Bonded Joint Analysis Method

Award Information
Agency:
Department of Defense
Branch
Navy
Amount:
$79,954.00
Award Year:
2012
Program:
STTR
Phase:
Phase I
Contract:
N68335-12-C-0377
Award Id:
n/a
Agency Tracking Number:
N12A-004-0072
Solicitation Year:
2012
Solicitation Topic Code:
N12A-T004
Solicitation Number:
2012.A
Small Business Information
2780 Skypark Drive, Suite 400, Torrance, CA, -
Hubzone Owned:
N
Minority Owned:
Y
Woman Owned:
N
Duns:
106823607
Principal Investigator:
AkhileshJha
Principal Investigator
(310) 995-4859
ajha@nextgenaero.com
Business Contact:
ZoltanFeher
Manager, Contracts and Pr
(310) 626-8384
zfeher@nextgenaero.com
Research Institute:
University of California, Berkeley
Patricia Gates
2150 Shattuck Ave., Suite #31
Berkeley, CA, 94704-5940
(510) 642-8109

Abstract
Adhesive bonds are increasingly finding their applications in aerospace and automotive structures. The adhesive bonding gets rid of fasteners, thus reducing stress concentrations and damage initiation sites. In addition, elimination of fasteners results in significant weight savings. In order to use adhesive bonding with confidence and certify integrity of bonded structures, certain issues regarding the integrity of bonded joints need to be addressed. The key issues that need to be addressed are - strength prediction, durability, damage tolerance, and non-destructive inspection. The focus of this study is to quantitatively predict the strength of a general bonded joint under multi-axial loading. The main difficulty with modeling a bonded joint is how to consider a generalized mode of failure emanating from multi-axial loading. In this work, we advance the traditional cohesive zone finite element method by replacing empirical failure criteria of limited traction-displacement curves by stress-based generalized failure criteria obtained from first principle but validated through experiments. While this method does not eliminate the need to experiments, it does provide a comprehensive approach to model failure of bonded joints. Phase I study will also undertake coupon-level tests in order to both inform and validate the method

* 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