AN EDDY-CURRENT MODEL FOR THREE-DIMENSIONAL NONDESTRUCTIVE EVALUATION OF ADVANCED COMPOSITES

Award Information
Agency:
Department of Defense
Branch
Navy
Amount:
$249,479.00
Award Year:
1985
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Agency Tracking Number:
931
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Sabbagh Associates, Inc.
4639 East Morningside Dr, Bloomington, IN, 47401
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Harold A. Sabbagh
(812) 339-3446
Business Contact:
() -
Research Institution:
n/a
Abstract
THE PROPOSED RESEARCH PROBLEM IS TO DEVELOP A MODEL AND AN INVERSION ALGORITHM THAT IS SUITABLE FOR THE THREE-DIMENSIONAL QUANTITATIVE NON-DESTRUCTIVE EVALUATION (NDE) OF ADVANCED COMPOSITE MATERIALS BY USING EDDY-CURRENTS. THE APPROACH THAT WE PROPOSE IS BASED ON, AND EXTENDS, WORK THAT HAS ALREADY BEEN PERFORMED BY ANALYTICS, INC. FOR EDDYCURRENT NDE OF CONVENTIAL METALS. THE TECHNICAL OBJECTIVES ARE TO DETERMINE THE FEASIBILITY OF USING MULTIFREQUENCIES FOR THIS JOB, TO DETERMINE IN LOCALIZED REGIONS THE FIBER-RESIN RATIO IN GRAPHICS EPOXY AND TO DETERMINE MORE PRECISELY THE TYPES ANOMALIES, WHETHER FLAWS, DELAMINATIONS, BROKEN FIBERS, ETC., THAT CAN BE RECONSTRUCTED BY OUR INVERSION METHOD. THESE OBJECTIVES CAN BE MET BY; (1) APPLYING RIGOROUS ELECTROMAGNETIC THEORY TO DETERMINE A GREEN'S FUNCTION FOR A STRATIFIED HALF-SPACE OF ANISOTROPIC COMPOSITE MATERIALS, (2) DETERMINING THE INTEGRAL RELATIONS FOR THE DIRECT AND INVERSE PROBLEMS, USING THE GREEN'S FUNCTION JUST DERIVED, (3) DETERMINING SUITABLE NUMERICAL ALGORITHMS FOR SOLVING THE INVERSE PROBLEM, AND (4) WRITING A COMPUTER PROGRAM TO EXECUTE THE MODEL.

* information listed above is at the time of submission.

Agency Micro-sites

US Flag An Official Website of the United States Government