Polytope Sector-Based Synthesis and Analysis of Microstructural Architectures With Tunable Thermal Conductivity and Expansion
Author(s)
Hopkins, Jonathan B.; Song, Yuanping; Lee, Howon; Spadaccini, Christopher M.; Fang, Xuanlai
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The aim of this paper is to (1) introduce an approach, called polytope sector-based synthesis (PSS), for synthesizing 2D or 3D microstructural architectures that exhibit a desired bulk-property directionality (e.g., isotropic, cubic, orthotropic, etc.), and (2) provide general analytical methods that can be used to rapidly optimize the geometric parameters of these architectures such that they achieve a desired combination of bulk thermal conductivity and thermal expansion properties. Although the methods introduced can be applied to general beam-based microstructural architectures, we demonstrate their utility in the context of an architecture that can be tuned to achieve a large range of extreme thermal expansion coefficients—positive, zero, and negative. The material-property-combination region that can be achieved by this architecture is determined within an Ashby-material-property plot of thermal expansion versus thermal conductivity using the analytical methods introduced. These methods are verified using finite-element analysis (FEA) and both 2D and 3D versions of the design have been fabricated using projection microstereolithography.
Date issued
2016-03Department
Massachusetts Institute of Technology. Department of Mechanical EngineeringJournal
Journal of Mechanical Design
Publisher
ASME International
Citation
Hopkins, Jonathan B. et al. “Polytope Sector-Based Synthesis and Analysis of Microstructural Architectures With Tunable Thermal Conductivity and Expansion.” Journal of Mechanical Design 138.5 (2016): 051401. © 2016 ASME
Version: Final published version
ISSN
1050-0472