Comprehensive Bonded Joint Analysis Method

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N68335-12-C-0386
Agency Tracking Number: N12A-004-0029
Amount: $149,887.00
Phase: Phase I
Program: STTR
Awards Year: 2012
Solicitation Year: 2012
Solicitation Topic Code: N12A-T004
Solicitation Number: 2012.A
Small Business Information
4020 Long Beach Blvd, Long Beach, CA, -
DUNS: 133626544
HUBZone Owned: N
Woman Owned: Y
Socially and Economically Disadvantaged: N
Principal Investigator
 Daniel Hammerand
 Senior Engineer
 (562) 981-7797
Business Contact
 Kevin Roughen
Title: Vice President of Enginee
Phone: (562) 981-7797
Research Institution
 Sandia National Laboratories
 Mike Chiesa
 P.O. Box 969
Livermore, CA, 94551-0969
 (925) 294-2103
 Federally funded R&D center (FFRDC)
M4 Engineering, Inc. and Sandia National Laboratories propose to create a unique bonded joint analysis and design software tool. Surrogate traction-separation models will be created that efficiently capture the behavior that occurs for real bonded joints. Mixed mode loading, including compressive normal tractions and relative displacements will be captured and used in an extended cohesive zone element to be developed and implemented in ABAQUS using its user subroutine interface. The mathematical forms for the surrogate traction-separation interface models will be developed and populated using high fidelity numerical models which include explicitly modeled adhesive layers. These models will utilize the nonlinear viscoelastic constitutive equation for polymers developed at Sandia. This material law captures the complete range of polymer behavior which cannot be captured fully by any known plasticity model. Furthermore, not only is this model useful for simulating variable thermal histories, it is also useful for predicting both adhesive and cohesive failure of polymer epoxies, as shown in the literature. An experimental program necessary to fully populate the high fidelity models and validate the surrogate traction-separation models will be delineated. Successful execution of this proposal will allow a commercially viable software tool to be developed in Phase II.

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

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