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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/7711
標題: | 具自我健康監測能力之智慧型奈米複合材料之探討 Smart Nano - composite Materials with Self - health Monitoring Ability |
作者: | Yi-Jie Chen 陳奕杰 |
指導教授: | 單秋成(Chow-Shing Shin) |
關鍵字: | 奈米碳管,自我健康監測,機械式攪拌,真空轉注製程, Carbon nanotubes,Self-health monitoring,Mechanical mixing,Vacuum Assisted Resin Transfer Molding, |
出版年 : | 2017 |
學位: | 碩士 |
摘要: | 在諸如航空航天,船舶和汽車等行業中FRP愈來愈被大量的使用,導致須要監測複合結構和材料的結構完整性。若使用傳統的無損檢測技術(non-destructive testing,NDT)對於實際的材料應用上會有所限制。將CNT添加至FRP並製作出擁有即時的自我健康檢測的能力(Structural Self - health monitoring)之試片以及建構出完善的監測機制為本研究探討之項目。
首先本研究比較CNT色母粒(Carbon nanotubes masterbatch)以及胺基官能化(amino-functionalised )、氧基官能化(Oxygen functionalization)、羧酸基官能化(Carboxylic acid officialization)三種不同基官能化的MWCNTs,在樹脂中之導電性與對應之分散參數,而得到使用胺基官能化MWCNTs為適合的材料 再來針對分散參數上的探討,藉由電阻的分佈性以及穩定性,再配合SEM的拍攝比較,得出超音波震盪1小時加上攪拌時間20min為最佳成果。 第三部分是比較量測用電極安裝至試片外表面以及預先安裝至乾燥纖維布後與試片固化成一體兩種電極安裝方式,透過拉伸試驗配合電阻的監測得到,量測用電極預先安裝至乾燥纖維對於監測效果最好。 第四部分則比較CE、CNT CE、CNT GE三種導電性材料對於拉伸試驗所產生的電阻反應,並探討分散時間對於感測的靈敏性是否有影響。實驗結果得到CNT GE效果最為穩定,且分散時間確實對於感測的靈敏度有影響。 最後比較焊接、鑽孔鎖螺絲、CNT樹脂作為導電膠三種連接方式導線的方式以及[0/-45/90/45]2s、[0/90/90/0]兩種疊層方式與電極放置End tab前與須黏貼End tab之位置兩種電極佈置的情形,並藉由循環加載來探討何種連接情形對於未來在電阻的監測上最為穩定。 經由實驗得知試片以[0/-45/90/45]2s之疊層方式且電極黏貼至End tab之位置並以焊接的方式最為導線的連接在電阻的監測是最佳的。 Fiber reinforced plastic (FRP) has become increasingly used in industries such as aerospace, shipbuilding and automotive, leading to the need of monitoring the structural integrity of composite structures and materials. The use of traditional non-destructive testing (NDT) for composite materials has practical limitions. By adding carbon nanotubes to produce a hybrid-fiber-reinforced plastic may provide the material a possibility for self-health monitoring this work aim at investigate the possibility more usely. Firstly we compard the conductivity of masterbatch nanotubes, and the amine-functionalizes, Oxygen-functionalizes, Carboxylic acid functionalized of MWCNTs in epoxy resin under different dispersion parameters. It was concluded that the use of amine functionalized MWCNTs gave the best conductivity. Secondly for the dispersion parameters was compare, by the distribution of resistance and reproducibility of results as well as SEM observation. It was concluded that Ultrasonic agitation for 1hr and mixing for 20mins way the High speed homogenizer mixing (HSM) gave the optimum results. Thirdly the methods for mounting electrodes on composite specimens were investigated. It was found that by embedding electride under the specimens end tabs give the best results. Lastly we compared the resistance of the three conductive materials of CE, CNT CE and CNT GE for the conductive damage monitoring and discusses the dispersion time on the sensitivity of the sensing. The results indicated the most stable effect was associated CNT GE effect, and the dispersion time does affect the sensitivity of the sensing. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/7711 |
DOI: | 10.6342/NTU201701125 |
全文授權: | 同意授權(全球公開) |
顯示於系所單位: | 機械工程學系 |
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