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Indirect Fabrication of Lattice Metals with Thin Sections Using Centrifugal Casting
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Dynamic Behavior of Engineered Lattice Materials.

J A Hawreliak1,2, J Lind1, B Maddox1

  • 1Lawrence Livermore National Laboratory, Livermore, CA 94550 USA.

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Summary
This summary is machine-generated.

Engineered lattice structures in additive manufacturing exhibit unique elastic behavior due to their periodicity. This contrasts with random structures, revealing distinct dynamic compression responses at the microscale.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Physics

Background:

  • Additive manufacturing (AM) allows for the creation of materials with precisely engineered lattice structures at the micron scale.
  • These mesoscopic structures bridge atomic and macroscopic length scales.
  • Understanding the behavior of these structures under dynamic loading is crucial for advanced material design.

Purpose of the Study:

  • To investigate the dynamic compression behavior of additively manufactured lattice structures.
  • To explore the influence of lattice periodicity on material response at the unit cell level.
  • To compare the behavior of periodic lattices with stochastic, random structures.

Main Methods:

  • Dynamic compression experiments were conducted on microscale lattice structures.
  • Behavior was analyzed at length scales approaching a single unit cell.
  • Results were compared with models for porous media compression and elastic wave velocity calculations.

Main Results:

  • Periodic lattice structures showed elastic deflection (bend and stretch dominated) before lattice compaction.
  • Stochastic structures did not exhibit elastic deformation preceding compaction.
  • Experimental data closely matched Bloch wave analysis and finite element simulations for infinite periodic lattices.

Conclusions:

  • The elastic response of AM materials is influenced by lattice characteristics and periodicity.
  • Compaction behavior aligns with models for porous media.
  • The study validates theoretical models for periodic structures using experimental dynamic compression data.