臺灣博碩士論文加值系統

本篇論文中，將針對Alporas封閉式發泡鋁之芯材及平衡編織式玻璃纖維/聚丙烯預浸材之面板製作的三明治夾層樑試片進行四點彎矩之靜態、疲勞實驗與分析，以實驗方法探討其在承受彎矩負載下之靜態及疲勞強度。面板疊層方向、芯材厚度以及面板厚度為此實驗之變數。理論上有五種特徵破壞模式，例如：面板伸破壞、局部壓痕破壞及三種芯材剪切破壞，可從理論求得。在五種臨界負載值中最小值對應之破壞模式，此數值為三明治夾層樑在靜態彎矩測試之預測極限負載。此外，冪定律被用來描述最大施加負載與疲勞壽命之間的關係。在本論文中也探討了面板疊層方向之影響、芯材高度及面板厚度之研究。紀錄夾頭位移量與討論由負荷控制之疲勞壽命過程。三明治夾層樑靜態實驗中，芯材厚度越厚其極限負載越高，因為可承受之剪應力最高。實驗結果表示位移範圍幾乎保持不變直到最終疲勞壽命，這意味著大部分的疲勞壽命是花在損傷形成。三明治夾層試片疲勞實驗之最大負載-疲勞壽命曲線圖決定係數皆於0.79以上，表示實驗數據點與擬合直線接近。

In this thesis, the static and bending fatigue strengths of the sandwich beams with glass/polypropylene laminate faces and aluminum foam core were experimentally analyzed. The ply directions of the laminate faces, the core heights, and the face thicknesses were considered as the variables in the experimental program. The critical loads for five considered characteristic failure mode, i.e., face failure, local indentation, and three types of core shear failure, were obtained theoretically. The minimum critical load among the five critical loads corresponding to the five failure modes is the predicted ultimate load for the studied sandwich beams under static bending tests. Furthermore, the power-law model was employed to describe the relationship between the maximum applied loads and the fatigue life data. The effects of the ply directions of the faces, the core heights, and the face thicknesses on the fatigue strength of the studied sandwich beams were also discussed in this thesis. The displacement behavior of the crosshead was recorded and discussed during the load-controlled fatigue life history. Sandwich beam static test, the thicker the core of its limit load is higher, because of the shear stress can withstand the highest. Experimental results show that the displacement range almost remained constant until the final stage of the fatigue test, implying the majority of the fatigue life was spent in the damage initiation. Sandwich specimen fatigue test of the maximum load - fatigue life curve coefficients of determination are carried out in 0.79 above, which means that the experimental data points and fitting close to a straight line.

摘要 I
Abstract II
目錄 III
圖目次 V
表目次 IX
符號說明 X
第一章 序論 1
1-1 前言 1
1-2 研究內容 1
1-3 本文架構 1
第二章 文獻回顧 2
2-1 三明治夾層樑之靜態強度分析 2
2-2 三明治夾層樑之疲勞強度分析 5
第三章 靜態行為之理論推導 9
3-1 彈性勁度 9
3-2 三明治夾層樑之靜態破壞模式 9
3-2.1 面板靜態破壞 9
3-2.2 局部壓痕靜態破壞 10
3-2.3 芯材剪切A模式靜態破壞 10
3-2.4 芯材剪切B模式靜態破壞 11
3-2.5 芯材剪切AB模式靜態破壞 11
第四章 實驗內容及程序 19
4-1 材料與試片製作 19
4-1.1 面板製作 19
4-1.2 三明治夾層樑試片製作 19
4-2 三明治夾層樑試片承受四點彎矩之靜態實驗 20
4-3 三明治夾層樑試片承受四點彎矩之疲勞實驗 20
第五章 結果與討論 25
5-1 三明治夾層樑試片靜態實驗結果 25
5-2 三明治夾層樑各種變數負載-位移圖之比較 26
5-3 極限負載與勁度之預測結果 27
5-4 三明治夾層樑試片之疲勞實驗結果 27
5-5 三明治夾層樑試片之疲勞實驗最大負載-疲勞壽命曲線圖及負荷階-疲勞壽命曲線圖 28
5-6 三明治夾層樑試片之疲勞實驗位移-週次圖 28
5-7 三明治夾層樑各種變數之最大負載-疲勞壽命曲線圖比較 29
5-8 三明治夾層樑各種變數之負荷階-疲勞壽命曲線圖比較 29
第六章 結論 83
參考文獻 84

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