中文摘要：

基于ABAQUS／Explicit有限元软件平台，建立0Cr21Ni6Mn9N不锈钢管数控弯曲成形过程三维弹塑性有限元模型，对建模关键技术进行了处理，并对其可靠性进行了验证；模拟分析了几何参数和材料参数对弯管截面畸变的影响规律。结果表明，随着弯曲角度、相对管径的增大或相对弯曲半径的减小，截面畸变率增大；随着强度系数、屈服强度的增大或硬化指数、弹性模量的减小，截面畸变率增大。截面畸变率最大值出现在沿弯曲方向30°附近的区域，其位置不受几何参数和材料参数大小的影响。研究结果对提高管材数控弯曲成形质量及成形极限具有指导意义。

英文摘要：

Based on the platform of ABAQUS/Explicit, a 3D elastic-plastic finite element modeI of numerical control （NC） ben- ding process of 0Cr21Ni6MngN stainless steel tube was established. Key technological problems were solved and its reliability was validated. Then, simulation and analysis of the process were carried out and the influence laws of geometry and material pa- rameters on section distortion were obtained. Results show that the rate of section distortion increases with the increase of ben- ding angle, relative tube diameter or the decrease of relative bending radius. The rate of section distortion increases with the in- crease of strength factor, yield strength or the decrease of strain hardening exponent, elastic modulus. The maximum rate of section distortion presents in the vicinity of the bending angle 30° along the bending direction and its position does not change with the change of geometry and material parameters. The results can provide an important guideline for improving forming quality and forming limit of the tube during NC bending.