Buckling and wrinkling of rectangular hollow sections curved in three-point-roll bending

Curved aluminium extrusions are applied in a wide range of industrial applications. Because initially straight, an additional process is required to curve the product. Undesired wrinkling plate part at inner radius frequently observed during curving process. Wrinkling has already been extensively studied for rotary-draw bending This paper aims predicting conditions which hollow section can occur three-point-roll It shown that most important condition buckling compressed occurs. An analytical prediction model presented, predicts critical as function slenderness. The validated with finite element model, turn experiment. Both and experiment confirm does not if exceeds predicted radius.