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題名 | 循環彎曲負載下橢圓形凹槽圓管皺曲損壞之實驗分析=Experimental Analysis on the Buckling Failure of Elliptical-Notched Circular Tubes Subjected to Cyclic Bending |
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作 者 | 李國龍; 洪兆宇; 潘文峰; | 書刊名 | 中正嶺學報 |
卷期 | 41:2(A) 2012.11[民101.11] |
頁次 | 頁183-190 |
分類號 | 440.21 |
關鍵詞 | 橢圓形凹槽304不銹鋼管; 循環彎曲; 橢圓化; 循環彎曲至皺曲圈數; Elliptical-notched 304 stainless steel tubes; Cyclic bending; Ovalization; Number of cycles to produce buckling; |
語文 | 中文(Chinese) |
中文摘要 | 本文主要係實驗分析五種不同橢圓形凹槽深度的304不銹鋼管在循環彎曲負載下的皺曲損壞行為。實驗結果顯示,不論任何凹槽深度,鋼管的彎矩-曲度關係皆呈現循環硬化的現象,且最後會形成一穩定的迴圈。而橢圓化-曲度關係則呈現不對稱、棘齒狀的變化,且凹槽深度越淺,不對稱現象會越明顯。由雙對數座標中控制曲度-循環至皺曲圈數的關係中發現,五種不同凹槽深度的試件可近似為五條幾乎平行的直線。最後,本文運用1987年Kyriakides and Shaw所提出的理論方程式,並提出一個與凹槽深度相關的材料參數方程式來描述上述的行為。在與實驗值做比較後發現,理論分析能合理的描述實驗結果。 |
英文摘要 | This paper presents an experimental investigation on the buckling failure of 304 stainless steel tubes with five different elliptical-notched depths subjected to cyclic bending. It can be observed from the experiment data that the steel tube with any notch depth exhibits a cyclic hardening phenomenon from the moment and curvature relationship, and a steady-state loop is found after a few loading cycles. From the relationship between the ovalization and curvature, an unsymmetric and ratcheting manner of the curve is found. Lower notch depth leads to further unsymmetry of the curve. It can also be observed from curvature-number of cycles to produce buckling curve that five almost parallel straight lines can be found for five different notch depths in a log-log scale. Finally, by using the theoretical equation introduced by Kyriakides and Shaw in 1987, a material parameter equation for the notch depth was proposed in this study to simulate the aforementioned relationship. By comparing the theoretical analysis with the experimental data, it is shown that the theoretical formulation can properly represent the experimental results. |
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