Abstract
This paper investigates the effect of changing the interior angle of a hexagonal passive energy absorber. 5052 aluminum alloy hexagonal rings with various interior angles were designed, fabricated, and tested under an in-plane quasi-static compression test to study the effect of the angle on the crushing behavior and the energy absorption capability. The results showed that the rings with angles 40° and 45° achieved a stable crushing behavior with about 100% crushing force efficiency and low initial peak force. Thus, hexagonal rings with these angles have a high potential to be used in the vehicle's crumple zones to absorb energy during collisions. However, the bigger interior angles required a much higher initial peak force to initiate the crushing, which indicates that these structures are best suited in applications where high load carrying capacity is needed.
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