臺灣博碩士論文加值系統

本研究以Ti-6Al-4V鈦合金為實驗材料，選擇對接接頭，進行電子束銲接(EB銲)，針對鈦合金銲件在硬度、拉伸、等負荷振幅及變動負荷振幅下之疲勞性質及疲勞壽命分析模式進行深入研究，檢視鈦合金銲件設計規範的適用性。並對Gerber與Goodman平均應力修正方法進行評估。
研究結果顯示，在硬度方面，電子束銲件最高硬度位於銲道區，熱影響區次之，母材區硬度最低。在拉伸性質方面，電子束銲件平均拉伸強度為1034 MPa，銲道拉伸強度高於母材。在等振幅疲勞性質方面，對接接頭的電子束銲件疲勞強度高於AWS D1.9規範設計曲線，經由Haigh圖的觀察，可知Ti-6Al-4V銲件落在Haigh圖之Goodman與Gerber平均應力修正方程式之間。在變動振幅疲勞性質方面，不論平均應力為拉伸(傳動歷程)或是輕微壓縮(支架歷程)時，鈦合金Ti-6Al-4V電子束銲件之疲勞壽命預測皆適用Goodman平均應力修正法。

In this study, Ti-6Al-4V titanium alloy weldments with butt joint were produced by electron beam welding (EB welding). Several tests including microhardness, tensile, constant amplitude fatigue and variable amplitude fatigue were performed. The experimental S-N curves were compared to the fatigue design curves recommended by the International Institute of Welding, American Welding Society. Two mean stress correction methods, Goodman and Gerber, were evaluated.
For electron beam welding joints, the highest microhardness occured in the fusion zone. Both the broken positions of tensile and fatigue specimens were in the base metal. Electron beam welding butt joints of Ti-6Al-4V alloy illustrated higher fatigue strength as compared to the fatigue design curves of AWS D1.9 standard. The results showed that the fatigue of electron beam welding specimens under the transmission history and bracket history could be predicted using the Goodman mean stress correction method

中文摘要 .................................................................................... .................................................................................... .... ................. ............ .... I
ABSTRACT ABSTRACTABSTRACT ABSTRACT ........................................................................... ...................... ......... ........ II 誌謝 ………………………………………… ………………………………………… ………………………… …………… .. .Ⅲ
目錄 …………………………………… …………………………………… .. ………………………………… ……… .. ... IV 圖目錄 ………… ………… ………… ................................................................................. ....... ...Ⅶ
表目錄 ………… ... ………………………………… ………………………………… ………………………………… XI
符號說明 ……………………… ……………………… .. ………………………………………… ... …… …. XIIXII
第一章 前言 ……………………………………………………………… ……………………………………………………………… .…... …... ….1
1.1 研究動機與目的 ………………………………………………………… ... …. 1
1.2 文獻回顧 ………………………………………………………………… ...…. 4
1.2.1 鈦合金介紹 ………………………………………………………… ... .. 4
1.2.2 鈦合金之電子束銲接介紹 ……………………………………… ... ….. 6
1.2.3 鈦合金銲接結構之疲勞壽命相關研究 ……………………… ... …… ..7
第二章 理論說 理論說 明………………………………………………………………… ………………………………………………………………… ... ... 13
2.1 應力 -命曲線 ………………………………………………………………… .14
2.2 應力 -壽命法 ………………………………………………………………… .15
2. 3平均應力的影響 …………………………………………………………… .. 16
2.4 循環計數法 ………………………………………………………………… .. 19
2.5 疲勞損傷累積 ……………………………………………………………… .. 21
2.6 變動振幅疲勞 .................................................................................................. 22
2.7 訊號壓縮 ........... ............................................................................................... 24
V
2.8 循序法疲勞壽命分析 ………………………………………………… .. …… 26
2.9 區間法疲勞壽命分析 ………………………………………………… .. …… 28
第三章 研究方法 研究方法 ……… ……… .......................................................... .............................. ......30
3.1 實驗規劃及鈦合金銲接件之製作 ……………………… …………… .. …… 30
3.3 銲接方法 ……………………………… ………………………………… .. …32
3.4 試片加工 ……………………………………………………………… .. …… 33
3.5 金相觀察 ……………………………………………………………… .. …… 35
3.6 機械性質測試 ……………………………………………………… .. ……… 37
3.6.1 硬度測 試………………………………………………………… ... …. 37
3.6.2 拉伸性質測試 ………………………………………………… ... ……. 38
3.6.3 等負荷振幅疲勞測試 …………………………………………… ... …. 39
3.6.4 變動負荷振幅疲勞測試 ……………………………………… ... ……. 40
3.6.5 破斷面觀察及分析 ………………………………………… ... ………. 42
第四章 結果與討論 結果與討論 ............. ............. .................................................. ................ .... ............ ........44
4.1 金相組織觀察 ………………………………………………………… ... …… 44
4.2 硬度性質 ……………………………… ……………………………… ... …… 47
4.3 拉伸 性質 .................................................................................................... ....... 49
4.4 等負荷振幅疲勞性質 ………………………………………………… .….. .... 50
4.5 變動振幅疲勞性質 …………………………………………………… .…... ... 55
4.6 破斷面分析 …………………………… ………................................... ....... ..... 60
4.6.1 拉伸試片破斷面分析 ……………………………………… .…... …… 60
4.6.2 等負荷振幅 疲勞 試片破斷面分析 ……………………… …… .... …… 62
VI
4.6.3 TRN 4.6.3 TRN 變動負荷振幅疲勞試片破斷面分析 ……………………… .. …66
4.6.4 BRK 4.6.4 BRK4.6.4 BRK變動負荷振幅疲勞試片破斷面分析 變動負荷振幅疲勞試片破斷面分析 ................................... ....... 70
第五章 結論 .................................................... .................................................... .... ......................................................... .74
第六章 未來 研究方向 ............................... ............................... ................................................. .................. 76
參考文獻 ................................................. ................................................ .................................. .......................... ......... .. 77
附錄 A AWS DAWS DAWS DAWS D 1.9 相關規範資料 相關規範資料 ............. ......... ........ ...................................... ................ 81

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