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This content will become publicly available on February 2, 2019

Title: Hoberman-sphere-inspired lattice metamaterials with tunable negative thermal expansion

Materials with engineered thermal expansion coefficients, capable of avoiding failure or irreversible destruction of structures and devices, are important for aerospace, civil, biomedical, optics, and semiconductor applications. In natural materials, thermal expansion usually cannot be adjusted easily and a negative thermal expansion coefficient is still uncommon. Here we propose a novel architected lattice bi-material system, inspired by the Hoberman sphere, showing a wide range of tunable thermal expansion coefficient from negative to positive, -1.04 x 10 -3 degrees C-1 to 1.0 x 10 -5 degrees C-1. Numerical simulations and analytical formulations are implemented to quantify the evolution of the thermal expansion coefficients and reveal the underlying mechanisms responsible for this unusual behavior. We show that the thermal expansion coefficient of the proposed metamaterials depends on the thermal expansion coefficient ratio and the axial stiffness ratio of the constituent materials, as well as the bending stiffness and the topological arrangement of the constitutive elements. The finding reported here provides a new routine to design architected metamaterial systems with tunable negative thermal expansion for a wide range of potential applications.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [3]
  1. China Three Gorges Univ., Hubei (China); State Univ. of New York (SUNY), Stony Brook, NY (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  3. State Univ. of New York (SUNY), Stony Brook, NY (United States)
  4. China Three Gorges Univ., Hubei (China)
Publication Date:
Report Number(s):
NREL/JA-5400-71054
Journal ID: ISSN 0263-8223
Grant/Contract Number:
AC36-08GO28308
Type:
Accepted Manuscript
Journal Name:
Composite Structures
Additional Journal Information:
Journal Volume: 189; Journal Issue: C; Journal ID: ISSN 0263-8223
Publisher:
Elsevier
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
National Science Foundation (NSF); Region 2 University Transportation Research Center (UTRC); US Department of the Navy, Office of Naval Research (ONR)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; metamaterials; lattice; negative thermal expansion
OSTI Identifier:
1424900