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The mechanical buckling behaviour of composite sandwich structure made from hybrid glass/carbon face sheets and rigid foam core
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The mechanical buckling behaviour of composite sandwich structure made from hybrid glass/carbon face sheets and rigid foam core
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Dissertation
The mechanical buckling behaviour of composite sandwich structure made from hybrid glass/carbon face sheets and rigid foam core
2016
Overview
The occurrence of a hybrid effect for sandwich panels made from inter-laminar hybrid composite face sheets and a rigid foam core with respect to buckling performance was the subject of investigation in this study. As a first step, this study performed experiments and validated the results using analytical predictions and numerical simulations. Second, a comprehensive comparison of the experimental, analytical and numerical results was used to confirm the occurrence of a hybrid effect, which was the study's major objective. Experimentally, all the sandwich panels were fabricated using the Vacuum Assisted Resin Transfer Molding (VARTM) process by double infusing the resin through the sandwich panel face sheets simultaneously. A set of compressive tests were performed to optimize the dimensions of the buckling test specimens that delivered the most clear and recordable out-of-plane deflection using non-contact laser sensors. Additionally, flexural 3-point bending tests were performed to investigate the existence of a hybrid effect within the six hybrid specimens made from 2:2 hybrid (glass:carbon) fiber face sheets and to study their ability to delay the yield and ultimate loading points. The hybrid specimen results were compared to two baseline specimens made from sandwich panels with all-glass or all-carbon face sheets. The chances of face sheet failure were higher when the carbon fiber layers were placed at or near the outer side of the face sheet lamina during the bending tests. Moreover, the best flexural performance was delivered by the specimens with balanced face sheets. Finally, the buckling behavior of the six different sandwich panels were investigated compared to the two baseline sandwich panels. The out-of-plane deflection of each specimen was measured by back-to-back reflex non-contact laser sensors to capture the negative and positive deflections on both sides of the specimen. The experimental buckling results showed a positive hybrid effect in the hybrid specimen with an alternating order of glass and carbon lay-up in delaying the critical buckling load by 11.4% to 18.3%. A microscopic examination was performed to investigate the failure modes and their mechanisms caused by both the flexural 3-point bending tests and the buckling tests.
Publisher
ProQuest Dissertations & Theses
Subject
ISBN
9798209587590
