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The Response of 6061-T6 Aluminum Alloy Tubes with Different Chop Depths under Cyclic Bending
不同切痕深度6061-T6鋁合金圓管在循環彎曲負載下行為之研究
摘要
In this paper, the mechanical behavior and buckling failure of 6061-T6 aluminum alloy tubes with different chop depths subjected to cyclic bending were experimentally investigated. It can be seen that the moment-curvature relationship exhibits a steady loop from the first bending cycle. And, the chop depth has almost no influence on the moment-curvature relationship. However, the ovalization-curvature relationship exhibits an increasing and ratcheting manner with the number of the bending cycles. In addition, higher chop depth of a tube leads to a more severe unsymmetrical trend of the ovalization-curvature relationship. Furthermore, the 6061-T6 aluminum alloy tubes with five different chop depths were tested, five unparallel straight lines were found for the controlled curvature-number of cycles to produce buckling relationship in the log-log scale. Finally, the theoretical model proposed by Kyriakides and Shaw in 1987 was modified in this study for simulating the controlled curvature-number of cycles to produce buckling relationship. Through comparison with the experimental data, the theoretical model can properly simulate the experimental findings.
並列摘要
本文係實驗研究不同切痕深度6061-T6鋁合金管在循環彎曲負載下的相關力學行為與皺曲損壞。根據實驗結果顯示，彎矩－曲度關係從第一圈開始便呈現一個穩定的迴圈，且切痕深度對彎矩－曲度關係幾乎沒有影響。至於橢圓化－曲度關係則隨著循環圈數的增加而呈現棘齒狀的成長，且切痕深度越大時，橢圓化－曲度關係就越不對稱，橢圓化量增加也就越大。此外，實驗測試有五種不同切痕深度6061-T6鋁合金管，而在雙對數座標的控制曲度－循環至皺曲圈數關係呈現五條不平行的直線。最後，本文修改Kyriakides and Shaw在1987年所提出的理論來描述控制曲度－循環至皺曲圈數的關係。在與實驗結果比較後發現，理論能夠合理描述實驗結果。