NDLI: Adjustable membrane mirrors incorporating g-elastomers

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Adjustable membrane mirrors incorporating g-elastomers

Content Provider	NASA Technical Reports Server (NTRS)
Author	Yang, Eui-Hyeok Chang, Zensheu Su, Ji Hishinuma, Yoshikazu Xu, Tian-Bing Morgan, Rhonda M.
Copyright Year	2008
Description	Lightweight, flexible, large-aperture mirrors of a type being developed for use in outer space have unimorph structures that enable precise adjustment of their surface figures. A mirror of this type includes a reflective membrane layer bonded with an electrostrictive grafted elastomer (G-elastomer) layer, plus electrodes suitably positioned with respect to these layers. By virtue of the electrostrictive effect, an electric field applied to the G-elastomer membrane induces a strain along the membrane and thus causes a deflection of the mirror surface. Utilizing this effect, the mirror surface figure can be adjusted locally by individually addressing pairs of electrodes. G-elastomers, which were developed at NASA Langley Research Center, were chosen for this development in preference to other electroactive polymers partly because they offer superior electromechanical performance. Whereas other electroactive polymers offer, variously, large strains with low moduli of elasticity or small strains with high moduli of elasticity, G-elastomers offer both large strains (as large as 4 percent) and high moduli of elasticity (about 580 MPa). In addition, G-elastomer layers can be made by standard melt pressing or room-temperature solution casting.
File Size	80571
Page Count	1
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20080047183
Archival Resource Key	ark:/13960/t0ms8px92
Language	English
Publisher Date	2008-11-01
Access Restriction	Open
Subject Keyword	Electroactive Polymers Membranes Electromechanics Elastomers Modulus of Elasticity Electrostriction Mirrors Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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