An analytical assessment of the influence of skin imperfections on the indentation collapse mechanism in composite sandwich beams |
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| Affiliation: | 1. Key Laboratory of Wind Energy Utilization, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100190, China;3. National Laboratory of Wind Turbine Blade Research & Development Center, Beijing 100190, China;4. Department of Wind Energy, Technical University of Denmark, Frederiksborgvei 399, 4000 Roskilde, Denmark;1. School of Mathematics and Statistics, University of Glasgow, G12 8QW, UK;2. Mathematical Institute, University of Oxford, OX2 6GG, UK;3. Officio Kft., Toberek utca 5, 1112 Budapest, Hungary;1. European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU), P.O. Box 2340, 76125 Karlsruhe, Germany;2. DSO National Laboratories, 20 Science Park Drive, 118230 Singapore;3. Department of Mathematical Sciences and Technology, Norwegian University of Life Sciences, P.O. Box 5003 NO−1432 Aas, Norway |
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| Abstract: | The influence of skin imperfections, in the form of delamination damage or thickness variations, on the indentation collapse mechanism in composite sandwich beams with compressive yielding cores is studied using the models of non-prismatic beam and beam-column resting on a nonlinear Winkler foundation. Upper and lower threshold solutions are derived for the indentation response and collapse load and the transition between the two limits is defined as a function of size, magnitude and position of the imperfections. In beams where global bending effects are not negligible, the collapse load is limited from above by the indentation collapse load of beams with rigid-plastic cores and the face wrinkling collapse load of beams with elastic cores; the transition between the two limits is controlled by material/structure properties and the magnitude of the imperfections. Characteristic lengths, which depend on material and geometrical properties, define the minimum size of the imperfections with the strongest effect on the solution and the minimum distance between load and imperfections with no effect on the solution. |
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