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http://dx.doi.org/10.5139/JKSAS.2003.31.10.021

Measurement of CTE Change in a Composite Laminate with Aging under Space Environment using Fiber Optic Sensors  

Gang,Sang-Guk (한국과학기술원 기계공학과 항공우주공학전공)
Gang,Dong-Hun (한국과학기술원 기계공학과 항공우주공학전공)
Kim,Cheon-Gon (한국과학기술원 기계공학과 항공우주공학전공)
Hong,Chang-Seon (한국과학기술원 기계공학과 항공우주공학전공)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.31, no.10, 2003 , pp. 21-26 More about this Journal
Abstract
In this research, the change of coefficient of thermal expansion (CTE) of graphite/epoxy composite laminate under space environment was measured using fiber optic sensors. Two fiber Bragg grating (FBG) sensors have been adopted for the simultaneous measurement of thermal strain and temperature. Low Earth Orbit (LEO) conditions with high vacuum, ultraviolet and thermal cycling environments were simulated in a thermal vacuum chamber. As a pre-test, a FBG temperature sensor was calibrated and a FBG strain sensor was verified through the comparison with the electric strain gauge (ESG) attached on an aluminun specimen at high and low temperature respectively. The change of the CTE in a composite laminate exposed to space environment was measured for intervals of aging cycles in real time. As a whole, there was no abrupt change of the CTE after 1000 aging cycles. After aging, however, the CTE decreased a Little all over the test temperature range. These changes are caused by outgassing, moisture desorption, matrix cracking etc.
Keywords
Fiber Optic Sensor; Smart Structure; Space Environment; Thermal Cycling;
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