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

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA8650-05-M-3528
Agency Tracking Number: F051-248-3195
Amount: $99,947.00
Phase: Phase I
Program: SBIR
Awards Year: 2005
Solitcitation Year: 2005
Solitcitation Topic Code: AF05-248
Solitcitation Number: 2005.1
Small Business Information
109 MacKenan Drive, Cary, NC, 27511
Duns: 030936335
Hubzone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Alexander Bogdanovich
 VP of RD
 (919) 481-2500
Business Contact
 Andrew Watson
Title: Controller/Corp Secretary
Phone: (919) 481-2500
Research Institution
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 introduces several novel design concepts of bonded lap joints, butt joints, integral composite D-joint elements and other similar connectors, all based on the use of 3-D woven and 3-D braided fabric preforms. Unique manufacturing processes used in production of such preforms enable to split them into two or more thinner sheets or branches, hybridize different fiber types within 3-D architectures, continuously vary cross-sectional shapes. Using complex shape 3-D textile preforms with gradual variation of thermo-mechanical properties for composite joints of interest will allow, as anticipated, to significantly reduce stress peaks and mitigate the negative effects of joining dissimilar materials. Design and manufacturing of special fabric preforms, fabrication of experimental composite joints samples and their experimental evaluation will be supported by 3-D micromechanics modeling and predictive analysis of stress/strain fields, crack propagation and thermo-mechanical response. 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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