Accession Number : AD1016128


Title :   Development of Thermally Actuated, High-Temperature Composite Morphing Concepts


Descriptive Note : Technical Report,01 Feb 2014,01 Feb 2016


Corporate Author : University of Bristol Bristol United Kingdom


Personal Author(s) : Weaver,Paul


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1016128.pdf


Report Date : 11 May 2016


Pagination or Media Count : 105


Abstract : A thermal bimorph is a thin laminate which develops curvature upon heating on account of being constructed from layers of mismatched thermal expansion coefficients. However, current bimorphs are generally limited to benign temperatures and linear temperature displacement relationships. This work develops modelling techniques and fabrication methods that facilitate the use of nonlinear-response thermal bimorphs in high-temperature morphing structures. Successful application of this work may yield morphing hot structures in extreme environments. A particularly appealing set of applications exists in gas turbine engines, which stand to benefit greatly from aerodynamic control in their combustors, turbines, and nozzles. The overarching goal of this project was to develop the techniques and understanding necessary to fabricate high-temperature, thermally actuated morphing structures that operate with a tailored, nonlinear response to temperature change; that is, actuators whose displacement can be either concentrated at a triggering temperature, or spread out over a given temperature range.


Descriptors :   Thermal management , ceramic matrix composites , metal matrix composites , composite material fabrication , materials processing , material degradation processes , bimetals , dielectric gases , fabrication , high temperature


Distribution Statement : APPROVED FOR PUBLIC RELEASE