Dynamic Behavior of Engineered Lattice Materials.
Additive manufacturing (AM) is enabling the fabrication of materials with engineered lattice structures at the micron scale. These mesoscopic structures fall between the length scale associated with the organization of atoms and the scale at which macroscopic structures are constructed. Dynamic compression experiments were performed to study the emergence of behavior owing to the lattice periodicity in AM materials on length scales that approach a single unit cell. For the lattice structures, both bend and stretch dominated, elastic deflection of the structure was observed ahead of the compaction of the lattice, while no elastic deformation was observed to precede the compaction in a stochastic, random structure. The material showed lattice characteristics in the elastic response of the material, while the compaction was consistent with a model for compression of porous media. The experimental observations made on arrays of 4 × 4 × 6 lattice unit cells show excellent agreement with elastic wave velocity calculations for an infinite periodic lattice, as determined by Bloch wave analysis, and finite element simulations.
Lawrence Livermore National Laboratory, Livermore, CA 94550 USA.|Institute for Shock Physics, Washington State University, Pullman, WA 99164 USA.
J A
JA
Hawreliak
Lawrence Livermore National Laboratory, Livermore, CA 94550 USA.
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J
Lind
Lawrence Livermore National Laboratory, Livermore, CA 94550 USA.
B
B
Maddox
Lawrence Livermore National Laboratory, Livermore, CA 94550 USA.
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M
Barham
Lawrence Livermore National Laboratory, Livermore, CA 94550 USA.
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Messner
Lawrence Livermore National Laboratory, Livermore, CA 94550 USA.
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Barton
Los Alamos National Laboratory, Los Alamos, NM 87545 USA.
B J
BJ
Jensen
Lawrence Livermore National Laboratory, Livermore, CA 94550 USA.
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Kumar