A novel honeycomb structure with arc walls inserted into the concave hexagonal
honeycomb cells (RHWAI) is proposed. Parameter analysis is conducted through
numerical calculations, revealing that as the cell angle increases, the peak force initially
decreases and subsequently increases, with a minimum peak force observed at a cell angle
of 60,
and the plateau force gradually decreases, while energy absorption initially decreases and
then fluctuates within a certain range. As the wall thickness increases, the peak force,
plateau force, and energy absorption also increase continuously. With increasing of
parameter
,
the peak force decreases continuously, the plateau force first increases and then
decreases, and the energy absorption gradually decreases. After that, the
newly designed honeycomb structure is applied to the bumper absorbing box
and is compared with traditional reentrant honeycomb-filled and unfilled
energy-absorbing boxes. The results indicate that after filling with the RHWAI
honeycomb, the intrusive displacement of the bumper is reduced, and its
energy absorption capacity is enhanced. Notably, the bumper filled with the
RHWAI honeycomb exhibits a total energy absorption capacity that exceeds
that of an unfilled honeycomb box by over 300%. The RHWAI honeycomb
demonstrates the highest specific energy absorption (SEA) and strongest
energy absorption capacity. A thorough analysis of the deformation and
performance of energy-absorbing boxes at different impact velocities shows that
while the energy absorption of the bumper does increase with higher impact
velocities, the magnitude of this increase remains relatively modest. The
design of the trigger and the honeycomb filling of the energy absorbing box
improve the protection performance of the energy absorbing box. These
insightful research findings offer novel perspectives for enhancing impact
protection.
Keywords
auxetic honeycomb, energy absorption, energy absorbing box