Collapse load of composite laminates: Lower bound evaluation by stress field analytical approximation |
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| Affiliation: | 1. Laboratoire de Génie Civil, Ecole Nationale d’Ingénieurs de Tunis, University of Tunis El Manar, BP 37, 1002 le Belvédeère, Tunis, Tunisia;2. Department PAU, University Mediterranea of Reggio Calabria, Via Melissari, I-89124 Reggio Calabria, Italy;1. Department of Mechanical Engineering, The University of Sheffield, Sir Frederick Mappin Building, Mappin Street, S1 3JD Sheffield, United Kingdom;2. Escuela Técnica Superior de Ingenieros Industriales de Ciudad Real, Universidad de Castilla-La Mancha, Departamento de Mecánica Aplicada e Ingeniería de Proyectos, INEI Avenida Camilo José Cela s/n, 13071 Ciudad Real, Spain;1. Department of Bridge Engineering, Tongji University, Shanghai, China;2. Department of Civil and Environment Engineering, University of California, Irvine, CA, USA;3. School of Civil Engineering, Changsha University of Science & Technology, Hunan, China;4. Department of Civil and Environment Engineering, Rice University, TX, USA |
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| Abstract: | The paper proposes a limit analysis approach to define the ultimate load capacity of orthotropic composite laminates under biaxial loading and plane stress conditions. A lower bound to the collapse load multiplier is computed by solving a maximization nonlinear problem, according to the static theorem of limit analysis. To set up the optimization problem a stress field distribution is hypothesized at lamina level, moreover inter-lamina stresses are also considered. The effectiveness and validity of the proposed approach is shown by comparing the obtained numerical predictions both with available experimental data and with other numerical results carried out by means of a different numerical lower bound approach. |
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| Keywords: | A Laminates B Anisotropy C Numerical analysis Nonlinear optimization |
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