Fiber Composite Preform Forming via Tensioned Clamping

The method applies preliminary tension to the laminate before bending occurs. By clamping the lateral edges of the laminate to the tooling in a tensioned state before the male tool is bent, the laminate is pre-conditioned to resist wrinkling during the subsequent bending operation. This preliminary action of tensioning prevents the formation of wrinkles and kinks at convex curves while allowing the desired bent shape to be achieved.

The method changes the stress state parameter of the laminate from compression to tension during bending. By maintaining the laminate in a tensioned state through clamping the lateral edges to the tooling, the physical condition of the fibers is altered so they remain in tension during bending. This parameter change prevents wrinkling without requiring material removal, thereby preserving the integrity and strength of the flange.

The method applies a counteracting tensile force to the laminate to offset the compressive forces that would normally cause wrinkling during bending. By clamping the lateral edges of the laminate to the tooling in tension, a counterbalancing tension is introduced that opposes the compression generated at convex curves during bending. This counterweight effect prevents wrinkles from forming while allowing the male tool to be bent into the desired geometry.