Frequency-domain approach for fatigue damage estimation and lifetime prediction of mechanical components is often used for its computational efficiency and the capability to give a synthetic representation of a random process. The problem with the approach is that the input data, the stress power spectral density (PSD), may not include the information about potential small amount of high amplitude cycles which can substantially increase the accumulated fatigue damage. The paper investigates the scatter of the accumulated damage in generated random stress histories and compares them to the results obtained by a frequency-domain approach—the Dirlik method. The results show a possibility of a severe underestimation of accumulated damage when using frequency-domain approach. In case a typical stress, history of a certain mechanical component includes sporadic high amplitude cycles their effect shoud be taken into consideration when using frequency-domain approach.
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July 2014
Research-Article
Critical Evaluation of Frequency-Domain Approach for Fatigue Damage Estimation
Gašper Vidic,
Gašper Vidic
Faculty of Mechanical Engineering,
e-mail: gasper.vidic@fs.uni-lj.si
University of Ljubljana
,Aškerčeva 6
,Ljubljana SI-1000
, Slovenia
e-mail: gasper.vidic@fs.uni-lj.si
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Marko Nagode
Marko Nagode
Faculty of Mechanical Engineering,
e-mail: marko.nagode@fs.uni-lj.si
University of Ljubljana
,Aškerčeva 6
,Ljubljana SI-1000
, Slovenia
e-mail: marko.nagode@fs.uni-lj.si
Search for other works by this author on:
Gašper Vidic
Faculty of Mechanical Engineering,
e-mail: gasper.vidic@fs.uni-lj.si
University of Ljubljana
,Aškerčeva 6
,Ljubljana SI-1000
, Slovenia
e-mail: gasper.vidic@fs.uni-lj.si
Marko Nagode
Faculty of Mechanical Engineering,
e-mail: marko.nagode@fs.uni-lj.si
University of Ljubljana
,Aškerčeva 6
,Ljubljana SI-1000
, Slovenia
e-mail: marko.nagode@fs.uni-lj.si
Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received April 18, 2013; final manuscript received May 28, 2014; published online June 12, 2014. Assoc. Editor: Mohammed Zikry.
J. Eng. Mater. Technol. Jul 2014, 136(3): 031008 (7 pages)
Published Online: June 12, 2014
Article history
Received:
April 18, 2013
Revision Received:
May 28, 2014
Citation
Vidic, G., and Nagode, M. (June 12, 2014). "Critical Evaluation of Frequency-Domain Approach for Fatigue Damage Estimation." ASME. J. Eng. Mater. Technol. July 2014; 136(3): 031008. https://doi.org/10.1115/1.4027792
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