DETERMINING FIBER VOLUME FRACTION AND POROSITY IN ORTHOTROPIC COMPOSITE LAMINATES

Award Information
Agency:
Department of Defense
Branch
Army
Amount:
$48,776.00
Award Year:
1987
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
5594
Agency Tracking Number:
5594
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
2001 Priestley Ave, Norman, OK, 73069
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
KARL H BERGEY
(405) 364-4212
Business Contact:
() -
Research Institution:
n/a
Abstract
ULTRASONIC NONDESTRUCTIVE TESTING HAS BECOME THE METHOD OF CHOICE FOR THE QUALITY ASSURANCE OF ADVANCED COMPOSITE MATERIALS. THE PROPOSED RESEARCH PROGRAM COVERS THE DEVELOPMENT OF A COMPUTER-BASED NDT METHOD FOR DETERMINING LOCAL FIBER VOLUME FRACTION AND RESIN POROSITY IN PRACTICAL LAMINATED COMPOSITES. THE COMPUTER ALGORITHMS WILL BE BASED ON EARLIER STUDIES THAT HAVE BEEN SUCCESSFUL FOR UNIDIRECTIONALLY REINFORCED COMPOSITES. THEY DEPEND ON SIMULTANEOUS MEASUREMENTS OF TWO ULTRASONIC WAVE VELOCITIES USING IMMERSION TRANSDUCERS. THE SPECIFIC OBJECTIVES OF THE PHASE I STUDY ARE TO DEVELOP A DETAILEDMODEL FOR WAVE PROPAGATION AT OBLIQUE INCIDENCE ANGLES, CHECK THE ANALYTIC MODEL EXPERIMENTALLY, AND MODIFY EXISTING ALGORITHMS FOR FIBER FRACTION AND POROSITY DETERMINATION IN COMPLEX LAMINATES. ADDITIONAL GOALS INCLUDE THE DESIGN AND TESTING OFFIXTURES TO HOLD THE REQUIRED TRANSDUCER ASSEMBLIES AND THE TESTING OF PRACTICAL LAYUPS (WITH SHAPE AND LAMINATION VARIATIONS) TO VERIFY THE PROCEDURE.

* information listed above is at the time of submission.

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