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Composite structure having reinforced core and method of making same

A technology for strengthening cores and cores, which is applied to building structures, chemical instruments and methods, building components, etc., can solve problems such as inability to provide performance, and achieve a wide range of improvement in bonding strength, maintenance of temperature and humidity conditions, and bonding strength Improved effect

Inactive Publication Date: 2009-02-04
THE BOEING CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The framing network described above using carbon fiber / epoxy pins may not provide sufficient performance in some aerospace applications

Method used

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  • Composite structure having reinforced core and method of making same
  • Composite structure having reinforced core and method of making same
  • Composite structure having reinforced core and method of making same

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Embodiment Construction

[0065] Now first refer to figure 1 -9, A composite sandwich structure generally indicated broadly by the reference numeral 30, comprising a reinforcing core 32 sandwiched between and bonded to a pair of outer panels 34,36. Each panel 34, 46 may include multiple layers of fiber reinforced polymer resin layers 38, such as cloth graphite fibers or other forms, held in an epoxy bond.

[0066] The core 32 may broadly include a reinforcing framework 33 held in a carrier, which may include a lightweight low density foam layer 46 . Foam layer 46 may comprise, without limitation, rigid closed foam cells of polymethacrylamide (PMI), known under the trade name ROHACELL ROHACELL It is available in different densities and thicknesses, and has a relatively low coefficient of linear thermal expansion. The foam layer 46 serves to hold the carcass 33 in place during manufacture of the core 32 and also adds somewhat to the structural strength of the core 32 .

[0067] The reinforcement fr...

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Abstract

A polymer-based composite sandwich includes a core bonded between fiber reinforced resin facesheets. The core includes a truss formed by groups of composite pins held in a low density foam. The pins in each group intersect to form nodes adjacent to one of the facesheets. The ends of the pins extend parallel and are bonded to the facesheets.

Description

technical field [0001] The present invention relates generally to composite structures, and more particularly to composite sandwich elements having a reinforced core, and methods of making such composite sandwich elements. Background technique [0002] Composite sandwich structures can be strengthened by placing structural stiffeners in a core bonded between two face sheets. The core reinforcement may include structural elements that define load paths for transferring compressive, tensile and shear loads between the face sheets. The performance of a composite sandwich depends in part on the type of core reinforcement and the quality of the bond between the core and face sheets. Common core materials may include rigid plastic foam and honeycomb. Although honeycomb cores exhibit good structural efficiency, they may be subjected to high core-to-panel loads in certain situations, such as during long-duration space flights, where a pressure differential is created between the c...

Claims

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Application Information

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IPC IPC(8): B32B3/22B32B3/06B32B5/18B32B37/02
CPCY10T428/249923Y10T428/24149E04C2002/3488E04C2/3405E04C2/296B32B7/08B32B27/34B32B37/12B32B37/15B32B2260/046Y02T50/40
Inventor 巴德哈德夫·查克拉巴蒂
Owner THE BOEING CO
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