| Summary: | 碩士 === 國立成功大學 === 工程科學系 === 104 === In this study, the finite element software ANSYS Workbench 15.0 is used to analyze the mechanical response of local sharp-dented 6061-T6 aluminum alloy tubes submitted to symmetrical curvature-controlled cyclic bending. The mechanical response includes the moment-curvature and ovalization-curvature relationships, the dent depths are 0, 0.3, 0.6, 0.9 and 1.2 mm, the controlled curvature is ±0.4 m-1. According to the analysis result, the moment-curvature curves show a stable loop for tubes with or without a dent. However, the ovalization-curvature curves exhibit an increasing and ratcheting manner with the number of cycles. By comparing the analysis result for different dent depths, the moment-curvature curves reveal almost no influence by the variation of dent depths. But the ovalization-curvature curves show a symmetrical trend for tubes without a dent and unsymmetrical trend for tubes with a dent. In addition, deeper dent depths lead to more sever unsymmetrical trend and faster increase of ovalization. Finally, by comparison of the ANSYS analysis and the experimental finding, it can be found that the ANSYS analysis can properly simulate the experimental data.
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