problem of stress concentrations around cutouts is to locally increase the laminate thickness in order to improve the strength margins. Often this practice attracts more loads to the cutout besides increasing part weight. A more effective solution is to tailor the panel in-plane stiffness by means of fibre-steered laminates, and avoid the stress concentrations altogether.The present research demonstrates that it is possible to design and manufacture composite panels whose buckling and first-ply failure responses are insensitive to the existence of a central hole. Moreover, it is shown that the structural performance of these designs more than doubles that of straight-fibre configurations. |
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