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Architected lattices with adaptive energy absorption

Wang, Yifan and Ramirez, Brian and Carpenter, Kalind and Naify, Christina and Hofmann, Douglas C. and Daraio, Chiara (2019) Architected lattices with adaptive energy absorption. Extreme Mechanics Letters, 33 . Art. No. 100557. ISSN 2352-4316. doi:10.1016/j.eml.2019.100557.

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Energy absorbing materials, like foams used in protective equipment, are able to undergo large deformations under low stresses, reducing the incoming stress wave below an injury or damage threshold. They are typically effective in absorbing energy through plastic deformation or fragmentation. However, existing solutions are passive, only effective against specific threats and they are usually damaged after use. Here, we overcome these limitations designing energy absorbing materials that use architected lattices filled with granular particles. We use architected lattices to take advantage of controlled bending and buckling of members to enhance energy absorption. We actively control the negative pressure level within the lattices, to tune the jamming phase transition of the granular particles, inducing controllable energy absorption and recoverable deformations. Our system shows tunable stiffness and yield strength by over an order of magnitude, and reduces the transmitted impact stress at different levels by up to 40% compared to the passive lattice. The demonstrated adaptive energy absorbing system sees wide potential applications from personal protective equipment, vehicle safety systems to aerospace structures.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Wang, Yifan0000-0001-9965-9777
Carpenter, Kalind0000-0002-1085-9949
Daraio, Chiara0000-0001-5296-4440
Additional Information:© 2019 Published by Elsevier Ltd. Received 12 August 2019, Revised 10 September 2019, Accepted 10 September 2019, Available online 18 September 2019. Y. W and C. D. acknowledge the support from the National Science Foundation under EFRI Grant No. 1741565. This research was carried out at the California Institute of Technology and the Jet Propulsion Laboratory under a contract with the National Aeronautics and Space Administration, and funded through the President’s and Director’s Fund Program. Y. W., B. R. and C. D. designed the experiment. Y. W. and B. R. performed the experiment and analyzed the data. Y. W., B. R. and C. D. wrote the manuscript. All authors interpreted the results and reviewed the manuscript.
Funding AgencyGrant Number
JPL President and Director's FundUNSPECIFIED
Subject Keywords:Energy absorption; Architected materials; Granular jamming
Record Number:CaltechAUTHORS:20190919-124613335
Persistent URL:
Official Citation:Yifan Wang, Brian Ramirez, Kalind Carpenter, Christina Naify, Douglas C. Hofmann, Chiara Daraio, Architected lattices with adaptive energy absorption, Extreme Mechanics Letters, Volume 33, 2019, 100557, ISSN 2352-4316, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98757
Deposited By: Tony Diaz
Deposited On:19 Sep 2019 19:58
Last Modified:16 Nov 2021 17:41

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