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