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    Please use this identifier to cite or link to this item: http://ccur.lib.ccu.edu.tw/handle/A095B0000Q/102

    Title: 鐵鋁合金摩擦攪拌扣件製程之破裂與疲勞行為分析;Fatigue Analysis of Swept Friction Stir Clinch Joints between Aluminum and Steel Sheets
    Authors: 陳蔚寧;CHEN, WEI-NING
    Contributors: 機械工程系研究所
    Keywords: 剪力試片;疲勞分析;摩擦攪拌扣件;十字試片;Lap-shear specimen;Fatigue analysis;Friction stir clinching;Cross-tension specimen
    Date: 2017
    Issue Date: 2019-05-23 12:52:31 (UTC+8)
    Publisher: 機械工程系研究所
    Abstract: 本研究的目標是鐵鋁合金摩擦攪拌扣件的疲勞分析,內容包含刀具的改良、剪力及十字扣件的破壞及疲勞行為分析、扣件疲勞壽命預測。首先,採用1.6 mm 6061-T6鋁合金及1.0 mm S45C中碳鋼製作扣件試片。依據扣件結構改良刀具設計,並分析進給深度及再進給深度的效應,確認適銲參數。完成剪力及十字扣件試片的製作,進行疲勞試驗,採用光學及掃描式電子顯微鏡對其破壞與疲勞行為進行分析。結果顯示,剪力試片共有三種破壞模式,但十字試片僅有一種。參考試片破壞模式,本研究使用兩種方法進行壽命預測。首先是結構應力法,此法採用剪力及十字試片的結構應力理論解,配合材料之應力-壽命曲線圖,進行壽命預測。其次是應力強度因子法,此法依據主導疲勞裂縫的路徑,取得裂縫的整體及局部應力強度因子解,結合Paris Law,完成壽命預測。最後,本研究以扣件的結構應力及應力強度因子為參數,成功完成兩種試片的實驗資料疊合(data collapse),取得結構應力-疲勞壽命曲線及應力強度因子-疲勞壽命曲線,將可對複雜受力狀態的扣件,進行精確的疲勞壽命預測。
    The objective of this research is fatigue analysis of friction stir clinching (FSC) between aluminum (Al) and mild steel (Fe) sheets including tool improvement, fracture and fatigue behavior for lap-shear (LP) and cross-tension (CT) specimens, and fatigue life prediction. 1.6 mm 6061-T6 Al sheets and 1.0 mm S45C Fe sheets were used for the FSC process. Tool improvement was conducted based on the hook structure of FSC joints. Appropriate processing parameters were obtained by parameter study for indentation depth and re-indentation depth. After making FSC LP and CT specimens, we then conducted fatigue tests and investigated their failure behavior under quasi-static and cyclic loading conditions through optical and scanning electron. Experimental results indicated that LP specimens have three failure modes, while CT specimens have only one failure mode.According to the failure modes of FSC joints, two life prediction methods were used. First was the structural stress (SS) method, which predicted lives by using the SS solutions of LP and CT specimens, associated with S-N curves of sheet materials. Second was the stress intensity factor (SIF) method, which predicted lives by using the global and local SIFs for the paths of dominant fatigue cracks, associated with the Paris Law. Finally, the SS and SIF solutions of FSC joints were taken as the factors to conduct data collapse for fatigue data of two specimens, and then obtain a SS-N curve and a SIF-N curve to accurately predict fatigue lives of FSC joints under complex loading conditions.
    Appears in Collections:[機械工程學系] 學位論文

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