探討奈米顆粒對玻璃纖維複合材料動態及靜態壓縮強度之影響

Abstract

本研究主要是探討不同含量的二氧化矽奈米粉體對玻璃纖維/環 氧樹脂奈米複合材料壓縮強度的影響。藉由溶膠-凝膠技術，將粒徑 25 奈米之二氧化矽顆粒均勻分散於環氧樹脂當中。接著，利用真空 手工積層方式，將二氧化矽與環氧樹脂之混合物嵌入單方向玻璃纖維 中，製成含二氧化矽奈米粉體重量比為10,20,及30%之玻璃纖維/環 氧樹脂複合材料平板。隨後，利用鑽石切割機將複合材料平板裁成大 小6 毫米×6 毫米×6 毫米之樣品，以便進行壓縮試驗。分別以油壓式 萬能拉伸實驗機及霍普金森桿來執行靜態及動態壓縮試驗，而測試片 的纖維偏軸角度分別為0°、5°、10°、15°及90°。破壞試片分別以光 學顯微鏡及透射電子顯微鏡觀察，以了解其相關破壞模式。最後，利 用微挫屈模型來解釋二氧化矽奈米顆粒對玻璃纖維複合材料壓縮強 度之影響。

The research is aimed to investigate the compressive strengths of glass fiber/epoxy nanocomposites, containing various loadings of spherical silica nanoparticles. Through a sol-gel technique, the silica particles with a diameter of 25 nm were exfoliated uniformly into the epoxy resin. Subsequently, by inserting the silica epoxy mixture into the unidirectional glass fiber through a vacuum hand lay-up process, the glass fiber/epoxy composite laminates with 10, 20, and 30 wt% of silica nanoparticles were fabricated. Subsequently, the brick specimens with dimension of 6mm× 6mm× 6mm were prepared from the composite laminates using diamond saw for the compression tests. Quasi-static and dynamic compression experiments were conducted on the brick composite specimens with fiber orientations of 0°, 5°, 10°, 15°, and 90° using a hydraulic MTS machine and a Split Hopkinson Pressure Bar (SHPB), respectively. The failure specimens were examined using optical microscopy and Transmission Electrical Microscope (TEM) to determine the failure mechanism. Moreover, the influence of silica nanoparticles on the compressive strengths was properly explicated using the microbuckling model.