SYNTHETIC PULSE TECHNIQUE FOR NDE OF THICK FIBER-REINFORCED COMPOSITES

Award Information
Agency:
Department of Defense
Branch
Army
Amount:
$49,663.00
Award Year:
1987
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
6415
Agency Tracking Number:
6415
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
8710 -148th Ave Ne, Redmond, WA, 98052
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
DAVID K THOME
(206) 881-1807
Business Contact:
() -
Research Institution:
n/a
Abstract
THICK FIBER-REINFORCED COMPOSITES WILL BE OBTAINED AND EVALUATED USING AN ADVANCED ULTRASONIC INSPECTION METHOD TO CHARACTERIZE THE MATERIAL FOR CRACKS AND DELAMINATIONS, POROSITY AND DENSITY VARIATIONS. THE ADVANCED ULTRASONIC INSPECTION METHOD IS BASED UPON SYNTHETIC PULSE TECHNOLOGY, WHICH WAS ORIGINALLY DEVELOPED FOR RADAR APPLICATIONS. A SHORT, HIGH ENERGY, BROADBAND PULSE IS REPLACED WITH A MUCH LONGER FREQUENCY-MODULATED BURST, COVERING THE SAME BANDWIDTH WITH MUCH GREATER ENERGY. THIS LEADS TO IMPROVED SENSITIVITY AND RESOLUTION. CONVENTIONAL TRANSIENT-PULSE TECHNIQUES WILL BE USED FOR COMPARISON. ADVANCED AND CONVENTIONAL METHODS WILL BE APPLIED IN BOTH THROUGH-TRANSMISSION AND PULSE-ECHO GEOMETRIES. THROUGH-TRANSMISSION PROVIDES ATTENUATION INFORMATION WHICH CAN BE RELATED TO POROSITY AND TO DENSITY VARIATIONS. PULSE-ECHO INSPECTION PROVIDES SIZE AND LOCATION INFORMATION FOR CRACKS, DELAMINATIONS AND PORES. X-RAY RADIOGRAPHY WILL ALSO BE USED TO PROVIDE ADDITIONAL INFORMATION ON POROSITY AND DENSITY VARIATIONS FOR TECHNIQUE EVALUATION. DESTRUCTIVE TESTING WILL PROVIDE THE NECESSARY INFORMATION TO CORRELATE THE ULTRASONIC AND RADIOGRAPHIC TEST RESULTS AND WILL PROVIDE QUANTITATIVE ASSESSMENT OF THE INSPECTION TECHNIQUES.

* information listed above is at the time of submission.

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