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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.
Scientific Reports
|June 21, 2016
Summary
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.
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.
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