The Boeing Company

Theboeing Company

William B H Grace

Kay Youngdahl Blohowiak

Jeong-Beom Ihn

Robert A Anderson

Edward McMurray Fisher, Jr

Jonathan Henry Gosse

Wesley L Holman

James Robert Schnelz

Randy Jay Grove

Matthew Anthony Dilligan

Derek J Fox

Stephen R Barnes

Kenneth M Harrison

Christopher T Allen

Patrick D Bertrand

Menelaos S Kafkalidis

Matthew S Tillman

Joe M Walters

Brice Thompson Collamer

A test coupon having node bonds is disclosed. In some aspects, the method includes a first foil and a second foil, stripes of adhesive serially disposed across a width of the first foil or the second foil and coupling the first foil and second foil to one another to form node bonds, and a first adherend coupled to the first foil and a second adherend coupled to the second foil such that the first foil and the second foil are provided between the first adherend and the second adherend, the first adherend and the second adherend being connectable to load blocks of a test apparatus capable of loading the test coupon to determine characteristics of each of the node bonds formed from the stripes of adhesive. A method for testing node bonds and a related apparatus are also disclosed.

Test coupons having node bonds, methods for testing node bonds, and related apparatuses

The disclosure provides in one embodiment a system for monitoring adhesive integrity within a cured bondline of a bonded structural assembly. The system comprises a bonded structural assembly having a cured bondline. The cured bondline comprises an adhesive layer, a scrim ply layer integrated with the adhesive layer, and an electrical sensor network integrated with the scrim ply layer. The system further comprises an electrical power source for providing electrical power to the electrical sensor network. The system further comprises a digital data communications network for retrieving and processing data from the electrical sensor network. The electrical sensor network monitors adhesive integrity on demand by interpreting changes in local dynamic responses and electromechanical properties directly measured within the cured bondline.

System and method for monitoring bonding integrity

A structural member such as a strut includes a composite material tube having metal end fittings that are attached to the tube by co-bonded, double shear joints. The double shear bond joint construction reduces the residual stress on the bonds that result from mismatch of the coefficients of thermal expansion of the composite tube and the metal end fittings. The ends of the fittings that are bonded to the tube may include a stepped profile that functions to limit the peak stresses in the bonds.

Composite tube having co-bonded end fittings

The present invention provides a metallic member reinforcing epoxy-based adhesive coating. The epoxy-based adhesive coating including a first epoxy material containing approximately 25% solids by weight and a second curative material containing about 32% solids by weight. According to one aspect of the present invention, the first epoxy offered suitably includes about 3% to about 35% liquid Diglycidylether of Bisphenol-A, about 35% to about 60% solid Diglycidylether of Bisphenol-A, about 10% to about 30% Novolac-Epoxy, and about 5% to about 18% Solid Carboxy&mdash;Terminated Acrylonitrile&mdash;Butadiene Rubber, and the second curative material suitably includes about 0% to about 100% 4,4&prime;-Diaminodiphenylsulfone, about 0% to about 100% 3,3&prime;-Diaminodiphenylsulfone, and about 0% to about 0.2% Chromium octoate.

Fiber-metal laminate adhesive coating

Growing community of inventors

Seattle, WA, United States of America

William B H Grace