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

Journal Article · · International Journal of Impact Engineering
 [1];  [2];  [2]
  1. California Institute of Technology (CalTech), Pasadena, CA (United States); Institute for Shock Physics, Washington State University
  2. California Institute of Technology (CalTech), Pasadena, CA (United States)
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 shock compression behavior of stainless steel 316L (SS316L) octet-truss lattice structures was investigated through experimental techniques and numerical simulations. Plate impact experiments with high-speed imaging were conducted at impact velocities of 270 – 390 m/s on lattice specimens with 5x5x10 unit cell geometries additively manufactured (AM) using direct metal laser sintering. High-speed imaging together with digital image correlation was used to extract full-field measurements and define a two-wave structure consisting of an elastic wave and planar compaction (shock) wave which propagated along the impact direction. A linear shock velocity versus particle velocity relation was found to approximate the measurements with a unit slope and a linear fit constant equal to the crushing speed. Furthermore, the shock velocity versus particle velocity relation, full-field measurements, and elastic limit together with the Eulerian form of the Rankine-Hugoniot jump conditions were used to find relations for the stress and internal energy behind the shock. Stress behind the shock increased with relative density and particle velocity, and specific internal energy converged to a single curve similar to that of bulk AM SS316L. Explicit finite element analysis using the Johnson-Cook constitutive model demonstrated similar shock behavior observed in experiments and a linear shock velocity versus particle velocity relation and corresponding Hugoniot calculations were found to be in agreement with experimental results. Numerical simulations confirmed negligible effects of exterior versus interior measurements and further validated the application of one-dimensional shock theory.
Research Organization:
Washington State Univ., Pullman, WA (United States). Inst. for Shock Physics
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)
Grant/Contract Number:
NA0003957
OSTI ID:
1877895
Alternate ID(s):
OSTI ID: 1961714
Journal Information:
International Journal of Impact Engineering, Journal Name: International Journal of Impact Engineering Vol. 169; ISSN 0734-743X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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