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Total Fatigue Life Assessment of Complicated Structures

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N68335-12-C-0309
Agency Tracking Number: N12A-006-0040
Amount: $149,977.00
Phase: Phase I
Program: STTR
Solicitation Topic Code: N12A-T006
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): 2013-11-29
Small Business Information
3190 Fairview Park Drive Suite 650
Falls Church, VA -
United States
DUNS: 010983174
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Subhasis Sarkar
 Senior Engineer
 (703) 237-1300
 ssarkar@tda-i.com
Business Contact
 Scott Bradfield
Title: President
Phone: (703) 226-4061
Email: sbradfield@tda-i.com
Research Institution
 University of California, Irvine
 Craig Behrens
 
5171 California Avenue Suite 150
Irvine, CA 92697-7600
United States

 (949) 824-3787
 Nonprofit College or University
Abstract

SIF and non-SIF based approaches are used to study the damage/crack growth involving complex crack shapes under complicated loading conditions. In the SIF based approach, we use alternating, non-hypersingular Symmetric Galerkin Boundary Element Method (SGBEM)-Finite Element Method (FEM) formulation to study both 3D and 2D crack growth situations. This technique enables study of surface or embedded 3D cracks growing in non-coplanar mode, 2D through crack growing in non-collinear way, and transitioning of 3D into 2D cracks. A large number of benchmark problems will be solved to validate the methodology and case studies will be conducted to demonstrate proposed method"s superiority. In the non-SIF based approach, we explore the use of Peridynamics to study fracture processes and application to fatigue problems. Peridynamics is a non-local approach , where material particles exert influence within a neighborhood distance as opposed to the classical local approach. The most important part in Peridynamics is in the formulation of constitutive laws to express the bond forces between material points. Owing to its formulation expressed in integral forms, it is well suited to discontinuities such as cracks. In this study, we explore linking continuum damage mechanics models with Peridynamics for applications involving HCF and composites.

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

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