Evaluation of Environmentally Aged Polymer/Composite Material by Ultrasonic Inspection.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1991
- Accession Number
- ADA235343
Entities
People
- Robert F. Anastasi