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Bonded Joint Analysis Method
Navy STTR FY2012.A
| Sol No.: |
Navy STTR FY2012.A |
| Topic No.: |
N12A-T004 |
| Topic Title: |
Bonded Joint Analysis Method |
| Proposal No.: |
N12A-004-0072 |
| Firm: |
NextGen Aeronautics
2780 Skypark Drive
Suite 400
Torrance, California 90505 |
| Contact: |
Akhilesh Jha |
| Phone: |
(310) 995-4859 |
| Web Site: |
www.nextgenaero.com |
| 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 |
| Benefits: |
In the defense sector, the final product will be helpful in designing lighter structures and potentially lead to more lethal defense system at a reduced cost. Lighter structures are especially desired in aerospace systems. The simulation tool developed under this effort will be also useful in designing the lighter commercial aircrafts and automobiles in public sector. The developed software can be sold as an add-on module to current commercial software tools such as ANSYS, ABAQUS, etc. |
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