Total Fatigue Life Assessment of Complicated Structures

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N68335-12-C-0311
Agency Tracking Number: N12A-006-0271
Amount: $79,999.00
Phase: Phase I
Program: STTR
Awards Year: 2012
Solicitation Year: 2012
Solicitation Topic Code: N12A-T006
Solicitation Number: 2012.A
Small Business Information
11 Alscot Drive, East Lyme, CT, 06333-
DUNS: 610056405
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
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
 Northwestern University
 David Chopp
 M448, Technological Institute
2145 Sheridan Road
Evanston, IL, 60208-3125
 (847) 491-8391
 Nonprofit college or university
Abstract
Global Engineering and Materials, Inc. (GEM) along with its team members Northwestern University, Lockheed Martin, and Boeing Company, propose to develop an automatic software tool for 2D/3D fatigue crack growth prognosis of complicated structures under multi-axial loading. The XFAT toolkit will be developed by integrating a unified crack initiation and propagation model with an enhanced mesh independent extended finite element toolkit (XFA) for ABAQUS. A direct mesh independent crack path tracking will be used for a 2D crack while a fast and robust level set characterization and update will be implemented for an arbitrary 3D crack and its growth. To accurately determine the mixed mode fracture parameters, an interaction integral will be implemented for the direct computation of mixed-mode stress intensity factors. A unified crack initiation and propagation solution module will be developed for the total fatigue life assessment. The proposed technique permits crack initiation or arbitrary insertion of initial cracks, independent of a base 3D model, and allows non-self-similar crack growth pattern without conforming to the existing mesh or local remeshing. Verification and validation of both 2D/3D fatigue crack growth modules for Abaqus will be performed using test data collected from LM/Boeing and from GEMs existing Navy sponsored programs.

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

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