Topological study about deformation behavior and energy absorption performances of 3D chiral structures under dynamic impacts

The dynamic deformation behavior and energy absorption characteristics of the 3D chiral structures were analyzed by the explicit dynamics analysis module of ANSYS/LS-DYNA. The 3D chiral structure arrayed with different micro-cell parameters cells are established. The respective influences of impact velocities, rotation angles, number and diameter of beams on the deformation behaviors, the dynamic plateau stresses, the absorbed energy, and crush stress efficiency (CSE) are explored in detail. It is shown that the 3D chiral structure exhibits torsional effect and has better energy absorption properties under low-speed impact. At high speed impact, the 3D chiral structure is affected by the impact reinforcement. This leads to a segmentation characteristic between plateau stress and impact velocity for 3D chiral structures. For the given impact velocity, the dynamic plateau stresses are related to the number and diameter of beam by a power law and a quadratic curves, respectively. The results of this study provide scientific guidance and technical support for the optimization and effective design of 3D chiral structures.