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.
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Notes
The astute reader will notice positive acceleration at the beginning of the time history plot in Fig. 4(d), caused by friction and drag forces exerted on the falling block.
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ACKNOWLEDGMENTS
The authors wish to thank Dr. Desiderio Kovar and Dr. Sergio Cortes for their generous assistance with the quasistatic compression tests reported in Figs. 1(b) and 3 and Nicholas Leathe, Audrey Morris-Eckart, and Tommy Woodall of Sandia National Laboratories for helpful feedback on testing and applications. The authors gratefully acknowledge financial support from the National Science Foundation under Grant No. CMMI-1435548 and the Laboratory Directed Research and Development (LDRD) program at Sandia National Laboratories. Sandia National Laboratories is a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA-0003525. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the sponsor.
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End Note
a. The astute reader will notice positive acceleration at the beginning of the time history plot in Fig. 4(d), caused by friction and drag forces exerted on the falling block.
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Debeau, D.A., Seepersad, C.C. & Haberman, M.R. Impact behavior of negative stiffness honeycomb materials. Journal of Materials Research 33, 290–299 (2018). https://doi.org/10.1557/jmr.2018.7
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DOI: https://doi.org/10.1557/jmr.2018.7