Energy dissipation mechanisms in hollow metallic microlattices

When properly designed at ultra-low density, hollow metallic microlattices can fully recover from compressive strains in excess of 50%, while dissipating a considerable portion of the elastic strain energy. This article investigates the physical mechanisms responsible for energy loss upon compressiv...

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Bibliographic Details
Published in:Journal of materials research 2014-08, Vol.29 (16), p.1755-1770
Main Authors: Salari-Sharif, Ladan, Schaedler, Tobias A., Valdevit, Lorenzo
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Bars
Biomaterials
Compressive properties
Constraining
Cycles
Damping
Deformation
Density
Design optimization
Dissipation
Energy dissipation
Fractures
Inorganic Chemistry
Materials Engineering
Materials research
Materials Science
Nanotechnology
Strain
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Summary:When properly designed at ultra-low density, hollow metallic microlattices can fully recover from compressive strains in excess of 50%, while dissipating a considerable portion of the elastic strain energy. This article investigates the physical mechanisms responsible for energy loss upon compressive cycling, and attributes the most significant contribution to a unique form of structural damping, whereby elastic local buckling of individual bars releases energy upon loading. Subsequently, a simple mechanical model is presented to capture the relationship between lattice geometry and structural damping. The model is used to optimize the microlattice geometry for maximum damping performance. The conclusions show that hollow metallic microlattices exhibit exceptionally large values of the damping figure of merit, (Young's modulus)1/3(loss coefficient)/(density), but this performance requires very low relative densities (
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2014.226