CAJ | 학술논문

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。
목적：타원관건시최상견적원주관건변형상태,통상채용축경방식교원,연구교원과정중영향소성변형적관건삼수。방법건립료타원주관건정원모형,조도료영향절면최대응력치적관건삼수,즉타원도화후도반경비,병진행료무인차화。채용공제변량법,운용비선성유한원연건ABAQUS,모의료불동타원도화후도반경비적타원관건,정원과정중적절면최대응력치。결과통과대비대량수거,득출료타원관정원타원도화반경후도비영향곡선이급소성림계곡선。결론위게시축경교원궤리,완선교원적예측제공료삼고。
Objective Oval tube is the most common deformation of cylindrical tube, which is usually set round by radi-us 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 dimension-less. 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.