本文通过实验研究,指出伸长类曲面翻边过程中底部的起皱是由压应力引起的。而侧壁的起皱则是剪应力引起的,它是压应力起皱和非均匀拉应力起皱之外的又一种起皱形式。 In this paper, through experimental research, it is pointed out that the wrinkling at the bottom of the curling process is caused by compressive stress. The wrinkling of the side wall is caused by shear stress, which is another wrinkle form besides compressive and non-uniform tensile stress wrinkling.