ISSN:
1741-2765
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Some complex aircraft stress histories, steady-state spectra, are noted to induce fatigue-crack growth-rate behavior similar to that observed under constant-amplitude loading. The paper identifies the behavior induced by steady-state spectra, and attributes the behavior to spectrum-stress-event periodicity. Spectrum periodicity is subsequently defined by isolating the group of statistically repetitive stress events. The noted crack-growth-rate behavior that exists for steady-state spectra provides the analyst with new techniques for estimating crack lives. Several crack-life estimating techniques are compared; for the two steady-state spectra considered herein, one technique called the simple-crack incrementation-miniblock approach provides life estimates with the same accuracy as that given by the cycle-by-cycle life-prediction method studied but does so five times more efficiently. The reasons for associated accuracy and efficiency are discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02410350
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