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Title: 3D printed hierarchical honeycombs with shape integrity under large compressive deformations

Journal Article · · Materials & Design
ORCiD logo [1];  [2];  [2];  [3];  [4]; ORCiD logo [2]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States). Transportation and Hydrogen Systems Center; State Univ. of New York (SUNY), Stony Brook, NY (United States). Dept. of Mechanical Engineering
  2. State Univ. of New York (SUNY), Stony Brook, NY (United States). Dept. of Mechanical Engineering
  3. Univ. of Bristol, Bristol (United Kingdom). Bristol Composites Inst. (ACCIS)
  4. Lamar Univ., Beaumont, TX (United States). Dept. of Mechanical Engineering

Here, we describe the in-plane compressive performance of a new type of hierarchical cellular structure created by replacing cell walls in regular honeycombs with triangular lattice configurations. The fabrication of this relatively complex material architecture with size features spanning from micrometer to centimeter is facilitated by the availability of commercial 3D printers. We apply to these hierarchical honeycombs a thermal treatment that facilitates the shape preservation and structural integrity of the structures under large compressive loading. The proposed hierarchical honeycombs exhibit a progressive failure mode, along with improved stiffness and energy absorption under uniaxial compression. High energy dissipation and shape integrity at large imposed strains (up to 60%) have also been observed in these hierarchical honeycombs under cyclic loading. Experimental and numerical studies suggest that these anomalous mechanical behaviors are attributed to the introduction of a structural hierarchy, intrinsically controlled by the cell wall slenderness of the triangular lattice and by the shape memory effect induced by the thermal and mechanical compressive treatment.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE; National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1407465
Alternate ID(s):
OSTI ID: 23096641
Report Number(s):
NREL/JA--5400-70441
Journal Information:
Materials & Design, Journal Name: Materials & Design Journal Issue: C Vol. 137; ISSN 0264-1275
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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