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研究生:黃昱豪
研究生(外文):Yu-Hao Huang
論文名稱:電壓監測碳纖維複材膠合接口受拉伸與疲勞負載之應用
論文名稱(外文):Health monitoring single lap CNT-epoxy joints of CFRP by using voltage change measurement
指導教授:單秋成單秋成引用關係
指導教授(外文):Chow-Shing Shin
口試委員:林志郎莊禮彰
口試日期:2019-07-25
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:機械工程學研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2019
畢業學年度:107
語文別:中文
論文頁數:136
中文關鍵詞:電壓監測結構完整性碳纖維複合材料單搭接膠合接口
DOI:10.6342/NTU201903156
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本研究探討電壓監測碳纖維複材膠合接口受拉伸與疲勞負載之應用,藉由在搭接劑中混入奈米碳管使其具有導電性的方式,以鍍金圓孔針座作為電極量測電壓變化,達到局部監測搭接面的效果。搭接劑中的氣泡與焊接技巧對電性的影響也一併作討論。探討單向拉伸試驗、循環加載卸載拉伸試驗、疲勞試驗的電性變化表現,並分析電壓變化率之平均斜率圖,訂定出臨界嚴重損傷比例常數Kcr。最後透過循環加載卸載拉伸後疲勞試驗,驗證出透過監測比例常數K是否超過臨界嚴重損傷比例常數Kcr的方式,能夠預防膠合接口產生嚴重損傷,達到所謂以電壓監測結構完整性的效果。不同試驗後的試片破斷面會進行巨觀與微觀觀察,並與局部電壓量測的結果作比較。
This study deals with health monitoring single lap CNT-epoxy joints of CFRP by using voltage change measurement. By adding CNT into the adhesive and the use of gold plated sip sockets, localized voltage change measurement can be achieved. This research also investigates the influence of air bubble and soldering technic to the electrical response. After conducting the voltage change measurement during tensile test, cyclic loading tensile test, and fatigue test, we identify a parameter called critical damage ratio(Kcr). Through conducting the fatigue-after-cyclic loading tensile test, the ability of Kcr which utilized as a sensor of critical damage for lap joints has been proved. Last but not least, the correlation of the localized voltage response and the fracture surface images is evaluated.
致謝 I
摘要 II
Abstract III
目錄 IV
圖目錄 VIII
表目錄 XV
第一章 緒論 1
1.1 前言 1
1.2 研究動機 1
1.3 論文架構 2
第二章 文獻回顧 3
2.1 單搭接膠合接口(Single lap joint, SLJ) 3
2.1.1 SLJ製備參數 3
2.1.2 SLJ失效形式 4
2.1.3 膠合接口完整性的檢查與監測 6
2.2 奈米碳管(Carbon nanotube, CNT) 6
2.2.1 導電機制 8
2.2.2 不同種類的CNT 10
2.3 結構完整監測器(Structural health monitor, SHM) 12
2.3.1 完整試片的電性表現 12
2.3.2 搭接劑的電性表現 20
2.3.3 初始電阻下降的原因 26
第三章 實驗材料與設備 27
3.1 實驗材料 27
3.1.1 碳纖維預浸布 27
3.1.2 搭接劑 27
3.1.3 多壁奈米碳管(Muti-wall carbon nanotube, MWCNT) 28
3.1.4 鍍金圓孔針座(排針) 28
3.1.5 導電銀膠 29
3.1.6 排針加固劑 29
3.2 製備碳纖維複材試片用設備 30
3.2.1 熱壓成型系統 30
3.2.2 鑽石砂輪機 31
3.2.3 噴砂機 32
3.3 調配搭接劑用設備 32
3.3.1 電磁加熱攪拌器 32
3.3.2 超音波打碎機 33
3.3.3 高速均質機 33
3.4 加熱設備 34
3.4.1 熱風循環烘箱 34
3.5 機械性質測試相關儀器 35
3.5.1 材料試驗系統(Material test system, MTS) 35
3.5.2 電源量測儀器 36
3.5.3 多功能I/O介面卡(NI-6009) 36
3.5.4 多功能I/O介面卡(NI-6215) 37
3.6 破斷面觀察用設備 38
3.6.1 立體顯微鏡 38
3.6.2 掃描式電子顯微鏡(Scanning electron microscope, SEM) 38
第四章 實驗方法與流程 40
4.1 製備碳纖維強化複合材料單搭接試片 41
4.1.1 製作碳纖維強化複合材料板材 41
4.1.2 搭接前的試片處理 43
4.1.3 調配搭接劑進行搭接 45
4.2 電極布置 47
4.2.1 圓孔針座(排針)的黏合 47
4.2.2 電線焊接 49
4.3 電壓監測膠合接口 51
4.3.1 單向拉伸試驗(T) 51
4.3.2 循環加載卸載拉伸試驗(C) 51
4.3.3 疲勞試驗(F) 52
4.3.4 循環加載卸載拉伸後疲勞試驗(CF) 52
4.4 破斷面觀察 53
4.4.1 巨觀與微觀觀察 53
第五章 實驗結果與討論 54
5.1 搭接劑中的氣泡對電性的影響 54
5.2 焊接技巧對電性的影響 57
5.2.1 焊點觀察法 57
5.2.2 焊接不良對電性的影響 60
5.2.3 焊接技巧的改善 63
5.2.4 良好焊點的判斷基準 65
5.3 試片強度一致性(重複性) 66
5.3.1 單因子變異數分析(Analysis of variance, ANOVA) 66
5.3.2 Levene同質性檢定 71
5.4 單向拉伸試驗(T) 72
5.4.1 電性探討 72
5.5 循環加載卸載拉伸試驗(C) 74
5.5.1 電性探討 74
5.6 疲勞試驗(F) 82
5.6.1 選定基準疲勞試驗. 82
5.6.2 電性探討 83
5.7 循環加載卸載拉伸後疲勞試驗(CF) 89
5.7.1 臨界嚴重損傷比例常數(Kcr)的驗證 89
5.8 破斷面觀察 91
5.8.1 不同試驗的巨觀觀察 91
5.8.2 單向拉伸試驗的微觀觀察 94
5.8.3 破斷面與channel電壓的關係 101
第六章 結論與未來展望 106
6.1 結論 106
6.2 未來展望 107
參考文獻 108
附錄 111
衝擊試驗 132
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