Accession Number : AD0607235

Title :   APPLICATIONS OF ULTRASONICS TO ABLATION STUDIES.

Descriptive Note : Technical memo.,

Corporate Author : AVCO CORP WILMINGTON MASS RESEARCH AND ADVANCED DEVELOPMENT DIV

Personal Author(s) : Lynnworth,L. C.

Report Date : 27 OCT 1961

Pagination or Media Count : 9

Abstract : Ultrasonic measurement of ablation rate during re-entry is possible, with accuracies dependent on the material and trajectory. Studies of the variables that tend to frustrate ultrasonic ablation-rate measurements reveal certain aspects of the ablation mechanism that may remain undetected, if not for their influence on ultrasonic response. Ultrasonic observations permit one to draw conclusions concerning char depth, and departures from steady-state ablation. Investigation of properties on which the ablation mechanism depends often overlooks the need for proper identification of test specimens, including identification of defects. Ultrasonic evaluation of test specimens is nondestructive, and therefore economically alleviates this problem. (Author)

Descriptors :   (*ABLATION, MEASUREMENT), (*ULTRASONIC RADIATION, ABLATION), (*TEST METHODS, ABLATION), REENTRY VEHICLES, NONDESTRUCTIVE TESTING, HEAT SHIELDS, THICKNESS, SURFACE PROPERTIES, RUPTURE, THERMODYNAMICS

Distribution Statement : APPROVED FOR PUBLIC RELEASE