Deformation and energy absorption of composite egg-box panels |
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| Affiliation: | 1. School of Mechanical Engineering, Chung-Ang University 221, Huksuk-Dong, Dongjak-Ku, Seoul 156-756, Republic of Korea;2. Department of Engineering, Cambridge University, Trumpington Street, Cambridge CB2 1PZ, UK;1. School of Naval Architecture and Ocean Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China;2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration (CISSE), Shanghai 200240, PR China;1. Plant Biomechanics Group Freiburg, Botanic Garden, Faculty of Biology, University of Freiburg, Schänzlestraße 1, 79104 Freiburg, Germany;3. Competence Network Biomimetics, Schänzlestraße 1, 79104 Freiburg, Germany;1. Sichuan Co-Innovation Center for New Energetic Materials, Southwest University of Science and Technology (SWUST), Mianyang 621010, PR China;2. Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), Mianyang 621900, PR China;1. School of Mechanical Engineering, Chung-Ang University, Seoul 06974, Republic of Korea;2. Institute of Gas Safety R&D, Korea Gas Safety Corporation, Chungcheongbuk-do 28443, Republic of Korea |
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| Abstract: | Static compressive tests of composite egg-box panels, whose stacking sequences and number of plies were controlled, were carried out to investigate their deformation behaviour and energy absorption capacity. Silicon rubber moulds were first moulded from an aluminium egg-box panel template. These moulds were in turn used to fabricate composite specimens. Two fabric prepregs, carbon/epoxy plain weave fabric and glass/epoxy 4-harness satin weave were draped over the rubber mould with various stacking angles. The specimens were cured in an autoclave using vacuum bag degassing moulding and an appropriate cure cycle. The nominal stress–strain relations of the specimens were compared and multiply-interrupted compressive tests were used to identify fracture initiation and development. The energy absorption per unit mass of composite egg-box panels were compared with that of an aluminium egg-box panel. From the test results it was concluded that the compressive behaviour of the composite structure is affected by the local stacking sequence of the fabrics and by shear deformation during initial lay-up and draping. By considering the stress–stain behaviour, energy absorption and material cost, the optimal material and draping condition were proposed for a composite egg-box panel. |
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