국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Analyses of Hubble Space Telescope Aluminized-Teflon Insulation Retrieved After 19 Years of Space Exposure
저자	deGroh, Kim K.;; Waters, Deborah L.;; Mohammed, Jelila S.;; Perry, Bruce A.;; Banks, Bruce A.
Keyword	AEROSPACE ENVIRONMENTS;; EMBRITTLEMENT;; HUBBLE SPACE TELESCOPE;; LOW EARTH ORBITS;; MECHANICAL PROPERTIES;; MORPHOLOGY;; MULTILAYER INSULATION;; OPTICAL PROPERTIES;; PROPYLENE;; TEFLON (TRADEMARK); TENSILE PROPERTIES;; THERMAL EMISSION;; X RAY SPECTROSCOPY
URL	http://hdl.handle.net/2060/20120016680
보고서번호	NASA/TM-2012-217644
발행년도	2012
출처	NTRS (NASA Technical Report Server)
ABSTRACT	Since its launch in April 1990, the Hubble Space Telescope (HST) has made many important observations from its vantage point in low Earth orbit (LEO). However, as seen during five servicing missions, the outer layer of multilayer insulation (MLI) has become successively more embrittled and has cracked in many areas. In May 2009, during the 5th servicing mission (called SM4), two MLI blankets were replaced with new insulation pieces and the space-exposed MLI blankets were retrieved for degradation analyses by teams at NASA Glenn Research Center (GRC) and NASA Goddard Space Flight Center (GSFC). The MLI blankets were from Equipment Bay 8, which received direct sunlight, and Equipment Bay 5, which received grazing sunlight. Each blanket contained a range of unique regions based on environmental exposure and/or physical appearance. The retrieved MLI blanket s aluminized-Teflon (DuPont) fluorinated ethylene propylene (Al-FEP) outer layers have been analyzed for changes in optical, physical, and mechanical properties, along with space induced chemical and morphological changes. When compared to pristine material, the analyses have shown how the Al-FEP was severely affected by the space environment. This paper reviews tensile properties, solar absorptance, thermal emittance, x-ray photoelectron spectroscopy (XPS) data and atomic oxygen erosion values of the retrieved HST blankets after 19 years of space exposure.