Shock compression behavior of stainless steel 316L octet-truss lattice structures

Lattice structures offer desirable mechanical properties for applications of energy absorption and impact mitigation but limited research has been carried out on their shock compression behavior. In this work, the behavior stainless steel 316L (SS316L) octet-truss lattice was investigated through experimental techniques numerical simulations. Plate experiments with high-speed imaging were conducted at velocities 270–390 m/s specimens 5 × 10 unit cell geometries additively manufactured (AM) using direct metal laser sintering. High-speed together digital image correlation used to extract full-field measurements define a two-wave structure consisting an elastic wave planar compaction (shock) which propagated along direction. A linear velocity versus particle relation found approximate slope fit constant equal crushing speed. The relation, measurements, limit Eulerian form Rankine–Hugoniot jump conditions find relations stress internal behind shock. Stress increased relative density velocity, specific converged single curve similar that bulk AM SS316L. Explicit finite element analysis Johnson–Cook constitutive model demonstrated observed in corresponding Hugoniot calculations be agreement results. Numerical simulations confirmed negligible effects exterior interior further validated application one-dimensional theory.