| 斜轧零件应力应变特征与内部低周疲劳损伤机制 |
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| 引用本文： | 杨海波,张立杰,马国华,胡正寰.斜轧零件应力应变特征与内部低周疲劳损伤机制[J].北京科技大学学报,2003,25(6):563-567. |
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| 作者姓名： | 杨海波 张立杰 马国华 胡正寰 |
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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： | 国家自然科学基金;50035010; |
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| 摘 要： | 采用ANSYS／LS—DYNA软件，建立了斜轧零件基本变形过程的三维有限元分析模型，对不同工况下的斜轧过程进行了计算机数值模拟分析，仿真结果揭示了斜轧过程中轧件内部应力应变场的分布规律；导致Mannesmann缺陷的主要原因是在发生大塑性应变变形情况下，金属内部在承受交变应力作用下产生低周疲劳损伤和破坏。
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| 关 键 词： | 斜轧零件 应力 应变 低周疲劳 损伤机制 内部缺陷 金属成形 |
| 修稿时间： | 2003年2月25日 |
Characteristic Stress-Strain and Damage Mechanism of Workpiece Due to Low Cycle Fatigue in Skew Rolling |
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| YANG Haibo,ZHANG Lijie,MA Guohua,HU Zhenghuan
Mechanical Engineering School,University of Science and Technology Beijing,Beijing ,China.Characteristic Stress-Strain and Damage Mechanism of Workpiece Due to Low Cycle Fatigue in Skew Rolling[J].Journal of University of Science and Technology Beijing,2003,25(6):563-567. |
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| Authors: | YANG Haibo ZHANG Lijie MA Guohua HU Zhenghuan
Mechanical Engineering School University of Science and Technology Beijing Beijing China |
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| Institution: | YANG Haibo,ZHANG Lijie,MA Guohua,HU Zhenghuan
Mechanical Engineering School,University of Science and Technology Beijing,Beijing 100083,China |
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| Abstract: | The 3-dimension finite element models of tool and workpiece in the skew rolling process were built up with ANSYS/LS-DYNA. Computer simulations on the ladder shaft in skew rolling under different parameters were conducted. According to the simulation results, the stress and strain of workpiece in the skew rolling were obtained and the forming mechanism of interior defects in the billet were studied. A explanation to the mechanism of Mannesmann effect is that low cycle fatigue damage, in the condition of deformation with large plastic strain, occurs inside the workpiece due to the alternately-changing stress and strain. |
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| Keywords: | metal forming skew rolling low cycle fatigue interior defect simulation |
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