Energy absorption performance of the auxetic arc-curved honeycomb with thickness and arc angle gradient based on additive manufacturing

Auxetic arc-curved honeycomb has attracted extensive attention due to its lower stress concentration level. The energy absorption capacity of the arc-curved honeycomb can be further enhanced by the gradient design. In this paper, on the basis of the auxetic arc-curved honeycomb, thickness gradient honeycombs and arc angle gradient honeycombs are designed. The effects of different gradient configurations on the energy absorption of auxetic arc-curved honeycomb are discussed. The finite element model verified by experiments is used to study the compression behavior. The results show that the specific energy absorption of the gradient honeycombs increased by 11.0 % and 16.8 %, respectively. Compared with the uniform honeycomb, when the wall thickness is arranged alternately between layers and the arc angle decreases from both sides to the middle. This work systematically studies the effects of different gradient configurations on the deformation mode and energy absorption capacity of auxetic arc-curved honeycomb, which can provide guidance for the design of gradient honeycomb.