空腹型材压弯过程的失稳研究

Bending of rectangular hollow sections aluminum profile

空腹型材压弯过程中的极限压弯半径与型材几何参数有关,现基于有限元模拟软件DEFORM-3D,首先模拟得出一定尺寸范围内矩形空腹铝合金型材的极限压弯半径,然后将其与TIMOSHENKO S P的理论预测结果进行比较,并分析了差别出现的原因,最后提出了可扩展用于多元函数关系的数据整理方法,结合模拟所得数据给出了该范围内其他尺寸矩形空腹型材极限弯曲半径的预测方法,对压弯过程中的腹板变形预测以及压弯模具设计有一定的指导意义。

During the press bending process of hollow sections, the critical bending radius is associated with the geometric parameters of the sections. The critical press bending radius of a rectangular aluminum hollow section within a certain size range was simulated based on finite element software DEFORM-3D and compared with the theoretical prediction result based on Timoshenko SP. The reason of difference between two methods was analyzed. Then a data reduction way used for the relations of function of several variables was proposed, and the method to predict the critical bending radius of other rectangular hollow sections within the size ranges was put forward based on the simulated data. This will help to predict the buckling of web plate in the bending process and be a reference to the design of bending dies.