Accession Number : ADD000094

Title :   Cumulative Fatigue Life Indicator.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Petrisko,Edwin M ; Keller,Karl H ; Keller,Penny C

Report Date : 11 Dec 1973

Pagination or Media Count : 5

Abstract : The purpose of the patent is accumulation and display of information indicative of expended and remaining fatigue life of a test specimen or pressure vessel. Strain-gauge output signals are amplified by a dual channel conditioning circuit. The dual channel bipolar strain signals are then used to compute the alternating stress range absolute value on a continuous basis. Voltage signals proportional to the alternating stress are then presented to a counter which registers the individual accumulated stress cycles with reference to the total allowable cycles in thousandths of counts and provides a usage factor indicating cumulative fatigue damage and remaining fatigue life.

Descriptors :   *Fatigue life, *Indicating instruments, *Patents, Strain gages, Structures, Fatigue(Mechanics)

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE