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

Award Information
Agency:
Department of Defense
Branch
Air Force
Amount:
$99,947.00
Award Year:
2005
Program:
SBIR
Phase:
Phase I
Contract:
FA8650-05-M-3528
Award Id:
73227
Agency Tracking Number:
F051-248-3195
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
109 MacKenan Drive, Cary, NC, 27511
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
030936335
Principal Investigator:
Alexander Bogdanovich
VP of RD
(919) 481-2500
bogdanovicha@3tex.com
Business Contact:
Andrew Watson
Controller/Corp Secretary
(919) 481-2500
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 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.

Agency Micro-sites


SBA logo

Department of Agriculture logo

Department of Commerce logo

Department of Defense logo

Department of Education logo

Department of Energy logo

Department of Health and Human Services logo

Department of Homeland Security logo

Department of Transportation logo

Enviromental Protection Agency logo

National Aeronautics and Space Administration logo

National Science Foundation logo
US Flag An Official Website of the United States Government