ABSTRACT
The pentamode lattice ring structure as an impact protection structure can bend the propagation path of the impact stress wave, which is completely different from the mechanism of the traditional impact protection structure. In order to study the regulation effect of the pentamode lattice ring structure on the impact stress wave, a pentamode lattice ring structure test model is designed and made. Through the impact test and simulation, it is found that the peak strain of the inner-ring front shock surface of the pentamode lattice ring structure is 92.5% of that of the inner-ring rear shock surface. Compared with the equal mass solid ring, the peak strain on the inner-ring front shock surface of the pentamode lattice ring structure is reduced by 44%, while the peak strain on the inner-ring rear shock surface is increased by 25%. It is found that the normal vector direction distribution of the dispersion surface isoline can accurately reflect the energy flow characteristics in the material. The relevant conclusions can provide some reference for the application of pentamode materials in the field of impact protection.
