NDLI: Thermal Actuation Through Bimaterial Lattices

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Marina, M. Toropova Craig, A. Steeves
Copyright Year	2015
Abstract	The goal of this study is to examine the theoretical capability of bimaterial lattices as thermally driven actuators. The lattices are composed of planar non-identical cells. Each cell consists of a skewed hexagon surrounding an irregular triangle; the skew angles of the hexagon and the ratio of the coefficients of thermal expansion (CTEs) of the two component materials determine the overall performance of the actuator. Such a cell has three tailorable CTEs along the lines connecting the points where adjoining cells are connected. Each individual cell and a lattice consisting of such cells can be strongly anisotropic in terms of thermal expansion. While these lattice cells have been used as stress-free connectors for components with differing CTEs, they have not been explored for their actuation capacity. This paper develops models for bimaterial lattices that can be used as mechanical actuators for valves, switches and differential motion. A general procedure for lattice design includes drawing of its skeleton, which identifies the points at which a lattice cell is connected to other cells or substrates; calculation of three CTEs in each cell depending upon the functionality desired; choosing lattice materials; and finding of the skew angles for each cell as solutions of three nonlinear algebraic equations. By changing materials and geometry, we can determine the change of their configuration when the temperature changes. This paper illustrates the concepts with several examples: a two-cell lattice that is connected to a substrate that functions as a lever in a switch; a three-cell lattice that serves as a valve; and a lattice that controls the maximum total deflection of two adjoining parts of a structure.
Sponsorship	Aerospace Division
File Format	PDF
ISBN	9780791857298
DOI	10.1115/SMASIS2015-8855
Volume Number	Volume 1: Development and Characterization of Multifunctional Materials; Mechanics and Behavior of Active Materials; Modeling, Simulation and Control of Adaptive Systems
Conference Proceedings	ASME 2015 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
Language	English
Publisher Date	2015-09-21
Publisher Place	Colorado Springs, Colorado, USA
Access Restriction	Subscribed
Subject Keyword	Design Geometry Actuators Thermal expansion Temperature Algebra Deflection Anisotropy Switches Valves Stress Levers
Content Type	Text
Resource Type	Article

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