초록 ▼

We reduce core crush and ply wrinkling in composite honeycomb sandwich structure by preventing slipping of tiedown plies relative to the mandrel and to one another during autoclave curing. We produce superior panels with lighter weights, improved mechanical properties, and more predictable structura

We reduce core crush and ply wrinkling in composite honeycomb sandwich structure by preventing slipping of tiedown plies relative to the mandrel and to one another during autoclave curing. We produce superior panels with lighter weights, improved mechanical properties, and more predictable structural performance. The method involves applying a film adhesive to the tiedown plies in the margin of the part outside the net trim line. During heating of the autoclave and prior to the application of high pressure to the composite structure, the film adhesive cures to form a strong bond between the plys and to the mandrel. When pressure is applied, the tiedown plys are locked together and to the mandrel to prevent slippage between any layers in the panel.

대표청구항 ▼

A method for adhering tiedown plies together in the manufacture of composite structure, comprising the steps of: (a) assembling on the layup mandrel a composite preform in the shape of the composite structure, the preform having at least one resin-impregnated laminate and at least two tiedown plies;

A method for adhering tiedown plies together in the manufacture of composite structure, comprising the steps of: (a) assembling on the layup mandrel a composite preform in the shape of the composite structure, the preform having at least one resin-impregnated laminate and at least two tiedown plies; and (b) adhering the tiedown plies to one another with a film adhesive applied to the plies outside a net trim line of the composite structure wherein the film adhesive cures at a temperature lower than the resin in the laminate.