Accession Number:

ADA235343

Title:

Evaluation of Environmentally Aged Polymer/Composite Material by Ultrasonic Inspection.

Descriptive Note:

Final rept.

Corporate Author:

ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB

Personal Author(s):

• Anastasi, Robert F.

Report Date:

1991-03-01

Pagination or Media Count:

26.0

Abstract:

Ultrasonic nondestructive evaluation NDE techniques are being explored for application in monitoring the deterioration of glass fiber reinforced polymer matrix composite materials. Conventional ultrasonic equipment and testing arrangements were used that consisted of transducer, materials sample, and coupling medium gel for contact and water for immersion methods. The sound generated by the transducer propagates through the coupling, into the sample, and is reflected from acoustic interfaces flaws, material discontinuities, and sample surfaces. These reflections are either received by another transducer using a through transmission technique or by the sending transducer using a pulse echo technique. A typical A-scan signal time versus voltage display consists of an initial pulse main bang, a front surface echo in water immersion method, and a series of back surface echoes of decreasing amplitude.

Descriptors:

• *COMPOSITE MATERIALS
• *ULTRASONIC TESTS
• COUPLING(INTERACTION)
• NONDESTRUCTIVE TESTING
• INTERFACES
• VOLTAGE
• TRANSMITTANCE
• ECHOES
• ULTRASONICS
• ACOUSTICS
• FRONT ENDS AND SURFACES
• IMMERSION
• DETERIORATION
• DISCONTINUITIES
• TRANSDUCERS
• LIQUID IMMERSION TESTS
• PULSES
• SURFACES
• DISPLAY SYSTEMS
• WATER
• MATERIALS
• POLYMERS

Subject Categories:

• Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE