| 非对称型材弯曲拉伸失稳及最小弯曲半径研究 |
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| 引用本文： | 宋江腾,臧勇,崔福龙,崔丽红.非对称型材弯曲拉伸失稳及最小弯曲半径研究[J].机械强度,2010,32(2). |
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| 作者姓名： | 宋江腾 臧勇 崔福龙 崔丽红 |
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| 作者单位： | 北京科技大学机械工程学院,北京,100083 |
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| 基金项目： | supported by the National Natural Science Foundation of China(No.50775010) |
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| 摘 要： | 以槽型材为例,借助塑性力学分析手段,对非对称型材弯曲过程中拉伸失稳问题进行研究。分析非对称型材弯曲时出现分散性失稳和集中性失稳时的应变强度。为避免出现拉伸失稳现象,提出非对称型材最小弯曲半径的计算方法。最后通过实际算例,将解析解与数值模拟结果进行比较分析。结果表明,型材在弯曲状态下,发生分散性失稳的应变强度小于集中性失稳,它与应力分布状态和材料硬化指数有关。最小弯曲半径与材料力学性能和截面尺寸有关。
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| 关 键 词： | 失稳 翼缘 非对称型材 中性层 |
STUDY ON TENSILE INSTABILITY AND THE MINIMUM BENDING-RADIUS IN BENDING PROCESS OF ASYMMETRICAL PROFILE |
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| SONG JiangTeng,ZANG Yong,CUI FuLong,CUI LiHong.STUDY ON TENSILE INSTABILITY AND THE MINIMUM BENDING-RADIUS IN BENDING PROCESS OF ASYMMETRICAL PROFILE[J].Journal of Mechanical Strength,2010,32(2). |
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| Authors: | SONG JiangTeng ZANG Yong CUI FuLong CUI LiHong |
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| Affiliation: | School of Mechanical Engineering/a>;University of Science and Technology Beijing/a>;Beijing 100083/a>;China |
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| Abstract: | Based on the example of U-section profile,the tensile instability in the bending process of asymmetrical profile was studied by plastic mechanics.The strain intensity of diffuse instability and localized instability were analyzed.In order to avoid tensile instability,the formula to calculate the minimum bending-radius of asymmetrical profile was presented.Through a practical example,the simulation results were compared with analytical solution.The results indicate that the strain intensity of diffuse instab... |
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| Keywords: | Instability Flange Asymmetrical profile Neutral layer |
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