Accession Number : AD0486768
Title : ULTRASONIC WAVE PROPAGATION AND INTERACTION IN SOLID MATERIALS.
Descriptive Note : Final rept. 29 Dec 64-1 Dec 65,
Corporate Author : MIDWEST RESEARCH INST KANSAS CITY MO
Personal Author(s) : Rollins, Fred R., Jr.
Report Date : APR 1966
Pagination or Media Count : 29
Abstract : The ultrasonic reflectivity of a liquid-solid interface has been shown to be a sensitive indicator of physical properties of the solid. At angles of incidence slightly less than that which produces total reflection, the reflectivity often falls off sharply with a minimum occurring at some angle angle of incidence. The value of angle of incidence and the reflectivity at angle of incidence are both frequency dependent. It is often possible to find a frequency, frequency, which causes the reflectivity to approach zero at the minimum. Under these conditions, it is found that frequency, angle of incidence, and the reflection amplitude are all extremely sensitive to slight variations in such surface properties as elastic moduli, grain orientation or texture, attenuation, and degree of cold work. In addition, the technique can be used to detect and measure the properties of thin coatings or cladding on thicker substrates. Simplicity and ease of application combined with inherent sensitivity make the technique a potentially powerful tool in nondestructive testing and material evaluation.
Descriptors : (*ULTRASONIC RADIATION, SOLIDS), (*SOLIDS, NONDESTRUCTIVE TESTING), SOUND, PROPAGATION, LIQUIDS, SURFACE PROPERTIES, COATINGS, MEASUREMENT, REFLECTIVITY, PHYSICAL PROPERTIES, ANISOTROPY, PLASTIC PROPERTIES, ELASTIC PROPERTIES, COLD WORKING.
Subject Categories : Acoustics
Distribution Statement : APPROVED FOR PUBLIC RELEASE