電壓監測碳纖維複材膠合接口受拉伸與疲勞負載之應用

Health monitoring single lap CNT-epoxy joints of CFRP by using voltage change measurement

黃昱豪(Yu-Hao Huang)

指導教授 ： 單秋成

國立臺灣大學/工學院/機械工程學研究所/碩士(2019年)

https://doi.org/10.6342/NTU201903156

摘要

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。

關鍵字

電壓監測結構完整性 ； 碳纖維複合材料 ； 單搭接膠合接口

並列摘要

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.

並列關鍵字

voltage change measurement ； carbon fiber reinforced polymer ； single lap joint

參考文獻

1. ASTM, D5868-01 Standard Test Method for Lap Shear Adhesion for Fiber Reinforced Plastic (FRP) Bonding. ASTM International www.astm.org, 2014.

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