Novel Structural Joining Concepts Using 3-D Textile Preforms and Composites

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA8650-06-C-3615
Agency Tracking Number: F051-248-3195
Amount: $749,962.00
Phase: Phase II
Program: SBIR
Awards Year: 2006
Solicitation Year: 2005
Solicitation Topic Code: AF05-248
Solicitation Number: 2005.1
Small Business Information
3TEX, INC.
109 MacKenan Drive, Cary, NC, 27511
DUNS: 030936335
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Alexander Bogdanovich
 VP for R&D, 3TEX Inc.
 (919) 481-2500
 bogdanovicha@3tex.com
Business Contact
 Andrew Watson
Title: Controller
Phone: (919) 481-2500
Email: watsona@3tex.com
Research Institution
N/A
Abstract
Strength and durability of commonly used bonded and bolted composite-to-composite and composite-to-metal structural joints suffer from sharp geometry variations, mismatch of elastic moduli, Poisson’s ratios, coefficients of thermal expansion and thermal conductivity of the adherends, altogether causing high stress concentration and premature joint failure. The proposed work is focused on development of several novel design concepts and manufacturing methods for composite-to-composite and composite-to-metal joints, including lap and butt joints, joints of composite skins and stiffeners, Ð-joint elements and other similar connectors. All of them are based on the use of hybrid 3-D woven and 3-D braided fabric preforms which incorporate metal filaments, multi-filament yarns, or wires. Dry preforms or composites that include these metal elements on specified surface(s) can be welded or brazed to another preforms or composites of a similar nature, or to solid metal elements. Using this new concept of joining will allow, as anticipated, to significantly increase strength and durability of dissimilar material joints. Design and manufacturing of special fabric preforms, fabrication of experimental joints samples and their experimental evaluation will be supported by 3-D micromechanics modeling and predictive analysis of stress/strain fields, progressive failure, and fracture phenomena. The combined experimental and theoretical effort will be used to validate the efficiency of proposed joining concepts.

* information listed above is at the time of submission.

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