| 研究生: |
張浩元 Chang, Hao-Yuan |
|---|---|
| 論文名稱: |
圓管在循環彎曲負載下平均彎矩對皺曲行為影響之實驗研究 Experiment Investigation for The Buckling of Circular Tubes with Different Mean Moment under Cyclic Bending |
| 指導教授: |
潘文峰
Pan, Wen-Fung |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 工程科學系 Department of Engineering Science |
| 論文出版年: | 2003 |
| 畢業學年度: | 91 |
| 語文別: | 中文 |
| 論文頁數: | 83 |
| 中文關鍵詞: | 彎矩比 、平均彎矩 、圓管 |
| 外文關鍵詞: | moment ratio, mean moment, circular tube |
| 相關次數: | 點閱:90 下載:4 |
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本文利用『彎管實驗機』及『曲度-橢圓化量測器』對D/t比為60的SUS 304無縫不銹鋼圓管試件進行不同彎矩比的循環彎曲負載實驗,並利用彎矩比來描述平均彎矩對皺曲行為影響之研究。彎矩比的影響是以r值來定義,其中r為最小彎矩量除以最大彎矩量。本文針對r=-1、r=-0.5及r=0的三種彎矩比,在固定的加載率下,控制不同的彎矩範圍,來觀察彎矩比、循環至皺曲次數、曲度及橢圓化四者間的變化關係。
由實驗結果顯示,當圓管受循環彎曲負載時,在固定的彎矩範圍(ΔM)控制值下,r越小時,則皺曲行為發生所需的圈數越多;當循環彎曲的彎矩設定值越大,則橢圓化的變化量也會越大,但循環至皺曲所需的圈數卻會越少。此外,在循環彎曲負載時,最初會有循環硬化的情形發生,管徑亦呈現橢圓化的情形,隨著循環次數的增加,彎曲力矩與彎曲曲度的關係趨近於穩定,而管徑橢圓化亦有增加的趨勢,但增加的趨勢逐漸緩和。
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