椭圆管件正圆过程影响塑性极限的关键参数探析

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。

Analysis of Key Parameters of the Plastic Limit during Round Setting of Oval Tube

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.