DYNAMIC PERFORMANCE OF 3D METAL-HOLLOW-SPHERE FOAMS WITH SOFT-HARD SPHERES

3D interleaved metal hollow sphere foams are established by controlling the stiffness of hollow spheres at different lattice points. The dynamic performances of uniform metal hollow sphere foams and mixed ones are investigated comparatively under different impact conditions. The emphasis is placed on the effects of the distribution pattern of soft and hard hollow spheres on the dynamic foam performance. The results show that by controlling the distribution of soft and hard hollow spheres, the stresses in the materials can adjust autonomously according to the impact condition, which results in an enhanced energy absorption efficiency. The 3D soft-hard sphere mixed metal-hollow-sphere foam provides some useful guidance in the adaptive design of metal-hollow-sphere foams.