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研究生:楊智涵
研究生(外文):Yang chihhan
論文名稱:孔距對貼片修補之碳纖維/環氧樹脂複合材料之靜態與疲勞行為的影響
論文名稱(外文):The effect of hole distances for static and fatigue behaviors of Gr/Epoxy composite materials with patch repair
指導教授:葉銘泉葉銘泉引用關係
指導教授(外文):Yip Ming-Chuen
學位類別:碩士
校院名稱:國立清華大學
系所名稱:動力機械工程學系
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:中文
論文頁數:78
中文關鍵詞:複合材料靜態疲勞貼片修補孔距
相關次數:
  • 被引用被引用:2
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  • 下載下載:46
  • 收藏至我的研究室書目清單書目收藏:0
複合材料所使用的範圍包含航太汽車等工業,而元件在製造過程中會有無法避免的缺陷產生,到使用階段或運作時承受靜態或往復持續的動態負荷而產生損傷,加上複合材料零件或構造由於設計的結構
、配線的問題或構件互相連接上的需要,往往需要進行鑽孔加工,而圓孔因為加工容易且應力集中現象較為緩和,是最常使用的方式。在考慮時效性與經濟效益下,如果構件損傷程度尚未達到影響其整體結構安全,則可以用修補的方式延長構件的使用年限。
因此本文針對碳纖維強化的熱固性複合材料(graphite/epoxy)依照[0/+45/90/-45]2s共16層堆疊方式使成擬均向性積層板後,於試片中心橫向穿兩個3公厘大小的孔洞,以研究孔洞間距改變及修補與否的方式,來探討孔距對試片靜態與疲勞性質的影響。
對靜態拉伸而言,開孔試片因為應力集中以及纖維束斷裂等因素
,造成靜態強度降低,而隨著孔距越窄,所受的影響越大;單邊修補
由於中立軸偏移影響修補效應,修補效果不如預期,此於雙邊修補試
片得到印證。
對拉伸疲勞來說,開孔試片與修補過後的試片兩大類的疲勞壽命
都較原始試片為低;單邊修補後的開孔試片,由於中立軸偏移以及應力集中的現象,造成修補的效果不如預期。而在雙邊修補試片,免除中立軸偏移所造成的彎曲效應,以及擁有較強的抗拉強度,因此可達到較佳的疲勞壽命。
表目錄 Ⅲ
圖目錄 Ⅳ
第一章 前言及研究動機 1
第二章 文獻回顧 4
2-1 Graphite/epoxy複合材料介紹 4
2-2 複合材料疲勞性質 5
2-3 疲勞破壞機制 5
2-4 影響疲勞因素 6
2-5 應力(S)與破壞週次(Nf)間的關係 7
2-6 具圓孔複合材料的特性 8
2-7 複合材料的修補 14
第三章 實驗內容及程序 17
3-1 實驗材料與試劑 17
3-2 實驗儀器及設備 17
3-3 實驗流程 19
3-4 試片製作及檢測 19
3-5 實驗方法與程序 22
3-6 試片使用數量 24
第四章 結果與討論 26
4-1 靜態拉伸試驗 26
4-2 拉伸疲勞試驗 28
4-3 疲勞破壞型態 34
第五章 結論 37
參考文獻 39
附表 44
附圖 50
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