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| 椭圆管件正圆过程影响塑性极限的关键参数探析 |
| Analysis of Key Parameters of the Plastic Limit during Round Setting of Oval Tube |
| Received:July 10, 2014 Revised:September 01, 2014 |
| DOI：10. 3969 /j. issn. 1674-6457. 2014. 05. 018 |
| 中文关键词: 椭圆 管件 椭圆 度 半径厚度比 屈服应力 缩颈正圆 |
| 英文关键词: oval tube ovality radius to thickness ratio yield stress necking down round setting |
| 基金项目: |
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| 中文摘要: |
| 目 的 椭圆 管件是最常见的圆 柱管件变形状态, 通常采用 缩径方式矫圆 , 研究矫圆 过程中 影响塑性变形的关键参数。 方法 建立了 椭圆 柱管件正圆 模型, 找到 了 影响截面最大应力 值的 关键参数, 即椭圆 度和厚度半径比, 并进行了 无因 次化。 采用 控制 变 量法, 运用 非 线 性有限元软件ABAQUS, 模拟了 不同 椭圆 度和厚度半径比的椭圆 管件, 正圆 过程中 的截面最大应力 值。 结果 通过对比大量数据, 得出 了 椭圆 管正圆 椭圆 度和半径厚度比影响曲线以及塑性临界曲线。 结论 为揭示缩径矫圆 机理, 完善矫圆 的预测提供了 参考。 |
| 英文摘要: |
| Objective Oval tube is the most common deformation of cylindrical tube, which is usually set round by radius shrinkage. The aim of this paper is to investigate the key parameters influencing the plastic deformation during the round setting process. Methods This paper established round setting model for cylindrical tube, identified the key parameters that affected the value of the maximal stress, the ovality and the thickness to radius ratio, and the model was made dimensionless. Using the variable controlling method and the nonlinear finite element software ABAQUS, oval tubes with different ovality and thickness to radius ratios were simulated, achieving the maximal stress values during the round setting process. Results By comparing large amounts of data, influencing curve of perfect circle ovality and radius to thickness ratio of the oval tube and the plastic critical curve were obtained. Conclusion The study provided reference for revealing the radius shrinkage round setting mechanism and improving the prediction of round setting. |
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