In-plane dynamic impact mechanical properties of novel bi-directional hierarchical honeycomb

Abstract

A novel bi-directional hierarchical honeycomb is proposed. A finite element numerical model was constructed using Abaqus/Explicit, the model's accuracy was verified, and a series of in-plane impact studies were carried out. Firstly, the mechanical properties of axial impact were analyzed for different bi-directional hierarchical honeycombs. The results show that the mechanical properties of NBHH-h1h22h3-III and NBHH-h1h2h3h4-IV are the best and almost identical. Subsequently, the mechanical properties of NBHH-XhxYhy-IIs with different layers were analyzed. Research results show that NBHH-h33h4-II has a 77.96 % increase in specific energy absorption (SEA) compared to NBHH-h13h2-II, and NBHH-h13h2-II has a 116.02 % increase in SEA compared to NBHH-3h1h2-II. A parametric study of NBHHs was conducted. The mechanical properties of NBHHs with different layer ratio coefficients were analyzed, and it was found that the mechanical properties of NBHHs with l2 = 12 and k = 0.2 are the best. Finally, the effects of wall thickness and velocity on NBHHs were analyzed. Increasing the wall thickness appropriately can effectively improve the impact resistance of the structure. Bi-directional hierarchical design provides a practical reference for enhancing the in-plane mechanical properties of honeycombs.