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Bonded Joint Analysis Method

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N68335-12-C-0378
Agency Tracking Number: N12A-004-0051
Amount: $79,999.00
Phase: Phase I
Program: STTR
Solicitation Topic Code: N12A-T004
Solicitation Number: 2012.A
Timeline
Solicitation Year: 2012
Award Year: 2012
Award Start Date (Proposal Award Date): 2012-08-15
Award End Date (Contract End Date): N/A
Small Business Information
11 Alscot Drive
East Lyme, CT 06333-
United States
DUNS: 610056405
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Jim Lua
 President
 (860) 398-5620
 jlua@gem-innovation.com
Business Contact
 Jim Lua
Title: President
Phone: (860) 398-5620
Email: jlua@gem-innovation.com
Research Institution
 Virginia Tech
 Romesh C Batra
 
Engineering Sci. and Mechanics Virginia Tech
Blacksburg, VT 24061-
United States

 (540) 231-6051
 Nonprofit College or University
Abstract

A combined discrete cohesive interface fracture and continuum damage mechanics initiation and propagation toolkit for Abaqus will be developed for the residual strength prediction of adhesively bonded composite structures subjected to multi-axial loading. This tool will allow us, for the first time, to be able to simulate concurrently both the continuum and discrete damage progression at the bonded interface and in the adhesive, respectively, under multiaxial loading. To capture the highly nonlinear material constitutive response and the environmentally-driven mechanical properties along the bondline, the adhesive layer will be characterized explicitly without introducing a smearing procedure. An advanced cohesive fracture model will be developed to account for the combined energy dissipation from decohesion, frictional sliding, and yielding. A hydrostatic stress dependent plasticity model coupled with a continuum shell description will be implemented to capture the damage accumulation in a thin adhesive layer subjected to a combined tension/compression/shear loading. Testing will be performed to identify model parameters and to validate the toolkit at coupon and component levels. GEM has secured commitments for technical support from Virginia Tech, Lockheed Martin, Sikorsky, and Air Force Research Lab.

* Information listed above is at the time of submission. *

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