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Abstract
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Honeycomb is considered an ideal structural material because of its high strength and shear stiffness, high impact strength, lower weight, excellent energy absorbing property, high crushing stress, and almost constant crushing force. In this study, 3D woven honeycomb structures were developed with different cell geometry by varying the cell size, free wall length, bonded wall length, opening angle, and the number of honeycomb layers keeping overall composite thickness constant. The variation of cell geometry was carried out by changing the number of picks in the honeycomb wall. E-glass tows of 600 tex were used to produce fabric samples. All the constituent walls have the same construction and are woven with 2D plain fabric. Composite samples were made from the honeycomb fabric with epoxy resin (matrix) using VARIM (vacuum-assisted resin infusion method) process. Flatwise compressive properties were determined for different cell geometry and the number of layers of honeycomb. It was discovered that structural characteristics had an impact on compression energy absorption. The results revealed that regular honeycomb, smaller cell sizes, and more layers show higher specific energy absorption. These findings are useful in the development and application of 3D honeycomb composite.
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