The Boeing Company

Stuart A Smith

Darrell H Corbett

Panagiotis Emanuel George

Dave G Erickson

Ryan C Mortensen

An apparatus and method for retaining composite structures, such as composite honeycomb structures, during manufacture are provided. The composite structure is cured on a mandrel that defines a layup surface with a grip feature. The grip feature is configured to engage the composite structure during manufacture and retain the structure in a predetermined configuration. A film adhesive can be provided between the grip feature and a tiedown ply that extends from the composite structure.

Mandrel and method for manufacturing composite structures

We reduce core crush in honeycomb sandwich structure by using a peripheral tiedown ply, generally in combination with a scrim-reinforced barrier film, between the composite laminate and the core along the panel chamfer to prevent slipping of the barrier film and outer laminates relative to the core during curing. We produce superior panels with lighter weights, improved mechanical properties, and more predictable structural performance.

Growing community of inventors

Kent, WA, United States of America

Stuart A Smith