Analysis of In-Plane Impact Mechanical Properties of Centre-Symmetric Chiral Honeycomb

In this paper, two center-symmetric chiral honeycombs (CSCH-1 and CSCH-2) were designed through a center-symmetric approach. Corresponding samples were prepared using 3D printing technology, and in-plane impacts were carried out under quasi-static experiments with the conventional chiral honeycomb (CH). The experimental results show that CSCH-1 and CSCH-2 have better load-bearing capacity and energy-absorbing properties than CH. The mean stress of the two increased by 40% and 60%, and the energy absorption (EA) increased by 92.10% and 101.90%, respectively, compared to CH. Furthermore, the design of CSCH-2 effectively controls the expansion and deformation of the structure, and shows better negative Poisson's ratio effect. Subsequent finite element modeling was performed using the finite element software Abaqus/Explicit, and the accuracy of the finite element model was verified. Furthermore, the in-plane impact mechanical behavior of CH, CSCH-1, and CSCH-2 was investigated at different impact velocities, various nodal circle radii, and different orthogonal array ratios.