The Boeing Company

Aaron N Rinn

Lyle Ray Deobald

Madhavadas Ramnath

Ying Shan

Kenneth Harlan Griess

Jeffrey Hayden Olberg

Derek Paul Vetter

Kevin Earl McCrary

Matthew Anthony Dilligan

Haozhong Gu

Michael Jeffrey Graves

Chi Ho Eric Cheung

Lyle R Deobald

Kevin E Mccrary

An open-channel stiffener for stiffening a panel has a bonding flange for bonding the stiffener to the panel through a bondline formed between the bonding flange and the panel to form a stiffened panel. The open-channel stiffener has a cross-sectional shape that aligns, or substantially aligns, a shear center of the stiffener with a centroid of the stiffener and aligns the shear center proximate an edge of the bondline, and removes the need for a radius filler noodle. A plurality of perforations may be formed through the bonding flange to permit an adhesive to wick into the perforations and create a mechanical interlock between the bonding flange and the panel.

Open-channel stiffener

Method for measuring residual strain in a cured composite part includes taking a first image of at least two spaced apart particles positioned on a side of the cured composite part with the side positioned transverse to a first face side. The cure composite part includes a first ply has fibers and a second ply has fibers wherein the first ply and the second ply are positioned in overlying relationship to one another. At least a portion of the fibers of the first ply are positioned in angular relationship with at least a portion of the fibers of the second ply. The at least two spaced apart particles are associated with the second ply. Further included is a step of removing at least a portion of the first ply and taking a second image of the at least two spaced apart particles.

Method for measuring residual strain for cured composite part

A composite structure having a base charge and an outer channel charge is provided. The outer channel charge has an inner radius and an outer radius. A charge of plies adjacent to the inner radius reduces the inner radius.

Composite structures having reduced area radius fillers and methods of forming the same

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Edmonds, WA, United States of America

Aaron N Rinn