Tailorable thermal expansion hybrid structures

A design concept is presented for a macro or microstructure that combines materials with differing thermal expansion to achieve an overall effective expansion that differs substantially from either of the constituents. Near-zero-CTE and isotropic negative expansion designs are achieved by creating c...

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Bibliographic Details
Published in:International journal of solids and structures 2009-06, Vol.46 (11), p.2372-2387
Main Authors: Jefferson, George, Parthasarathy, Triplicane A., Kerans, Ronald J.
Format: Article
Language:English
Subjects:
Bounds methods
Composite structures
Finite element analysis
Parametric design
Tailorable thermal expansion
Thermoelasticity
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Summary:A design concept is presented for a macro or microstructure that combines materials with differing thermal expansion to achieve an overall effective expansion that differs substantially from either of the constituents. Near-zero-CTE and isotropic negative expansion designs are achieved by creating compliant structures where overall expansion is compensated by internal bending deformation. Such structures have application where dimensional stability is required when subject to large thermal gradients, e.g. space mirrors. In this paper, we present closed form analytic expressions for prediction of the effective expansion, and consequent internal stressing, of the structure, as well as several finite element simulations that demonstrate the design performance under non-uniform thermal load.
ISSN:0020-7683
1879-2146
DOI:10.1016/j.ijsolstr.2009.01.023