本文主旨在探討以克維拉為針縫縫線的針縫三明治複合材料板。三明治結構複材板是以平紋的玻璃纖維布為面材，芯材則為PU發泡材，再以手積層法配合真空袋製作成型。在本文中將以不同針縫變數（針縫間距、針縫密度和縫線線密度）的針縫三明治複材板，和未針縫的三明治複材板之撓曲性質、 衝擊性質和衝擊後壓縮性質做探討與比較。
實驗結果顯示，三明治複合材料板的撓曲性質會隨著針縫間距的降低而上升。針縫間距為5mm的樣本和未針縫的複材板比較其撓曲強度增加了23％；同樣地衝擊負荷也會隨著針縫間距的降低而增加，針縫間距為10mm和未經針縫的樣本相較下，衝擊負荷增加了9.4％。在衝擊吸收能量方面，以針縫間距為25mm的樣本具有最佳衝擊吸收能量，和未針縫的樣本比較，其衝擊吸收能量增加了62.3％。此外，針縫也能明顯地抑制三明治複材板底部脫鍵的面積。
在衝擊後壓縮強度方面，和未針縫的樣本比較，針縫三明治複材板衝擊前及衝擊後的壓縮強度皆有明顯地提升，其中以提高縫線線密度為增加衝擊後壓縮性質的較佳方式。當縫線線密度為340tex的針縫樣本和未針縫的樣本比較，其衝擊後壓縮強度平均提高了33.1％。

In this study, the composite sandwich panels are stitched with Kevlar yarn. Skins of these sandwich structures are plain glass fabrics and the core is polyurethane foam. These sandwich panels are molded by hand lay-up methods and cooperated with vacuum bagging process. The flexural properties, impact behaviors and compression after impact properties of stitched sandwich structures are studied. The effects of the stitched parameters in this study such as stitch spacing, stitch density and linear density of stitch yarn on the relevant mechanical properties as described above are investigated and compared with unstitched structure.

Results show that, the flexural properties of composite sandwich panels are increase with stitch spacing reducing. Compared to the unstitched sandwich panels, the flexural strength of stitched structures are increased up to 23 % in the case of the samples with 0.5mm stitch spacing. The impact failure force increases with the reducing of stitch spacing as well and the impact failure force increased up to 9.4％ which compared to the unstitched sandwich panels. And the impact energy absorption; however, increases about 62.3 % as the stitch spacing is 25 mm, compared to the unstitched sandwich panels. Besides, the debonding area of bottom skin of composite sandwich panels can be constrained by the stitching yarns.

As far as the compression after impact properties are concerned, compared to the unstitched sandwich panels, compression strength before impact and compression strength after impact for the stitched sandwich panels are increased apparently. The increasing of linear density of stitching yarn is the better way to raise compression after impact properties. The compression strength after impact of samples with linear density of stitch yarn of 340 tex is increased about 33.1％ in average.

中文摘要 i
英文摘要 ii
目錄 iv
圖目錄 vii
表目錄 x

第一章 前言
1.1 引言 1
1.2 文獻回顧 6
1.3 研究動機與目的 10

第二章 原理
2.1 針縫原理 12
2.1.1 針縫介紹 12
2.1.2針縫形式 14
2.2 衝擊性質 15
2.2.1 衝擊原理 15
2.2.2 纖維複合材料衝擊能量吸收機構 19
第三章 實驗
3.1 實驗材料 21
3.2 實驗設備與儀器 22
3.3 實驗流程 23
3.4 針縫三明治複合材料平板製備 24
3.5 針縫三明治複合材料纖維體積分率測試 28
3.6 針縫三明治複合材料樑彎曲測試 29
3.7 針縫三明治複合材料板衝擊測試 32
3.8 針縫三明治複合材料板衝擊後壓縮測試 34

第四章 結果與討論
4.1 針縫結構對三明治複合材料樑撓曲性質之影響 36
4.1.1 針縫變數對三明治複合材料樑撓曲性質之影響 37
4.1.2 針縫三明治複合材料樑撓曲破壞模式觀察 43
4.2 針縫結構對三明治複合材料板衝擊性質之影響 49
4.2.1 針縫變數對三明治複合材料板衝擊性質之影響 49
4.2.2 針縫三明治複合材料板衝擊破壞模式觀察 52
4.3 針縫結構對三明治複合材料板衝擊後壓縮性質之影響 62
4.3.1 針縫變數對三明治複合材料板衝擊後壓縮強度之影響 63
4.3.2 針縫三明治複合材料板衝擊後壓縮破壞觀察 68
第五章 結論 73
參考文獻 75
附錄 78

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