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Impact behavior of negative stiffness honeycomb materials

Published online by Cambridge University Press:  14 February 2018

David A. Debeau ,
Carolyn C. Seepersad  and
Michael R. Haberman
David A. Debeau
Affiliation:
Mechanical Engineering Department, The University of Texas at Austin, Austin, Texas 78712, USA
Carolyn C. Seepersad*
Affiliation:
Mechanical Engineering Department, The University of Texas at Austin, Austin, Texas 78712, USA
Michael R. Haberman
Affiliation:
Mechanical Engineering Department, The University of Texas at Austin, Austin, Texas 78712, USA
*
a)Address all correspondence to this author. e-mail: ccseepersad@mail.utexas.edu
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Abstract

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.

Keywords

honeycombnegative stiffnessimpactmetamaterial
Type
Invited Articles
Information
Journal of Materials Research , Volume 33 , Issue 3: Focus Issue: Architected Materials , 14 February 2018 , pp. 290 - 299
Copyright
Copyright © Materials Research Society 2018 

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Footnotes

Contributing Editor: Lorenzo Valdevit

References

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