臺灣博碩士論文加值系統

由於複合材料高比強度和高比勁度(specific strength & stiffness)的特性，使纖維強化的高分子基材複合材料成為近來廣泛應用的高性能(high-performance)結構材料。此外，複合材料結構通常以耐久性(durability)的觀點進行設計，所以"可修補性"(repairability)也是複合材料結構設計上的一個重要的考量。熱塑性基材複合材料比熱固性基材複合材料具有易修補的特性，因為樹酯基材在受到如脫層或是基材裂縫的損傷時能夠重新固化(resolidation)將基材裂縫移除並使脫層部分重新黏合，所以本文將採碳纖維強化熱塑性樹酯複合材料以重新加溫加壓的熱壓成形法(thermoforming)對受軸向拉伸負載與扭轉疲勞後的試片進行修補的工作。本文將針對擬均向(quasi-isotropic)[0/+45/90/-45]2S疊層之碳纖維/聚醚醚酮(graphite/PEEK)複合材料基層疊板試片，首先承受應力等級為80% σ0的軸向拉伸和最大扭轉角等於400的扭轉疲勞，在軸向疲勞負載週次/破壞週次分別等於0.2、0.6與扭轉疲勞經900週次時以熱壓法對試片進行修補，觀察熱壓法對複合材料受軸向拉伸及扭轉疲勞的修補效率(repair efficiency)，其中包括修補對疲勞性質與殘留強度的影響；希望能藉此提供一個能使複合材料提昇受破壞後靜態拉伸和拉伸疲勞性質的方法。

目錄
第一章 前言 1
第二章 文獻回顧 3
2-1 複合材料受疲勞的影響 3
2-1.1 影響疲勞性質參數-應力等級
2.1-2. 破壞型態
2.1-3. 應力(S)與破壞週次(Nf)的關係
2.1-4. 殘留強度(residual strength)、勁度(stiffness)與疲勞週次的關係
2-2. 扭轉對複合材料的影響 9
2-2.1. 損傷機構
2-2.2. 靜態強度
2-2.3. 扭轉對疲勞壽命的影響
2-2.4 殘餘強度和模數衰減
2-3. 複合材料的修補 12
2-3.1. 修補方式
2-3.2. 修補準則(Repair Criteria)
2-3.3. 修補的步驟
第三章 實驗內容及程序 21
3-1 儀器簡介
3-1.1 Instron-1322型軸向-扭向液壓伺服動態試驗系統
3-1.2 熱壓機
3-1.3 配有A/D轉換器(analog-to-digital converter)介面卡的PC-AT
電腦
3-1.4 C-scan超音波系統
3-2 試片製作及檢測 23
3-3 實驗程序及方法 24
3-3.1 靜態軸向強度試驗
3-3.2 靜態扭轉試驗
3-3.4 軸向拉伸疲勞試驗
3-3.5 熱壓法(thermoforming)修補
3-3.6 殘留強度試驗
3-3.7 扭轉疲勞與軸向拉伸疲勞之修補
(a) 扭轉疲勞後經修補的軸向拉伸疲勞性質
(b) 軸向拉伸疲勞後經修補的軸向拉伸疲勞性質
(c) 扭轉疲勞與軸向拉伸疲勞後經修補的殘留靜態拉伸強度:
3-4 預估試片數目 26
3-5 熱壓修補之模具與修補方式的探討 27
3-5.1 模具開發
3-5.2 修補方式的研究
第四章 結果與討論 30
4.1 靜態試驗 30
4.1-1 軸向拉伸靜態性質研究
4.1-2 靜態扭轉性質研究
4.2 軸向拉伸疲勞試驗 30
4.2-1 原始(virgin)軸向拉伸疲勞性質研究
4.2-2 經不同週次軸向拉伸疲勞負載與扭轉疲勞負載基層板之超音
波C-Scan檢測
(a)軸向拉伸疲勞試驗
(b)扭轉疲勞試驗
4.2-3 原始(virgin)軸向拉伸疲勞之殘餘勁度研究
4.2-4 扭轉疲勞負載經900週次後之軸向拉伸疲勞性質研究
(a) 未經修補
(b) 經熱壓修補
4.2-5 軸向拉伸疲勞負載C=0.2、0.6之軸向拉伸疲勞性質研究
(a) C=0.2之軸向拉伸疲勞性質研究
(b) C=0.6之軸向拉伸疲勞性質研究
4.3 殘餘強度試驗 41
(a) 軸向拉伸疲勞負載C=0.2、0.6之殘留拉伸強度
(b) 扭轉疲勞負載經900週次後之軸向拉伸疲勞試驗
4.4 SEM微觀破壞型態學 43
第五章 結論 44
參 考 文 獻 46

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