Accession Number : AD0736885

Title :   Ultrasonic Method of Determining the Shear Resistance of Hydraulic Fluids and Lubrication Oils (II),

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Wislicki,Bogdan ; Karpinski,Wieslaw

Report Date : 06 DEC 1971

Pagination or Media Count : 31

Abstract : A description is given of an ultrasonic method based on acoustically induced cavitation effects for studying the resistance of hydraulic fluids and lubrication oils to the action of mechanical shear forces. The effectiveness of the method was studied as a function of power (up to 200 W) and frequency (10,15, and 20 kHz) using acoustical concentrators in the form of an exponential horn, a disk ended exponential horn, a stepped cylindrical concentrator, and a chamber concentrator. Shearing efficiency was determined photographically. The ultrasonic method was compared for mineral and synthetic oils with pump slot techniques using injection pumps and gear pumps. The shear kinetics are analyzed, and relations are given for calculating viscosity on the basis of a given shear time. (Author)

Descriptors :   (*LUBRICANTS, NONDESTRUCTIVE TESTING), (*HYDRAULIC FLUIDS, NONDESTRUCTIVE TESTING), ULTRASONIC RADIATION, TEST METHODS, PHOTOGRAPHY, CAVITATION, VISCOSITY, DENSITY, MATHEMATICAL ANALYSIS, POLAND

Subject Categories : Lubricants and Hydraulic Fluids
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE