Reliability Assessment of Nondestructive Evaluation via Eddy-Current Model-Based Inversion

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA8650-08-M-5217
Agency Tracking Number: F081-033-0290
Amount: $99,980.00
Phase: Phase I
Program: SBIR
Awards Year: 2008
Solicitation Year: 2008
Solicitation Topic Code: AF081-033
Solicitation Number: 2008.1
Small Business Information
P.O. Box 7706, Bloomington, IN, 47407
DUNS: 074529467
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 (812) 339-8273
Business Contact
 Harold Sabbagh
Title: President
Phone: (812) 339-8273
Research Institution
The reliability of nondestructive evaluation (NDE) techniques is currently determined through probability-of-detection (POD) studies that rely on measurments of actual hardware copies of representative flaws. There is now a need to eliminate the inefficiencies and expenses of this method by using model-based standards derived from sophisticated engineering computer codes, that are, in turn, derived from rigorous applications of physical theories. This proopsal applies the concept of model-based inversion that is based upon Victor Technologies' well-known eddy-current code, VIC-3D(c), to solve the problem of reliably assessing NDE techniques. We will introduce the notion of `Probability of Inversion,' and show that the classical model-assisted POD (MAPOD) becomes a simple corollary to it. Furthermore, we will develop a rigorous electromagnetic model for anisotropic media, such as Ti-6Al-4V, which is a titanium alloy that is widely used in aerospace structures and engines. With these concepts we effectively enter the `digital age' of eddy-current NDE, leaving traditional emphasis on analog instruments behind.

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

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