Paper number 1106

IN-SITU ULTRASONIC IMAGING OF CF/PEEK DURING DELAMINATION CLOSURE AT ELEVATED TEMPERATURE

C. Miyasaka1, B. R. Tittmann1, and F. Costanzo1

1Department of Engineering Science and Mechanics
The Pennsylvania State University
227 Hammond Building, University Park, PA 16802, USA

Summary In this article, we present a technique for in-situ imaging of the delamination as it is being "healed" at elevated temperatures. This report presents results on the modification of the Scanning Acoustic Microscope (SAM) for in-situ observations of material changes at intermediate temperatures (up to 500C) Described are the key problems and their solutions (i.e., the thermal protection of the transducer and the peripheral equipment, the acoustic lens design for elevated temperature, the scanning mechanism, and the coupling medium). The intermediate temperature SAM was used to image the healing process of internal defects of a CF/PEEK composite caused by soft body impact. The results clearly demonstrate the usefulness of the SAM imaging with temperature control to high enough temperatures to monitor in-situ materials undergoing changes in the internal structure. The technique is completely non-destructive and lends itself for field development.
Keywords scanning acoustic microscope, intermediate temperature, in-situ observation, delamination.

Theme : NDE and Reliability ; Ultrasonic Inspection

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