A simplified approach to the damage tolerance design of asymmetric tapered laminates. Part I: Methodology development |
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| Authors: | G Allegri MR Wisnom SR Hallett |
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| Affiliation: | 1. Max-Planck-Institute für Physik, München, Germany;2. Neurologie, Uniklinik Freiburg, Freiburg, Germany;1. Department of Engineering Science, University of Oxford, Oxford, UK;2. Advanced Composites Centre for Innovation and Science (ACCIS), University of Bristol, Bristol, UK;3. Rolls-Royce plc, Derby, UK;4. Faculty of Aeronautics, Imperial College of London, London, UK;1. Department of Engineering Science, University of Oxford, Oxford, UK;2. School of Aerospace, Transport and Manufacturing, Cranfield University, Cranfield, UK;3. Advanced Composites Centre for Innovation and Science (ACCIS), University of Bristol, Bristol, UK;4. Faculty of Aeronautics, Imperial College of London, London, UK;1. Shinshu University, 4-17-1, Wakasato, Nagano 380-8553, Japan;2. Graduate School of Shinshu University, 4-17-1, Wakasato, Nagano 380-8553, Japan;3. Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara 252-5258, Japan;4. Kyoto University, Nishikyo-ku, Kyoto 615-8540, Japan;5. University of Padova, Stradella San Nicola 3, 36100 Vicenza, Italy |
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| Abstract: | Tapered composite laminates are susceptible to interlaminar damage in the form of delaminations growing from ply drop-off locations. This study presents an analytical method for the calculation of the energy release rates associated with interlaminar cracks emanating from the ply termination in both the laminate thick and thin sections, also accounting for the effects of the tapering angle. The proposed approach is based on modeling asymmetrically tapered composite laminates as assemblies of layered Euler–Bernoulli beam segments; these are split and reconnected through-the-thickness at the ply-drop-off location. The presence of a local resin pocket is explicitly considered in the model. Orthotropic rescaling is employed in order to take into account the material behavior through-the-thickness. This paper presents the analytical formulation of the proposed approach, whose validation follows in part II. |
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