VISCOPLASTIC COLLAPSE OF SHARP-NOTCHED CIRCULAR TUBES UNDER CYCLIC BENDING |
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Authors: | Kuo-Long Lee Chien-Min Hsu Wen-Fung Pan |
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Institution: | [1]Department of Computer Application Engineering, Far East University, Tainan, Taiwan, China [2]Department of Interior Design, Tung Fang Design University, Kaohsiung, Taiwan, China [3]Department of Engineering Science, National Cheng Kung University, Tainan, Taiwan, China |
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Abstract: | This study discusses the experimental result of the viscoplastic response and collapse of sharp-notched 316L stainless steel tubes with different notched depths subjected to cyclic bending. The tube bending machine and curvature-ovalization measurement apparatus were used for conducting the symmetric curvature-controlled cyclic bending. To highlight the viscoplastic behavior, three different curvature-rates, 0.0035, 0.035 and 0.35 m?1s?1, were controlled. Observations of a certain curvature-rate reveal that five almost parallel lines corresponding to five different notch-depth (0.2, 0.4, 0.6, 0.8 and 1.0 mm) tubes were presented in the experimental relationship between the cyclic controlled curvature and the number of cycles needed to produce buckling on a log-log scale. However, the slopes for the three different curvature-rates are different. An empirical formulation was proposed to simulate the aforementioned relationship. When comparing with the experimental findings, the simulation was in good agreement with the experimental data. |
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Keywords: | viscoplastic collapse sharp-notched circular tube cyclic bending curvature-rate ovalization |
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