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研究生:廖信智
研究生(外文):Hsin-Chih Liao
論文名稱:不同振盪頻率對殘留應力消除之研究
論文名稱(外文):Study of residual stress relief under various vibration frequencies
指導教授:楊錫杭
學位類別:碩士
校院名稱:國立中興大學
系所名稱:精密工程學系所
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:2006
畢業學年度:94
語文別:中文
論文頁數:88
中文關鍵詞:殘留應力振動
外文關鍵詞:residual stressvibration
相關次數:
  • 被引用被引用:5
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本研究以共振、次共振、小波頻三種不同的振盪頻率,分別對銲接處理後的SS41低碳鋼的板材施以應力消除處理實驗,分別比較共振、次共振、小波頻三種頻率對應力消除之效果。應力之量測採用ASTM 標準 E837 規範的“Determining Residual Stresses by the Hole-Drilling Strain -Gage Method”。銲接處理後銲道背面應力的量測結果顯示,越靠近銲道中間之位置殘留應力值為拉應力並且有增加的趨勢,而銲道中間左右兩邊相對應之應力值,呈現一相對應之結果。因此可以推斷出銲道背面的應力分佈狀態呈現左右對稱,越靠近中間的變形量越高,應力值也越高。振盪處理後試片應力的結果顯示,銲道中間點左邊15mm的位置,共振頻處理可以降低應力28.4%、次共振頻為34.3%、小波頻則為39.3%,即利用小波頻對消除殘留應力的效果最佳。針對波形來分析,小波現象主要為一主波以及一高頻波組合而成,此兩波來源均由振動馬達提供。將共振、次共振、小波頻三種頻率之高頻波比較之,發現在小波頻率時,其高頻波之振幅值為最高;次共振之高頻波次之;共振頻之高頻波之振幅值為最低。因此,運用小波頻對殘留應力之消除效果最佳,歸因於高頻波之振幅達到最高。
In this study, SS41 low carbon steel plate after welding was treated by vibration stress relief under resonance, sub-resonance and small wave, respectively. The objective of this research was compared with the effect of stress relief under different vibration frequencies. The residual stress was determined by using the Hole-Drilling Strain Gage Method of ASTM standard E837.The residual stress was measured in back bead after welding, the result showed that value of residual stress was positive and it was the highest in the center of the weld. The residual stress was symmetrical from center of bead to edges of specimen. It was observed that stress distribution of back bead was symmetrical. The residual stress was measured in back bead after vibration. The results showed that the stress relief of resonance, sub-resonance and small wave were reached to 28.4%, 34.3% and 39.3%, respectively. In analysis of wave form, small wave was combined with main wave and high frequent wave and they were provided by vibration motor. Compared to the high frequencies of resonance, sub-resonance and small wave, it was found that the amplitude of high frequent wave was the highest under small wave frequency and the lowest under resonance.
中文摘要 Ⅰ
英文摘要 Ⅱ
致謝 Ⅲ總目錄 Ⅳ
圖目錄 Ⅵ
表目錄 Ⅸ
第一章 前言 1
第二章 文獻回顧 4
2-1 殘留應力 4
2-1.1 銲接殘留應力的形成 6
2-1.2 殘留應力消除之方法 10
2-2 振動消除殘留應力 13
2-2.1 歷史背景 13
2-2.2 振盪應力消除技術 16
2-2.3 振動消除殘留應力的理論 17
2-2.3.1 以力學觀點論之 17
2-2.3.2 以能量觀點論之 21
2-2.4 振動消除殘留應力的效果評定方法 24
2-3 振動消除殘留應力技術的特點 31
2-3.1 振盪消除應力之優點 31
2-4 殘留應力的量測方法 33
2-5 盲孔法量測殘留應力 33
第三章 實驗步驟 38
3-1 實驗流程圖 38
3-2 實驗試片 39
3-3 銲接處理 39
3-4 振盪試驗 40
3-4.1 振動馬達 40
3-4.2 控制器之輸出 41
3-4.3 振幅感測器 42
3-4.4 示波器 43
3-4.5 振盪的參數設定 44
3-5 殘留應力的量測 46
3-5-1 位置之取樣 46
3-5-2 量測設備 47

第四章 結果與討論 51
4-1 施銲前實驗試片之應力分析 51
4-2 銲接後殘留應力分析 52
4-3 頻譜分析 58
4-4 振盪殘留應力分析 60
4-5 小波現象 69

第五章 結論 76

第六章 參考文獻 77

附錄 82
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