The Boeing Company

Kenneth L Brook

Michael A Lee

John Dempsey Morris

Lyle Ray Deobald

Gregory B Doty

Timothy D Jackson

Donald Paul Matheson

Bonnie Ann Keefe

Kenneth J Duffie

Niraj Patel

Kenneth John Duffié

Kenneth John DuffiÉ

The disclosure herein provides for disbond resistant stringer runouts. Various aspects may be used independently or in combination to mitigate disbonding associated with the stiffener runout under operational loads. Aspects include a stiffener runout having rounded base flange corners. A recessed notch may be incorporated within the base flange to provide a flange termination point that is forward of the web termination point, allowing the web to terminate prior to the base flange. The web may be trimmed from a full height to a reduced height at the web termination point. The base flange may be co-bonded to the underlying composite structure via a scarf joint. Perimeter clamp radius fillers may be used to concentrate a clamping force around the perimeter of the base flange.

Disbond resistant composite stiffener runout

The disclosure provides in one embodiment for a vent dam for use in a vent stringer in a fuel vent system. The vent dam is configured to mount to and within the vent stringer The vent dam has a contoured guiding surface for guiding fuel flow into and out of an interior of the vent stringer, wherein the vent dam, the vent stringer, and a tube attached to the vent stringer are in fluid communication with one or more fuel tanks. The vent dam further has one or more side flanges extending from the contoured guiding surface for providing attachment of the vent dam to one or more interior portions of the vent stringer, wherein the contoured guiding surface and the one or more side flanges are formed as one piece.

Fluid dynamic vent dam

A collapsible bladder has flexible outer walls and at least one strut inside the enclosure. The strut is connected to the outer walls and controls the shape into which the enclosure may be collapsed.

Method for producing composite laminates using a collapsible mandrel

A structure may comprise a skin member and a hat stringer. The hat stringer may include a base portion and first and second webs extending outwardly from the base portion. The first and second webs may be formed of a wrap laminate having wrap plies and a cover laminate having cover plies. The first and second webs may be interconnected by a cap. The hat stringer and skin member may be co-cured.

High pulloff capability hat stringer

The disclosure provides in one embodiment for a vent dam for use in a vent stringer in a fuel vent system. The vent dam comprises a contoured guiding surface for guiding fluid flow in a vent stringer. The vent dam further comprises one or more side flanges extending from the contoured guiding surface for providing attachment of the vent dam within the vent stringer.

Method for Producing Composite Laminates Using a Collapsible Mandrel

A stringer comprises a base portion and first and second webs extending outwardly from the base portion. The orientation of at least one of the first and second webs may transition from a first angle to a second angle within an angle transition zone.

Composite stringer with web transition

A structure may comprise a skin member and a hat stringer. The hat stringer may include a base portion and first and second webs extending outwardly from the base portion. Each one of the first and second webs may be comprised of a wrap laminate having wrap plies and a cover laminate having cover plies. The first and second webs may be interconnected by a cap. The hat stringer and skin member may be co-cured.

Growing community of inventors

Seattle, WA, United States of America

Kenneth L Brook