臺灣博碩士論文加值系統

在工業界中，有許多接合元件為了符合需求，常使用黏著劑接合方法進行接合，而有許多接合件在動態負荷環境使用下，常因為發生黏著劑脫膠而導致疲勞破壞。因此，本研究將針對黏著劑之基本性質利用單邊搭接之接合方式製作接合件試片。實驗中接合件試片的設計是利用三種不同黏著劑厚度及二種不同黏著長度等變數製作試片。經由靜態拉伸測試後，可獲得其靜態極限負荷並記錄其數據，以作為後續疲勞實驗所需之負荷階。由靜態實驗結果顯示出黏著劑厚度越薄時，其靜態強度越高；而黏著長度對靜態強度並沒有太大的影響。黏著劑接合件之疲勞實驗將設定七個負荷階進行試驗，其負荷階大小分別為靜態極限強度之50％、45％、40％、30％、35％、25％及20％作為疲勞實驗之最大負荷。透過疲勞實驗將可得不同參數之黏著劑接合件之負荷-壽命曲線。並藉此瞭解黏著劑接合件在承受拉伸負載下之疲勞性質。由疲勞實驗結果顯示：黏著劑厚度越薄時，其疲勞強度越高；而黏著長度對疲勞強度並無顯著之影響。除此之外，本研究亦同時藉由有限元素分析法分別對黏著劑接合件之受力狀況進行模擬與分析，對於黏著劑接合件潛在脫膠破壞位置處的應力行為作為基礎，配合黏著劑接合件實驗結果，對於黏著劑接合件的脫膠疲勞破壞模式建立有效之疲勞壽命預測參數。本文中所利用的疲勞壽命預測參數包括最大剝離應力、最大平面內剪應力以及同時考量最大剝離應力與最大平面內剪應力三種參數。經由比較實驗數據之結果發現：考量最大剝離應力，為最好的疲勞壽命預測結果。

In the industrial, there are a lot of joint in order to accord with the demand, often use adhesive joint method , and there is a lot of joint under the dynamic load environment is used, often cause of the fatigue failure because of adhesive debonding. In the research, the static and fatigue strength of adhesive is using the single lapped joint specimens. Adhesive of the joint specimens use three kinds of adhesive thickness and two kinds of over lap. In the static tests, the static limit of the adhesive joint where measured and recorded, in order to load levels needed of fatigue experiment. In the fatigue tests, seven load levels were chosen as the 50%, 45%, 40%, 30%, 35%, 25% and 20%, respectively of the static ultimate strength for each specimen. The loading-life curve where established from the fatigue tests to study the effect of these parameters on the fatigue strength of adhesive joints. Finite element method will be employed in the study to obtain the stress behavior of the adhesive joints under tensile loading. The fatigue life prediction parameter will be developed based on the stress results of the finite element analysis and the mechanical properties of adhesive joints. Three parameters, maximum peeling stress, maximum in-plane shear stress, and combined peeling and in-plane shear stress were employed to correlate with the fatigue life data of the specimens. The correlated results show that the maximum peeling stress provides better fatigue life prediction than the other two parameters.

中文摘要 I 英文摘要 II 目 錄 IV 表目錄 VI 圖目錄 VII 符號說明 XI 第一章 序論 1 1-1 引言 1 1-2 研究內容 2 1-3 章節概要 2 第二章 文獻回顧 4 第三章 實驗內容與程序 8 3-1 試片製作 8 3-2 儀器介紹 9 3-3 實驗步驟與內容 10 3-3-1黏著劑接合件試片靜態拉伸實驗 11 3-3-2黏著劑接合件試片高週次疲勞實驗 11 第四章 有限元素分析 22 4-1黏著劑接合件之有限元素模型簡介 22 4-1-1黏著劑接合件之材料性質 23 4-1-2黏著劑接合件之邊界條件與負載條件 23 第五章 黏著劑接合件之疲勞壽命預測理論 36 第六章 結果與討論 39 6-1黏著劑接合件之靜態實驗結果 39 6-2黏著劑接合件之疲勞實驗及預測結果 40 6-2-1外力負載對疲勞壽命之影響 40 6-2-2疲勞壽命預測結果 41 第七章 結 論 84 參考文獻 86

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