5052鋁合金TIG對接銲件疲勞性質與疲勞壽命評估之研究

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姓名

莊信祥(Shin-shiang Juang) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

5052鋁合金TIG對接銲件疲勞性質與疲勞壽命評估之研究

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摘要(中)

本研究以5052-H32鋁合金為實驗材料，選擇對接接頭，進行惰氣鎢極電弧銲接(TIG銲)，對於鋁合金銲接結構件在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。
研究結果顯示TIG銲疲勞試片斷裂點大部分是在銲道上且靠近熱影響區的位置。5052-H32 TIG對接銲件之疲勞強度(S-N曲線)比IIW、BS8118及Eurcode 9等規範之對應的設計曲線高。IIW規範之設計曲線與實驗結果最接近，尤其是在低壽命區域。在高壽命區域，各規範的設計曲線也越保守估計。綜合拉張平均應力歷程(TRN歷程)及輕微壓縮平均應力歷程(BRK歷程)變動振幅疲勞測試結果，建議以Gerber法進行平均應力修正，可得較佳的疲勞壽命預測。5052-H32鋁合金TIG對接銲件在固定振幅疲勞及變動振幅疲勞斷面上皆有疲勞紋產生。

摘要(英)

In this study, 5052-H32 aluminum alloy weldment with butt joint were produced by inert gas tungsten arc welding (TIG welding). The fatigue properties of welded aluminum structures under constant and variable amplitude loadings were obtained, respectively.
The results showed that fracture points of TIG fatigue specimens were mostly at the weld near the heat affected zone, tungsten inert gas welding the fatigue strengths (S-N curves) of 5052-H32 aluminum butt joints were higher than those of design curves proposed by IIW, BS8118 and Eurocode 9 standards. In the short life region, the IIW design curve was the best one which is close to the present experimental results. In the long life region, all the design curves of specifications were more conservative.
With respect to mean stress correction in fatigue life prediction, Gerber method is the best one for 5052-H32 aluminum TIG butt joints. Both of constant amplitude fatigue loading and variable amplitude fatigue loading produce fatigue striations infracture surfaces.

關鍵字(中)

★ 5052
★ 鋁合金
★ TIG銲接
★ 疲勞壽命

關鍵字(英)

★ 5052
★ Aluminium Alloy
★ Inert Gas Tungsten Arc Welding
★ Fatigue Life

論文目次

論文電子檔授權書 #
紙本論文延後公開/下架申請書 #
論文指導教授推薦信 #
口試委員會審定書 #
中文摘要 i
ABSTRACT ii
誌謝 iii
目錄 iv
圖目錄 vii
表目錄 x
符號說明 xi
第一章緒論 1
1.1研究動機 1
1.2研究目的 2
第二章文獻及理論回顧 3
2.1 鋁合金介紹 3
2.2 鋁合金銲接 5
2.2.1 惰性鎢極氣體保護銲(TIG銲) 5
2.2.2 TIG銲接各區域的影響 6
2.2.3 TIG銲接之文獻回顧 8
2.3 銲接結構疲勞壽命評估研究 9
2.3.1 常用熔融銲接結構疲勞設計規範 10
2.3.2 銲接疲勞之文獻回顧 14
2.3.3 銲接壽命影響因子 14
2.4 理論說明 16
2.4.1 應力-壽命曲線(S-N Curve) 17
2.4.2 平均應力的影響 18
2.4.3 循環計數 21
2.4.4 損傷累計 23
2.4.5 應力-壽命法 24
2.4.6 循序法 26
2.4.7 變動振幅 28
2.4.8 訊號壓縮 29
第三章實驗方法與設備 30
3.1實驗材料 31
3.2銲接加工 31
3.3標準試片加工 32
3.4金相觀察 33
3.5機械性質測試 35
3.5.1 硬度測試 35
3.5.2 拉伸測試 36
3.5.3 疲勞測試 36
3.5.4 SEM斷面分析 41
第四章結果與討論 42
4.1金相觀察 42
4.2硬度測試 44
4.3拉伸試驗 45
4.4等負荷振幅疲勞性質 47
4.5變動振幅疲勞性質 51
4.6拉伸試片SEM斷面分析 55
4.7疲勞試片SEM斷面觀察 56
第五章結論 60
5.1.未來展望 61
參考文獻 62
附件A BS 8118規範相關資料 66
附件B Eurcode 9規範相關資料 69
附件C IIW規範相關資料 71

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指導教授

黃俊仁(Jiun-ren Hwang)

審核日期

2013-7-19

推文