Accession Number : AD0434085

Title :   METHOD OF DETERMINING DYNAMIC PROPERTIES OF VISCO-ELASTIC SOLIDS EMPLOYING FORCED VIBRATION,

Corporate Author : COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H

Personal Author(s) : Lee,Tung-Ming

Report Date : NOV 1963

Pagination or Media Count : 16

Abstract : The dynamic properties of visco-elastic solids are evaluated by using the forced longitudanal and torsional vibration techniques. A method of eliminating experimental difficulties due mainly to the coupling of sample with supporting system is introduced in using the maximum amplitude ratio of the free end of a sample to the end attached to a driver and the corresponding vibration frequency as a criterion. Experimental measurements of these values are sufficient to determine the dynamic properties of samples. The complex modulus is used to describe the stress-strain relationship for a visco-elastic solid. In the method presented for alloting the auiplitude ratio and vibration frequency, matchin of natural frequencies of the sample and the driver is not necessary and the same driving unit may be used throughout the experiment. The expressions derived for longitudinal and torsional vibrations bear direct relationship between the measured items and the dynamic properties and are simple to use. (Author)

Descriptors :   (*SOLIDS, MECHANICAL PROPERTIES), VIBRATION, VISCOELASTICITY, STRESSES

Distribution Statement : APPROVED FOR PUBLIC RELEASE