Innovative Approaches to Flaw-Tolerant Design and Certification of Airframe Components

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N68335-10-C-0428
Agency Tracking Number: N082-131-0118
Amount: $749,946.00
Phase: Phase II
Program: SBIR
Awards Year: 2010
Solicitation Year: 2008
Solicitation Topic Code: N08-131
Solicitation Number: 2008.2
Small Business Information
111 West Port Plaza, Suite 825, St. Louis, MO, 63146
DUNS: 859454886
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Barna Szabo
 President
 (314) 744-5021
 barna.szabo@esrd.com
Business Contact
 Barna Szabo
Title: President
Phone: (314) 744-5021
Email: barna.szabo@esrd.com
Research Institution
N/A
Abstract
The development of a procedural and computational framework for improved prediction of damage accumulation caused by cyclic loading in metallic airframe components is proposed. This framework will be based on the idea that models formulated for the prediction of crack nucleation, i.e., for the purpose of supporting flaw tolerance analysis, and models formulated for the prediction of crack growth, i.e., for the purpose of supporting damage tolerance analysis, are similar in the following sense: In both cases the physical events of interest; crack nucleation and crack growth, are highly nonlinear processes that occur on length scales less than about 0.5 mm for metals used in airframes and are controlled by stress and strain fields computable from mathematical models based on small strain and small deformation theory. Therefore the driving force for damage accumulation can be correlated with functionals that depend on models based on small strain theory. The problem is to identify the functionals that reliably correlate predicted and observed damage accumulation events. The proposed procedural and computational framework will be designed to support this effort.

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

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