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
Awards Year: 2012
Solitcitation Year: 2012
Solitcitation Topic Code: N12A-T006
Solitcitation Number: 2012.A
Small Business Information
Technical Data Analysis, Inc.
3190 Fairview Park Drive, Suite 650, Falls Church, VA, -
Duns: 010983174
Hubzone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
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
 (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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