Impact behavior of negative stiffness honeycomb materials

Negative stiffness honeycombs are architected metamaterials that utilize elastic buckling to absorb mechanical energy. Relative to conventional honeycomb materials, they offer several advantages, including the ability to recover their initial configuration and offer consistently repeatable mechanica...

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Bibliographic Details
Published in:Journal of materials research 2018-02, Vol.33 (3), p.290-299
Main Authors: Debeau, David A., Seepersad, Carolyn C., Haberman, Michael R.
Format: Article
Language:English
Subjects:
Additive manufacturing
Aluminum
Applied and Technical Physics
Biomaterials
Boundary conditions
Design
Elastic buckling
Energy
Energy absorption
Geometry
Honeycomb construction
Impact loads
Impact tests
Inorganic Chemistry
Invited Article
Invited Articles
Laser sintering
Materials Engineering
Materials research
Materials Science
Mechanical properties
Metamaterials
Nanotechnology
Rapid prototyping
Stiffness
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Summary:Negative stiffness honeycombs are architected metamaterials that utilize elastic buckling to absorb mechanical energy. Relative to conventional honeycomb materials, they offer several advantages, including the ability to recover their initial configuration and offer consistently repeatable mechanical energy absorption. In this paper, fully recoverable negative stiffness honeycombs are fabricated from thermoplastic and metallic parent materials. The honeycombs are subjected to quasistatic and impact loading to demonstrate the predictability and repeatability of their energy absorption characteristics across a variety of loading conditions. Results indicate that these honeycombs offer nearly ideal shock isolation by thresholding the acceleration of an isolated mass at a predetermined level and that this thresholding behavior is highly repeatable as long as the magnitude of the mechanical energy imparted to the system does not exceed the energy absorption capacity of the honeycomb.
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2018.7