Accession Number : AD0163581

Title :   High-Frequency Viscoelastic Vibrator.

Descriptive Note : Patent,

Corporate Author : OFFICE OF THE SECRETARY OF THE ARMY WASHINGTON D C

Personal Author(s) : McDonald,Patrick H. ; Blake,Henry W. ; Myers,Guy A. ; Pugh,Claud E. ; Todd,Edward S.

Report Date : 11 JAN 1972

Pagination or Media Count : 8

Abstract : The invention relates to vibratory apparatus for the purpose of measuring relevant and significant materials properties through a wide range of frequency and temperature such as the investigation of the behavior of viscoelastic materials under high-frequency excitation. An object of the invention is a high-frequency viscoelastic vibrator for obtaining meaningful data on the high-frequency properties and behavior of viscoelastic substances. Specifically, the apparatus of the invention permits taking such data sufficient to characterize the volumetric (dilational) and shear (distortional) spectral tensor operators which relate to stress, stress rate, and higher derivates of stress to the strain, strain rate, and higher derivates of strain under general states of stress for viscoelastic materials in the frequency range of a few hundred Hertz to upwards of 50 kiloHertz.

Descriptors :   (*VISCOELASTICITY, TEST EQUIPMENT), (*NONDESTRUCTIVE TESTING, ULTRASONIC RADIATION), (*TEST EQUIPMENT, *PATENTS), STRESSES, STRAIN(MECHANICS)

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE