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

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N00014-11-C-0487
Agency Tracking Number: N10A-041-0527
Amount: $740,681.00
Phase: Phase II
Program: STTR
Awards Year: 2011
Solicitation Year: 2010
Solicitation Topic Code: N10A-T041
Solicitation Number: 2010.A
Small Business Information
11 Alscot Drive, East Lyme, CT, -
DUNS: 610056405
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Jim Lua
 President
 (860) 367-4970
 jlua@gem-innovation.com
Business Contact
 Jim Lua
Title: President
Phone: (860) 367-4970
Email: jlua@gem-innovation.com
Research Institution
 The University of Texas at EL Paso
 Jack Chessa
 University of Texas at El Paso
Mechanical Engineering Dept.
El Paso, TX, 79968-
 (915) 747-6900
 Nonprofit college or university
Abstract
A software toolkit for Abaqus (XSHELL) will be developed for fracture evaluation and load deflection prediction of welded aluminum ship structures subjected to impulsive loading. The mesh independent crack description and fracture energy dissipation will be achieved in XSHELL through the implementation of two overlay elements with an embedded cohesive interaction along an arbitrary crack segment without in conformation to the existing finite element mesh. In addition to the implemented Belytschko-Tsay shell elements, new XFEM shell elements will be developed in their triangular and quadrilateral formats that better capture the kinematics of warped elements and curvature. Modified Mohr-Coulomb and a Johnson Cook models coupled with a nonlocal failure theory will be implemented to capture the nonlinear fracture initiation in aluminum alloys. A mixed mode cohesive and crack growth direction law will be used to drive the subsequent crack propagation and its associated energy dissipation. Global Engineering and Materials, Inc. (GEM) has commitments for technical support from Professor Jack Chessa at The University of Texas at El Paso, Professor Ted Belytschko from Northwestern University, and Professor Robert Dodds from University of Illinois at Urbana-Champaign. To help commercialize the XSHELL technology, GEM has also secured endorsement and support from Alcoa and NOV (National Oilwell Varco).

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

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