A NOVEL APPLICATION OF ULTRASONIC TOMOGRAPHY FOR POROSITY DISTRIBUTION MAPPING IN COMPOSITES

Award Information
Agency:
Department of Defense
Branch
Navy
Amount:
$50,000.00
Award Year:
1989
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
10244
Agency Tracking Number:
10244
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
108 W Montgomery Ave, North Wales, PA, 19454
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Alex S Redner
(215) 661-0100
Business Contact:
() -
Research Institution:
n/a
Abstract
CONVENTIONAL ULTRASONIC NONDESTRUCTIVE EVALUATION IS CAPABLE OF DETECTING POROSITY IN RESIN-MATRIX COMPOSITES, BUT CANNOT EVALUATE THE POROSITY DISTRIBUTION, NOR EVEN EVALUATE RELIABLY THE PROPER POROSITY PERCENTAGE. THIS STUDY IS PROPOSED TO DEVELOP AN ULTRASONIC TOMOGRAPHY TECHNIQUE FOR MAPPING THE POROSITY DISTRIBUTION IN RESINMATRIX COMPOSITES. THE BASIS OF THE PROPOSED APPROACH IS TO USE THE TOMOGRAPHICAL PRINCIPLE TO EXTRACT THE LOCAL PROROSITY LEVEL FROM THE AVERAGE VELOCITY OR ATTENUATION VALUES MEASURED ALONG MANY SETS OF PARALLEL PROPAGATION PATHS. RELIABLE EMPIRICAL RELATIONSHIPS BETWEEN VELOCITY OR ATTENUATION AND POROSITY WILL BE FIRST ESTABLISHED FOR SAMPLES OF UNIFORM POROSITY. THE INVESTIGATION WILL NOT BE RESTRICTED ONLY TO LONGITUDINAL-WAVE NORMAL INCIDENCE, BUT WILL ALSO INCLUDE SHEAR-WAVE AND WAVEGUIDE MODES TO BE EXCITED AT OBLIQUE INCIDENCE. THE DEVELOPED TECHNIQUE WILL THEN BE TESTED ON SAMPLES OF ARBITRARY POROSITY DISTRIBUTION TO DETERMINE ITS TECHNICAL FEASIBILITY. THE FINAL OUTPUT IS EXPECTED TO BE A SPATIAL MAPPING OF THE POROSITY DISTRIBUTION.

* information listed above is at the time of submission.

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