ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Generalized fatigue damage is derived based on S-N curve under constant amplitude loadswith S characterizes the load cycle by the combination of load peak and load amplitude. For randomfatigue loads, a natural choice is to use half cycle (Range) counting method. Rain Flow counting ispopular due to its useful nature to pick-out full cycles among random loads. It is found in the presentresearch through analysis and verified by experimental results that Rain Flow counting seriouslyoverestimate the damage for the actual true random loads owing to its inherent nature and the Rangecounting method is more reliable. As the filtering threshold increases gradually, the overestimationeffect by Rain Flow counting method becomes less, and the calculated damages by Rain Flow andRange counting begin to converge. The filtering threshold damage corresponding to the “fatiguelimits” for the concerned case was calculated. According to equal damage principle, the filteringthreshold amplitudes were derived and found to vary with the load peaks. In practice, an acceptablesolution is to use quasi-variable filtering thresholds
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.1161.pdf
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