Accession Number : ADD011912

Title :   Simultaneous Incremental Strain/Incremental Temperature Analog Device for, and Method, of Testing for Stress Response.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Bills,K W , Jr ; Svob,G J

Report Date : 18 Jun 1985

Pagination or Media Count : 9

Abstract : A device for, and a method of, applying an incremental strain to a test specimen of a solid propellant which is at the stress-free temperature, while simultaneously subjecting the test specimen to an incremental temperature change above and below the stress-free temperature. The device includes a frame assembly in which a captive strain multiplier is used to apply the thermally induced loads to the test specimen of the solid propellant that is mounted within the device. Temperature changes, above or below the stress-free temperature, cause volume changes of the rubber members of the strain multiplier and result in the strain multiplier axially loading the mounted test specimen in simulation of the loading conditions that occur in a case-bonded solid rocket grain. When the temperature is raised, the rubber members expand and exert an axial compressive load on the mounted specimen; and, when the temperature is lowered, the rubber members contract and exert an axial tensile load on the mounted specimen. (Author)

Descriptors :   *PATENTS, *ROCKET PROPELLANT GRAINS, *SOLID ROCKET PROPELLANTS, *STRESS TESTING, STRAIN(MECHANICS), TEMPERATURE, ANALOG SYSTEMS, THERMAL STRESSES, VOLUME, RUBBER, TRANSITIONS, LOADS(FORCES), COMPRESSIVE PROPERTIES, TENSILE STRESS, CASE BONDING, SIMULATION

Subject Categories : Solid Rocket Propellants

Distribution Statement : APPROVED FOR PUBLIC RELEASE