CRITICAL ANGLE ULTRASONIC TESTS

Technical Report · Tue Dec 31 04:00:00 EST 1963

OSTI ID:4054010

Fitch, Jr, C E; Chettle, B W

It has been shown that boundary waves are generated by ultrasound incident at the critical angles on interfaces between acoustically dissimilar media. The presence of these waves, which travel along the interface and have shaHow penetration, causes some unusual perturbations in the reflected waves. A reflected beam, for example, suffers a lateral shift along the interface and a redistribution of energy across the beam. These effects have been demonstrated and used to measure Zircaloy-2 surface hydride in amounts as small as 300 ppm. Compressive surface strains of about mu in./in. in brass and 300 to 500 mu in./ in. in aluminum were also detected. A maximum strain of about 500 mu in./in. in sthinless steel did not produce a measurable effect. Boundary wave generation was shown to exist also for solid-solid irterfaces. A frequency of 5 Mc was used throughout the experiments; at this frequency the waves penetrated to a depth about haif way between the shear and longitudinal wavelengths. These experiments, though preliminary, have shown that critical angle tests with boundary waves may provide a new use for ultrasound in nondestructive testing. (auth)

• Research Organization: General Electric Co. Hanford Atomic Products Operation, Richland, Wash.
• DOE Contract Number: AT(45-1)-1350
• NSA Number: NSA-18-018014
• OSTI ID: 4054010
• Report Number(s): HW-79928
• Country of Publication: United States
• Language: English

Related Subjects

ABSORPTION
ALUMINUM
BRASS
CONFIGURATION
COPPER ALLOYS
DEFORMATION
DETECTION
ENERGY
ENGINEERING
ERRORS
FREQUENCY
IMPURITIES
MATERIALS TESTING
MEASURED VALUES
QUANTITY RATIO
REFLECTION
SENSITIVITY
SOLIDS
SPECTRAL SHIFT
STAINLESS STEELS
SURFACES
ULTRASONICS
ZINC ALLOYS
ZIRCALOY
ZIRCONIUM HYDRIDES