Study on the Energy Absorption Capacity of Foam-Filled Thin-Walled Tubes with Polygon Cross-Sections under Torsional Loading
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Abstract
This investigation aimed to study the energy absorption capacity of thin-walled tubes with polygon cross-sections under torsional loading. The tube cross-sections included square, hexagonal, octagonal, decagonal, icosagonal, hexacontagonal, octacontagonal, and circular shapes. Foam densities of 50, 100, 150, 200, and 250 kg/m³ were considered. The analysis was conducted using experimental and finite element methods.The analysis results concluded that the relationship of the torsional moment-angle curves from the finite element agreed well with experimental results and has an average percentage error is 8.31%. Then, the result of foam densities was found that increasing the foam densities at 0 kg/m3(empty tube) to 100 kg/m3 increase the energy absorption capacity of foam-filled polygon tubes. After that, when the foam density exceeds 100 kg/m³, the energy absorption capacity tends to reach a saturation state (the energy absorption capacity exhibits minimal variation). Furthermore, the result of the polygonal shapes was found that the octagonal, decagonal, icosagonal, hexacontagonal, octacontagonal, and circle tube exhibit the highest and comparable levels of energy absorption capacity. This is followed by the hexagonal tube and the energy absorption capacity of the square tube is the lowest.
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