Fracture Evaluation and Design Tool for Welded Aluminum Ship Structures Subjected to Impulsive Dynamic Loading

Award Information
Agency:
Department of Defense
Branch
Navy
Amount:
$70,000.00
Award Year:
2010
Program:
STTR
Phase:
Phase I
Contract:
N00014-10-M-0254
Award Id:
95179
Agency Tracking Number:
N10A-041-0527
Solicitation Year:
n/a
Solicitation Topic Code:
NAVY 10T041
Solicitation Number:
n/a
Small Business Information
11 Alscot Drive, East Lyme, CT, 06333
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
610056405
Principal Investigator:
JimLua
President
(609) 356-5115
jlua@gem-consultant.com
Business Contact:
JimLua
President
(609) 356-5115
jlua@gem-consultant.com
Research Institute:
The University of TX at EL PASO
Jack Chessa
Dept. of Mechanical Engineerin
500 W. University Ave.
EL Paso, TX, 79968
(915) 747-6900

Abstract
A software tool for fracture evaluation and load deflection prediction of welded aluminum ship structures subjected to impulsive loading will be developed by enhancing and integrating an existing extended finite element method (XFEM) for dynamic fracture of thin shells in Abaqus. The software package will be able to model arbitrary crack paths as dictated by the physics of the scenario, completely independent of the mesh. This will be accomplished by adding discontinuous displacement and velocity fields arbitrarily within the shell elements via two superposed elements with a set of phantom degrees of freedoms. Explicit time integration with one point quadrature scheme and an hourglass control will be implemented to further simplify the treatment of cracked elements and provide consistent history variables for nonlinear material models. A modified Johnson-Cook model coupled with a nonlocal fracture criterion will be implemented to capture an anisotropic and rate dependent nonlinear material behavior and its associated damage initiation. Global Engineering and Materials, Inc. (GEM) has secured commitments for technical support from the University of Texas at El Paso (UTEP) and Professor Ted Belytschko from Northwestern University (NWU). Dr. Belytschko will provide GEM his stand alone explicit dynamic XFEM tool for shells.

* information listed above is at the time of submission.

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