Location

Ithaca, NY

Start Date

1978 12:00 AM

Description

Standard samples containing defects of known size, shape, and· location are requirements for the evaluation and calibration of NDE test equipment. Here we review the methods developed f~r producing such samples from selected metallic alloys and ceramics. In the work with metallic alloys, the method of diffusion bonding Ti-6Al-4V is presented in some detail and is illustrated for a large number of samples containing a variety of defects ranging from spherical cavities and inclusions, to prolate and oblate spheroids, to thin discs and simulated cracks. In the work with ceramics, the method of hot pressing of glasses with cavities and inclusions is illustrated for a variety of defects. The presentation demonstrates how these samples may be applied in a procedure for calibrating ultrasonic systems by employing a recently proposed characteristic equation for the system and a figure-of-merit for the transducers in analogy to the gain of a radar antenna.

Book Title

Proceedings of the ARPA/AFML Review of Progress in Quantitative NDE

Chapter

8. New Technology Roots

Pages

331-335

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

New Ultrasonic Standards

Ithaca, NY

Standard samples containing defects of known size, shape, and· location are requirements for the evaluation and calibration of NDE test equipment. Here we review the methods developed f~r producing such samples from selected metallic alloys and ceramics. In the work with metallic alloys, the method of diffusion bonding Ti-6Al-4V is presented in some detail and is illustrated for a large number of samples containing a variety of defects ranging from spherical cavities and inclusions, to prolate and oblate spheroids, to thin discs and simulated cracks. In the work with ceramics, the method of hot pressing of glasses with cavities and inclusions is illustrated for a variety of defects. The presentation demonstrates how these samples may be applied in a procedure for calibrating ultrasonic systems by employing a recently proposed characteristic equation for the system and a figure-of-merit for the transducers in analogy to the gain of a radar antenna.