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研究生:李仁志
研究生(外文):Li Ren-Zhi
論文名稱:裂縫填充引起疲勞裂縫生長遲滯之探討與預測
論文名稱(外文):An Investigation of Artificial Infiltration Induced Fatigue Crack Growth Retardation.
指導教授:單秋成單秋成引用關係
指導教授(外文):Shin Chow-Shing
學位類別:博士
校院名稱:國立臺灣大學
系所名稱:機械工程學研究所
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:1998
畢業學年度:87
語文別:中文
中文關鍵詞:異物填充法鑽孔填充法疲勞裂縫修補預測模型有限元素分析接觸應力
外文關鍵詞:Fatigue damage repaircrack closurecrack infiltrationcrack growth retardationhole-drilling infiltration methodinfiltration effect prediction model
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在疲勞裂縫面上以人為方式引進填充物,文獻中已證實此法可使裂縫面提早封閉,降低有效應力強度因子幅,引起裂縫生長遲滯,但此類文獻大多僅限於實驗方面之探討,或是過於簡化的模型估算修補後之生長遲滯趨勢;本文之研究工作除了以實驗方式探討各參數對裂縫生長遲滯之影響,例如母材之機械性質、填充物之機械性質、施力條件與填充條件等等,另外提出一個新的模型估算疲勞裂縫之修補效果,此模型之變數可涵蓋上述各種參數之影響,在大部份施力或填充情況下,預測結果均能與本文以及文獻中之實驗結果相吻合。實驗方面另行開發一個新的填灌方法-鑽孔填充法,本文中大部份之實驗結果皆以此法填充異物,相較於文獻中之填充方法,此法兼具設備簡便及修補效果良好之優點,最重要的是,此方法具有非常優越之可擴充性,例如現場或表面裂縫方面之修補應用等等,未來將朝此方向繼續研究。此外,為驗證模型之合理性,另輔以有限元素分析裂縫面內填充異物時之接觸應力分佈,分析結果顯示,預測模型與有限元素分析之結果趨勢相符,包括裂縫面上之接觸應力會在較遠離裂縫尖端之部位先接觸,再慢慢往裂尖方向延伸,及隨著裂縫之增長,裂縫面上與填充物間之接觸應力也會逐漸變化等等,同時有限元素分析也提供說明填充物之楊氏係數與填充範圍確實會影響填充結果。
It is well known that fatigue fracture accounts for a great number of machanical failures. When a fatigue crack is discovered in a critical component during routine maintenance, replacement of component may not be feasible as there may not be stocks or the available down-time is too limited. Some expeditious provisory fixing may then be needed to allow the component to operate safely until more elaborate repair or replacement can be arranged. Research in fatigue has largely been concentrated on understanding the mechanisms and predicting the progress of failures. Relatively little work has been done on repairing fatigue damage. Recently, infiltration of foreign materials into a fatigue crack has previously been shown to be able to retard a crack and extend fatigue life. Systematic investigation in this topic is however still lacking. The methods employed to infiltrate foreign materials into a crack are not very reliable, giving haphazard results most of the time. The aim of the current project is to develop an efficient infiltration method to ensure thorough and reproducible results. With this method, the effect of various parameters such as infiltration load level, mechanical properties of the infiltrants and applied loading level have been investigated. In addition, a successful engineering model to predict the possible outcome of retardation repair has been proposed. This has been compared with experimental results as well as a detailed three-dimensional finite element analysis.
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