本文針對不同內/外直徑圓管於承受循環彎曲負載時，所呈現出的力學行為、皺曲損壞現象及管徑成長的變化，進行實驗與理論研究。
實驗方面：採用三種不同內/外直徑SUS316L不銹鋼圓管，在對外直徑做適度的車削以得到實驗設定的外徑/壁厚比後，進行純彎曲實驗。研究係運用"彎管試驗機"及"曲度-橢圓化量測器"來進行不同曲度控制下循環彎曲至皺曲的實驗。在訊號擷取上，利用實驗儀器上的力檢出器測得的拉力，在經過簡單計算後得到彎曲力矩值的大小，而曲度-橢圓化量測器則用來量測曲度與橢圓化的變化。同時電腦也記錄鋼管到達皺曲時的循環次數。
理論方面：採用內涵時間理論結合虛平麮z、ANSYS有限元素分析軟體與ABAQUS有限元素分析軟體，來分析圓管在循環彎曲負載時，彎矩、曲度、橢圓化的相互關係。
實驗中發現，控制曲度與循環到皺曲圈數的關係於雙對數圖中呈現互相平行的直線；而且，橢圓化的變化曲線與循環圈數的關係非常類似於單軸潛變負載的潛變應變(ε)與時間(t)的關係。因此本文分別參考Kyriakides[1]與單軸潛變Baily-Nortron公式，提出三個新的理論公式來描述相同內直徑但不同Do/t比，及不同內直徑卻有相同Do/t比之SUS316L不銹鋼圓管的控制曲度(κc)與循環到皺曲圈數(Nb)的關係及橢圓化大小(ΔDo/Do)和循環次數(N)的關係。
分析結果顯示，本文所提出的理論公式於曲度控制下，描述不同的管徑及不同的外直徑-厚度比之SUS316L不銹鋼圓管的控制曲度(κc)與循環到皺曲圈數的關係(Nb)及橢圓化大小(ΔDo/Do)和循環次數(N)的關係，有令人滿意的結果。

This study presents the mechanical behavior, buckling failure and the accumulate ovalization of the experimental and theoretical analysis on circular tubes with different inside/outside diameters subjected to cyclic bending.
For experimental aspect, three different inside/outside diameters of SUS316L stainless steel tubes were used in this study. The outside diameter of tubes was slightly machined to obtain the desired outside-diameter / wall-thickness ratio. The “tube bending machine” and “curvature-ovalization measurement apparatus” were used to conduct the curvature-controlled cyclic bending to buckling test. For signal detection, the load cells on the tube bending machine were used to measure the tube bending moment, and the inclinometers and magnetic detector on the curvature-ovalization measurement apparatus were used to measure the tube curvature and tube ovalization. Simultaneously, the number of cycles to produce buckling was also recorded.
For theoretical aspect, the Endochronic theory combined with the principle of virtual work, the finite element analysis software ANSYS and finite element analysis software ABAQUS were used to analyze the relationship among bending moment, curvature and ovalization.
On experimental results, the relationship between the ovalization and number of cycles to produce buckling on log-log scale shows similar parallel straight lines. And, the relationship between the ovalization and the number of cycles under pure bending is similar to the relationship between the creep strain and time under uniaxial creep. Therefore, the formula to refer to the Kyriakides [1] and the Baily-Nortron law for uniaxial creep was considered, two new theoretical models were proposed to simulate the ovalization and number of cycles to produce buckling (buckling failure) and the ovalization and the number of cycles under pure bending for same inner diameter on different Do/t ratio and different inner diameter on same Do/t ratio of SUS316L stainless steel tubes.
In the event, under controlled-curvature pure bending, the new theoretical models were proposed could be properly simulate the ovalization and number of cycles to produce buckling and the ovalization and the number of cycles of circular tubes of SUS316L stainless steel.

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