Total Fatigue Life Assessment of Complicated Structures

Award Information
Agency:
Department of Defense
Branch
Navy
Amount:
$149,977.00
Award Year:
2012
Program:
STTR
Phase:
Phase I
Contract:
N68335-12-C-0309
Award Id:
n/a
Agency Tracking Number:
N12A-006-0040
Solicitation Year:
2012
Solicitation Topic Code:
N12A-T006
Solicitation Number:
2012.A
Small Business Information
3190 Fairview Park Drive, Suite 650, Falls Church, VA, -
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
010983174
Principal Investigator:
Subhasis Sarkar
Senior Engineer
(703) 237-1300
ssarkar@tda-i.com
Business Contact:
Scott Bradfield
President
(703) 226-4061
sbradfield@tda-i.com
Research Institution:
University of California, Irvine
Craig Behrens
5171 California Avenue
Suite 150
Irvine, CA, 92697-7600
(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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