Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1989-05-11
1990-05-01
Raevis, Robert R.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
G01N 332
Patent
active
049208071
ABSTRACT:
A method for obtaining fatigue life information for an article is disclosed. Initially, an area of interest is determined on the article. A durability schedule is defined for that article as a predetermined number of passes through each of a predetermined number of events, each of the events being defined by the generation of strains in the article having a predetermined range of magnitudes and frequencies. A total effective damage factor caused to the component by one pass through each of the events is next determined, which permits the determination of a total durability factor for all of passes for all of the events defined in the durability schedule. The article is then tested by subjecting it a plurality of passes through all of the events defined in the durability schedule until a termination criteria is reached. Then, a total actual damage factor can be determined based upon the number of tested passes through each of the events defined in the durability schedule. A final durability factor for the article is lastly determined by dividing the total actual damage factor by the total durability factor. A plurality of final durability factors can be used to obtain the desired fatigue life information.
REFERENCES:
SAE Technical Paper No. 680084, Lipson et al., (1968).
SAE Technical Paper No. 861849, Kececioglu et al., (1986).
Muldowney Robert M.
Stokes Richard S.
Dana Corporation
Raevis Robert R.
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