本文提出了不同直徑與厚度比為16.5、31.0和60.0，不同孔徑為2、4、6、8和10 mm的6061-T6鋁合金圓孔管的響應和失效實驗結果表明，彎矩與曲率的關係從第一個週期開始就呈現出穩定的循環。由於孔較小且局部，因此孔直徑對彎矩-曲率關係的影響最小。但是，隨著循環數的增加，橢圓化與曲率的關係描繪出棘狀不對稱增加和領結狀的趨勢。孔的直徑對兩者之間的關係有很大影響。此外，對6061-T6鋁合金圓孔管進行了三種不同的直徑與厚度比和五個不同的孔直徑的測試，控製曲率與破壞圈數的關係對於每個直徑與厚度的比率，以對數-對數圖顯示失效關係所需的周期顯示為不平行的直線。最後，使用有限元素法軟體ANSYS來模擬彎矩-曲率和橢圓化-曲率的關係，並建立經驗公式將該模擬結果與實驗結果進行比較，發現理論分析可以合理地再現實驗結果。

The thesis presents the response and failure of 6061-T6 aluminum alloy round-hole tubes with different diameter-to-thickness ratios of 16.5, 31.0, and 60.0 and with different hole diameter of 2, 4, 6, 8, and 10 mm subjected to cyclic bending. The experimental results revealed that the moment-curvature relationship exhibited a steady loop from the first cycle. Because the holes were small and local, hole diameters showed minimal influence on the moment-curvature relationship. However, the ovalization–curvature relationship depicted ratcheting, asymmetrical, increasing, and bowtie-like trends as the number of cycles increased. The hole diameter showed substantial influence on the relationship. Furthermore, the 6061-T6 aluminum alloy round-hole tubes were tested with three different diameter-to- thickness ratios and with five different hole diameters, the relationship between the controlled curvature and the number of cycles needed to initiate failure relationships in a log–log scale displayed nonparallel straight lines for each diameter-to-thickness ratio. Finally, the finite element ANSYS was used to simulate the moment-curvature and ovalization–curvature relationships, and an empirical formula was proposed to simulate the relationship between the controlled curvature and number of cycles needed to initiate failure. The simulation result was compared with the experimental results, and it was found that the theoretical analysis could reasonably reproduce the experimental results.

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