熱壓修補對Gr/PEEK複合材料經溫度效應及扭轉疲勞後軸向疲勞壽命之研究

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研究生：	吳威憲 wu, wei-hsien
論文名稱：	熱壓修補對Gr/PEEK複合材料經溫度效應及扭轉疲勞後軸向疲勞壽命之研究 Fatigue Analysis of Hot-Press Repair Gr/PEEK under temperature and Torsional Fatigue
指導教授：	葉銘泉　博士　 Dr. Ming-Chuen Yip
口試委員:
學位類別：	碩士 Master
系所名稱：	工學院 - 動力機械工程學系 Department of Power Mechanical Engineering
論文出版年：	2000
畢業學年度：	88
語文別：	中文
論文頁數：	88
中文關鍵詞：	熱壓修補
外文關鍵詞：	Hot-Press Repair
相關次數：	點閱：2 下載：0
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複合材料以基材來分類可分成熱固性複合材料與熱塑性複合材料。熱塑性複合材料具有更佳的衝擊韌性、延性以及環境抵抗力，製程時間短，而且熱塑性複合材料可以重新加熱熔融再固化，不但易於修補，更兼具可回收再利用的優點，所以熱塑性複合材料在工業上逐漸受到重視。
本篇論文針對熱塑性複合材料－碳纖維強化聚醚醚酮

（Graphite/Polyetheretherketone, Gr/PEEK）經60℃72小時溫度效應及40°∼4°扭轉疲勞900週次以及雙重環境效應後，做軸向靜態拉伸試驗、軸向疲勞拉伸試驗及經熱壓法修補後之靜態、疲勞拉伸試驗。

實驗結果顯示，溫度效應在殘餘強度上並沒有影響；但在疲勞壽命上，由於高分子基的劣化，使得壽命縮短許多且離散性很大。扭轉疲勞900週次會讓試片產生脫層，對殘餘強度約有7%的劣化，影響有限；但在疲勞壽命上則有33%~60%的劣化作用。扭轉疲勞與溫度不同施加順序雙重效應對殘餘強度影響不大，但在疲勞壽命上則有劣化作用。而先承受扭轉疲勞後再溫度效應的試片之疲勞壽命會比先承受溫度效應後再扭轉疲勞之疲勞壽命短。

試片經熱壓修補後，在殘餘強度上並沒有提升；但在疲勞壽命上均有一定程度的提升，這顯示熱壓修補對試片疲勞壽命的回復有不錯的成效。

一、前言                                                   1
二、文獻回顧                                              2

2-1 熱塑性複合材料Graphite/PEEK                           2

2-2 疲勞對複合材料的影響                                  2

2-2.1 影響疲勞的參數                                    3

2-2.2 破壞型態                                          4

2-2.3 應力(S)與破壞週次(Nf)的關係                        4

2-2.4 破壞包絡線(failure envelope)                          5

2-2.5 殘餘強度(residual strength)、勁度(stiffness)與疲勞週次的關

     係                                                5

2-3 扭轉對複合材料的影響                                  7

2-3.1 損傷機構                                          7

2-3.2 扭轉對疲勞壽命的影響                              8

2-3.3 殘餘強度、勁度                                    8

2-4 溫度對複合材料之影響                                  9

2-5 修補                                                 10

三、實驗內容及程序                                       12

3-1 儀器簡介                                             12

3-1.1 Instron-1322型軸向-扭向液壓伺服動態試驗系統        12

3-1.2 熱壓機                                           13

3-1.3 實驗控制系統及資料記錄軟體                       13

3-1.4 C-scan超音波系統                                 13

3-1.5 桌上型恆溫恆濕試驗機                             14

3-1.6 噴砂機及砂紙機                                   14

3-2 試片製作及檢測                                       14

3-3 實驗程序及方法                                       15

3-3.1 靜態軸向強度試驗                                 15

3-3.2 靜態扭轉試驗                                     16

3-3.3 扭轉疲勞試驗                                     16

3-3.4 軸向拉伸疲勞試驗                                 16

3-3.5 溫度效應                                         16

3-3.6 殘餘強度試驗                                     17

3-3.7 扭轉疲勞與溫度效應後之修補                       17

(a) 扭轉疲勞後經修補的軸向拉伸疲勞性質              17

(b) 先扭轉疲勞再經溫度效應後經修補的軸向拉伸疲勞性質17

(c) 先溫度效應再經扭轉疲勞後經修補的軸向拉伸疲勞性質17

3-4 預估試片數目                                         18

3-5 修補方法                                             18

四、結果與討論                                           20

4-1 原始試片靜態試驗                                     20

4-2 原始試片經扭轉疲勞後之C-Scan圖分析                  20

4-3 殘餘強度試驗                                         20

4-3.1 經扭轉900週次後未經修補與經修補後之殘餘強度試驗 20

(i) 未經修補

(ii) 經修補

4-3.2 經溫度效應後之殘餘強度試驗                       21

4-3.3 經扭轉900週次及溫度效應後未經修補與經修補後之殘餘

     強度試驗                                         22

(a) 先經60℃72小時後再經40°∼4°之扭轉疲勞900週次22

(i) 未經修補

(ii) 經修補

(b) 先經40°∼4°扭轉疲勞900週次後再經60℃72小時  22

(i) 未經修補

(ii) 經修補

(c) 溫度效應與扭轉疲勞先後順序的影響                23

4-4 軸向拉伸疲勞試驗                                     24

4-4.1 原始試片之軸向拉伸疲勞壽命分析                   24

4-4.2 經溫度效應後之軸向拉伸疲勞壽命分析               25

4-4.3 經扭轉900週次後未經修補與經修補後之軸向拉伸疲勞壽

     命分析                                           25

(i) 未經修補

(ii) 經修補

4-4.4 經扭轉900週次及溫度效應後未經修補與經修補後之軸向

     拉伸疲勞壽命分析                                 27

(a) 先經60℃72小時後再經40°∼4°之扭轉疲勞900週次 27

(i) 未經修補

(ii) 經修補

(b) 先經40°∼4°之扭轉疲勞900週次後再經60℃72小時 29

(i) 未經修補

(ii) 經修補

(c) 溫度效應與扭轉疲勞先後順序的影響                31

4-4.5 軸向拉伸疲勞過程中勁度的變化                     32

五、結論與建議                                          34

5-1 結論                                                 34

5-2 建議                                                 35

參考文獻                                                 36

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