Accession Number : ADD015077

Title :   Fixtureless Environmental Stress Screening Apparatus.

Descriptive Note : Patent, Filed 2 Nov 89, patented 13 Aug 91,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Chalmers, Richard H

Report Date : 13 Aug 1991

Pagination or Media Count : 9

Abstract : A fixtureless environmental screening device is provided for the testing of mechanical, electromechanical and electrical devices. The apparatus uses a relatively incompressible fluid having a high heat capacity and a high heat of vaporization to transfer heat and vibration to a device to be tested. The heat transfer characteristics of the fluid permits a device tested to undergo rapid temperature change while being simultaneously subjected to vibrational cycling. By utilizing a fluid as a vibration transmission medium expensive fixtures are avoided so that devices of a wide variety of shapes and sizes may be readily tested. The dielectric properties of the working fluid permits energization of electrical devices during the course of vibration and temperature cycling.

Descriptors :   CAPACITY(QUANTITY), CYCLES, DIELECTRIC PROPERTIES, ELECTRICAL EQUIPMENT, ENVIRONMENTS, FLUIDS, HEAT TRANSFER, HIGH TEMPERATURE, INCOMPRESSIBILITY, STRESSES, TEMPERATURE, THERMAL CYCLING TESTS, TRANSMITTANCE, VAPORIZATION, VIBRATION

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE