碳纖維強化樹脂在熱循環下之老化行為探討

• Main Authors: Chiou,Song-Rong, 邱嵩榮
• Other Authors: Shin,C-S
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/08134344142840427525

碩士 === 國立臺灣大學 === 機械工程研究所 === 82 === The space environment is highly complex , and all its constiuents can degrade the properties of spacecraft materials to some extent . Graphite / epoxy (gr/ep) are being used in spacecraft because they offer light weight, high specific strength and stiffness and low coefficient of thermal expansion (CTE) . However , for a service life of 30 years, there is concern that the space environment, particularly thermal cycling, may age with graphite/epoxy to change its mechnical characteristics . Materials undergo periods of solar eclipse and sun illumination , the result is temperature cycling . This research is concerned assessing the structural integrity of graphite / epoxy used in spacecraft that is required to withstand the hostile space environment . Of challenge are the design of composites to operate over a broad range of temperature . We selected 4 kinds of range of temperature , such as 40 to 200℃, -60 to 140℃ , -150 to 200℃ and -196 to 200℃, to evaluate its effect . Unidirectional and laminate graphite/epoxy specimen were tested a lot of experiments, such as static tensile and 3 point loading flexure and tensile-tensile fatigue, to evaluate their structural inteqrity before and after damage by thermal cycling.