熱壓修補對Gr/PEEK積層板經預疲勞週次及衝擊後之拉伸疲勞壽命之影響

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研究生：	陳保松
論文名稱：	熱壓修補對Gr/PEEK積層板經預疲勞週次及衝擊後之拉伸疲勞壽命之影響
指導教授：	葉銘泉
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：	2001
畢業學年度：	89
語文別：	中文
中文關鍵詞：	熱壓修補、Gr/PEEK 、疲勞壽命
相關次數：	點閱：1 下載：0
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本文將針對經能量衝擊及預疲勞週次破壞之擬均向熱塑性積層板，透過熱壓修補，探討該修補方式對拉伸疲勞壽命之影響。
一般我們常以C-Scan掃描試片脫層情況來判定其試片的疲勞性質，因此本實驗使用「二因配置實驗計劃法」，推算出溫度為影響修補面積之主要參數。並試驗溫度參數是否和C-Scan掃描所預測的疲勞性質一致，比較出最佳之修補條件。並以此最佳修補條件，對「受預疲勞週次破壞」以及「受預疲勞週次破壞後又經衝擊破壞」之試片進行修補，探討其熱壓修補對拉伸疲勞試驗之影響。結果發現，熱壓修補不但使得「受預疲勞週次破壞」及「受預疲勞週次破壞後又經衝擊破壞」的疲勞性質無法改善，更使其疲勞性質反而因為熱壓後，造成基材劣化而變差。

摘要
符號說明     ................................................iv

表目錄 ..................................................vi

圖目錄 ................................................viii

第一章       前言 ............................................1

第二章       文獻回顧 ........................................3

 2-1 熱塑性複合材料Graphite/PEEK      .....................3

 2-2 複合材料之疲勞性質       ..............................4

  2-2.1      破壞型態

  2-2.2      應力(S)與破壞週次( Nf )的關係

  2-2.3      殘餘強度、勁度與模數( Modulus )的變化

 2-3 衝擊對複合材料的影響 ............................9

  2-3.1      破壞型態

  2-3.2      衝擊對疲勞的影響

  2-3.3      衝擊後殘餘強度

 2-4 預疲勞週次與衝擊雙重效應的影響 .................11

 2-5 修補 ...........................................11

 2-6 反應曲面法 .....................................12

第三章       實驗內容與程序 .................................13

 3-1 儀器簡介 .......................................13

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

  3-1.2      實驗控制系統及資料記錄軟體

  3-1.3      熱壓機

  3-1.4      C-Scan超音波系統

  3-1.5      貫穿衝擊試驗機

  3-1.6      迷你塔衝擊試驗機

  3-1.7      修補模具製作

 3-2 試片製作及檢測 .................................16

  3-2.1      預浸材與夾持片準備

  3-2.2      熱壓

  3-2.3      試片檢測

  3-2.4      End-Tab接著

  3-2.5      反應曲面法

 3-3 實驗程序及方法 .................................18

  3-3.1      原始試片靜態軸向拉伸強度及疲勞試驗

  3-3.2      修補條件試驗

   3-3.2.1   衝擊破壞

   3-3.2.2   熱壓修補

   3-3.2.3   C-Scan掃描

   3-3.2.4   實驗計劃法

  3-3.3      衝擊破壞後靜態軸向強度與軸向拉伸疲勞試驗

   3-3.3.1   殘餘強度試驗

   3-3.3.2   軸向拉伸疲勞試驗

  3-3.4      衝擊破壞之熱壓修補

  3-3.5      預疲勞週次破壞及熱壓修補

  3-3.6      預疲勞週次與衝擊雙重破壞及熱壓修補

 3-4 試片數目 ......................................26

第四章       結果與討論 ....................................28

 4-1 貫穿衝擊試驗 ..................................28

 4-2 原始試片 ......................................29

 4-3 以C-Scan掃描判斷修補條件 ......................31

 4-4 經30%Ei能量衝擊試片 ...........................31

  4-4.1      未經修補

  4-4.2      經300℃、1000psi、5mins熱壓修補

  4-4.3      經250℃、1000psi、5mins熱壓修補

  4-4.4      經200℃、1000psi、5mins熱壓修補

  4-4.5      三種修補溫度之比較

 4-5 經預疲勞週次N / Nf =0.25試片 ..................36

  4-5.1      未經修補

  4-5.2      經250℃、1000psi、5mins熱壓修補

 4-6 經預疲勞週次N / Nf =0.25再經30%Ei能量衝擊試片..39

  4-6.1      未經修補

  4-6.2      經250℃、1000psi、5mins熱壓修補

第五章       結論與建議 ....................................42

第六章       參考文獻        ......................................44

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