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Mechanical characterization of a bonded tailorable coefficient of thermal expansion lattice with near optimal performance

Published online by Cambridge University Press:  26 October 2018

Jonathan B. Berger Open the ORCID record for Jonathan B. Berger [Opens in a new window]  and
Robert M. McMeeking
Jonathan B. Berger*
Affiliation:
Materials Department, University of California, Santa Barbara, California 93106-5050, USA; and Department of Mechanical Engineering, University of California, Santa Barbara, California 93106-5070, USA
Robert M. McMeeking
Affiliation:
Materials Department, University of California, Santa Barbara, California 93106-5050, USA; Department of Mechanical Engineering, University of California, Santa Barbara, California 93106-5070, USA; School of Engineering, King’s College, University of Aberdeen, Aberdeen AB24 3UE, Scotland; and Functional Surfaces Department, INM-Leibniz Institute for New Materials, Saarbrücken 66123, Germany
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Low coefficient of thermal expansion (CTE) lattices occupy a unique area of property space. With such a system, it is possible to achieve relatively high stiffness, with opportunities to combine low thermal expansion and with a range of advantageous properties. Possibilities include combinations that are not rivaled by any bulk material, e.g., low CTE and high melting temperature, and low CTE with low conductivity. One design in particular, the UCSB Lattice, has biaxial stiffness very near theoretical upper bounds when the joints are pinned. Bonded lattices are found to inherit the near optimal performance of the parent pin-jointed design. Despite near optimal performance, however, stiffnesses and strengths are limited to a few percent of the relative property of the constituents. The local deformations necessary to accommodate low net CTE are similar to those of auxetic lattices, with similar behavior, having a low, zero, or negative tunable Poisson’s ratio. An investigative framework, including experiments, finite element, and analytical formulas, is used to construct these assessments.

Keywords

thermal stressesstructuralcellular (material type)
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 20 , 29 October 2018 , pp. 3383 - 3397
Copyright
Copyright © Materials Research Society 2018 

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