The Boeing Company

Commonwealth Scientific and Industrial Research Organisation

Stephen Christensen

Jonathan Henry Gosse

Jeffrey S Wiggins

Samuel J Tucker

Mostafa Rassaian

Eric J Stober

Diane C Rawlings

James Senger

Jay O Rakel

Russell John Varley

Nguyen Buu Dao

David S Nansen

Terry L Schneider

Wendy Wenjun Tian

Donald K Dabelstein

Donald J Ayers

Terrence Lee Schneider

Dale E Hartz

Larry E Dolan

Todd R Peterson

Michael A Walker

Robert C Anderson

James S Senger

Jonathan H Gosse

The present disclosure relates to epoxide containing compounds comprising three benzene units linked by bridging groups. The disclosure also relates to the production of curable epoxy resin formulations comprising said epoxide containing compounds, and their possible incorporation into composite materials such as fibre reinforced composites. Possible methods for formulating the compounds epoxide containing compounds, as described herein, are also disclosed.

Epoxy resin

A method of forming a composite structure including coupling a plurality of components together forming a joint: wherein the plurality of components are oriented to form a radius gap therebetween: forming a filler structure that includes a closed cell foam core that has a porosity within a range defined between about 20 percent and about 40 percent by volume of the closed cell foam core and wherein the closed cell foam core is formed from a silicone-based material. The method also includes positioning the filler structure in the radius gap: and applying at least one of heat or pressure to the plurality of components and the filler structure.

Methods of forming composite structures

Methods and formulations for distortional thermosets are disclosed that display enhanced composite mechanical performances and robust sorption resistance. The composition includes an epoxy resin of formula (I): and a diamine curing agent. The resultant distortional thermoset compositions possess superior out-life requirements and advantageous reaction kinetics for preparing prepreg compositions and materials.

Formulation methodology for distortional thermosets

A method of analyzing the durability of a structure. Load-controlled testing is performed on samples of a composite material of the structure to relate critical strain invariants of the material to cyclic rates of strain invariant accumulation and frequencies associated with the cyclic rates. The material is characterized based on effective properties of the material, including the cyclic rates of strain invariant accumulation. Laminate properties and a geometrical definition of the structure are used to obtain a parametric model. Material characterizations are used to determine model element frequency responses to applied load conditions. Each element's frequency responses and critical strain invariants are used to determine whether damage is indicated at the element. Progression of damage is tracked and accounted for in the model.

Analyzing structural durability in the frequency domain

A composite structure that includes a plurality of components coupled together forming a joint, wherein the plurality of components are oriented such that a gap is defined at least partially therebetween. The composite structure also includes a filler structure positioned in the gap. The filler structure includes a honeycomb core including side walls that define a plurality of core cells, and an amount of resin within each of the plurality of core cells. The honeycomb core side walls facilitate restricting crack propagation in the resin from spreading between adjacent pairs of the plurality of core cells.

Composite structure and method of forming thereof

An array of aerodynamic riblets is created by a plurality of high stiffness tips with a layer supporting the tips in predetermined spaced relation and adhering the tips to a vehicle surface.

Amorphous metal riblets

A composite structure is provided. The composite structure includes a plurality of components coupled together forming a joint, wherein the plurality of components are oriented such that a gap is defined at least partially therebetween. A filler structure is positioned in the gap, and the filler structure includes a closed cell foam core.

A fiber-reinforced resin composite and method of making the same. The fiber-reinforced resin composite includes a polymeric resin matrix and a plurality of fibers coated with a first distortional polymeric resin. The polymeric resin matrix has a first von Mises strain. The first distortional polymeric resin has a second von Mises strain in a range of approximately 0.25 to approximately 0.45. The plurality of fibers coated with the first distortional polymeric resin are disposed in the polymeric resin matrix. The second von Mises strain is greater than the first von Mises strain.

Fiber-reinforced resin composites and methods of making the same

A method, apparatus, and computer program product are present for creating a composite structure. A number of characteristics for a number of components for the composite structure is obtained from a simulation of the composite structure using a model of the composite structure. A number of changes in the number of characteristics needed to meet a desired level of performance for the number of characteristics is ascertained. A number of attributes for a number of composite materials used to form the number of components corresponding to the number of characteristics having the number of changes is identified. The number of attributes for the number of composite materials for the number of characteristics having the number of changes based on the desired level of performance is changed.

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Sammamish, WA, United States of America

Stephen Christensen