# US 10,369,772 B2 · Method of making core-stiffened structure

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- Number: US 10,369,772 B2
- Document ID: US10369772B2
- Status: Granted
- Kind: B2
- Application number: 15/050,564
- Filed: 2016-02-23
- Published: 2016-06-16
- Granted: 2019-08-06
- Earliest claimed: 2012-07-10
- Assignees: Textron Innovations Inc.
- Applicants: Textron Innovations Inc.
- Inventors: James D. Hethcock, Jr.; Kenneth E. Nunn, Jr.; Carl A. May
- Web page: https://patentgrep.com/patent/US10369772B2

## CPC

- B32B 37/146: {whereby one or more of the layers is a honeycomb structure}
- B32B 3/12: characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 37/12: characterised by using adhesives
- B32B 37/1284: {Application of adhesive}
- B32B 2250/40: Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
- B32B 2605/18: Aircraft
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## Abstract

A method of making a core-stiffened structure includes the steps of providing a honeycomb core having an adhesive disposed on first and second surfaces thereof, providing a first skin and a second skin, and assembling the first skin, the second skin, and the honeycomb core to form the core-stiffened structure. The method further includes the steps of curing the core-stiffened structure and inhibiting at least one of the first skin and the second skin from protruding into at least one cell of the honeycomb core during the step of curing the core-stiffened structure.

## Claims

### Claim 1

A method of making a core-stiffened structure, comprising:
providing a honeycomb core having an adhesive disposed on first and second surfaces thereof;
providing a first skin and a second skin;
assembling the first skin, the second skin, and the honeycomb core to form the core-stiffened structure;
curing the core-stiffened structure; and
inhibiting the first skin and the second skin from protruding into at least one cell of the honeycomb core during the step of curing the core-stiffened structure, comprising:
providing a first stabilization skin in a perforated or porous configuration;
placing the first stabilization skin between the first skin and the first surface of the honeycomb core prior to performing the step of curing the core-stiffened structure;
providing a second stabilization skin in a perforated or porous configuration; and
placing the second stabilization skin between the second skin and the second surface of the honeycomb core prior to performing the step of curing the core-stiffened structure;
wherein the second stabilization skin inhibits the second skin from protruding into the at least one cell of the honeycomb core; and
wherein the first stabilization skin inhibits the first skin from protruding into the at least one cell of the honeycomb core;
wherein the first stabilization skin is substantially fully cured as the core-stiffened structure is assembled;
wherein the first stabilization skin does not contact the second surface of the honeycomb core;
wherein the second stabilization skin does not contact the first surface of the honeycomb core;
wherein the first stabilization skin and the second stabilization skin are secured to the honeycomb core during the step of curing the core-stiffened structure; and
wherein the adhesive is reticulated and thereby allows migration of fluid through the first stabilization skin, the second stabilization skin, and the honeycomb core.