Accession Number : ADD005553

Title :   Method of Using Embedded Normal Stress Sensors in Propellant Grains.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON D C

Personal Author(s) : Leeming,Harold

Report Date : 17 Oct 1978

Pagination or Media Count : 5

Abstract : This patent describes an embedded stress sensor gage for use in solid fuel rocket motors and the like consisting of a modified bridge circuit containing temperature sensitive resistive elements and a pair of series connected resistors coupled in parallel with the bridge. A comparison of the voltage at the midpoint of the series connected resistors and the output voltage of the bridge and the voltages at the active resistive elements provides information from which it is possible to determine the change in gage element resistance for each temperature and stress condition. (Author)

Descriptors :   *Patents, *Strain gages, *Propellant grains, Stress analysis, Electric bridges, Circuit analysis, Temperature sensitive elements, Nondestructive testing

Subject Categories : Solid Rocket Propellants

Distribution Statement : APPROVED FOR PUBLIC RELEASE