Innovative Joining and Repair Methodologies Using Hybrid Textile Preforms

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N00014-07-M-0440
Agency Tracking Number: N074-021-0395
Amount: $69,990.00
Phase: Phase I
Program: STTR
Awards Year: 2007
Solicitation Year: 2007
Solicitation Topic Code: N07-T021
Solicitation Number: N/A
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
 Alex Bogdanovich
 VP of Research
 (919) 481-2500
 bogdanovicha@3TEX.COM
Business Contact
 Andrew Watson
Title: Controller
Phone: (919) 481-2500
Email: watsona@3tex.com
Research Institution
 TEXAS A&M
 Ozden Ochoa
 3406 TAMU
188 Bizzell, 006 Wisenbaker
College Station, TX, 77843 3406
 (979) 845-2022
 Nonprofit college or university
Abstract
Strength, durability and reliability of commonly used bonded and bolted composite-to-metal structural joints suffer from sharp geometry variations, mismatch of elastic properties, coefficients of thermal expansion and thermal conductivity of the adherends, altogether causing high stress concentration and premature failure of adhesive bonded joints. The proposed work offers substantial enhancement of composite-to-metal bonded joints (including lap and butt joints, joints of composite skins and stiffeners, D-joint elements and other similar connectors) and metal repair with composite patches. The primary focus is on joining steel structural components to glass and carbon fiber 3-D woven and 3-D braided fabric preforms and composites. The two key features of this joining methodology are: (1) using hybrid preforms which incorporate metal filaments, multi-filament yarns, wires or cables and (2) welding or brazing such preforms to the metallic structures. The implementation of this new concept of composite-to-metal joining and metal repair 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 performed and supported by 3-D micromechanics modeling and predictive analysis of stress/strain fields, progressive failure, and fracture.

* information listed above is at the time of submission.

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