Journal
EXPERIMENTAL MECHANICS
Volume 53, Issue 9, Pages 1735-1742Publisher
SPRINGER
DOI: 10.1007/s11340-013-9748-z
Keywords
Low thermal expansion; Thermally stable; Tunable CTE; Metastructures; bi-metallic array
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Funding
- Keck Institute for Space Studies at the California Institute of Technology
- National Aeronautics and Space Administration
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We design, fabricate, and test thin thermally stable metastructures consisting of bi-metallic unit cells and show how the coefficient of thermal expansion (CTE) of these metastructures can be finely and coarsely tuned by varying the CTE of the constituent materials and the unit cell geometry. Planar and three-dimensional finite element method modeling (FEM) is used to drive our design and inform experiments, and predict the response of these metastructures. We develop a robust experimental fabrication procedure in order to fabricate thermally stable samples with high aspect ratios. We use digital image correlation (DIC) and an infrared camera to experimentally measure displacement and temperature during testing and compute the CTE of our samples. The samples, composed of an aluminum core and an external titanium frame, exhibit a CTE of 2.6 ppm/A degrees C, which is significantly lower than either constituent. These unit cells can be assembled over a large area to create thin low-CTE foils. Finally, we demonstrate how the approach developed in this work can be used to fabricate metastructures with CTE's ranging from -3.6 ppm/A degrees C to 8.4 ppm/A degrees C.
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