RESEARCH PAPER
The Use of Spectral Method for Fatigue Life Assessment for Non-Gaussian Random Loads
1
Faculty of Mechanical Engineering, Department of Mechanics and Machine Design, Opole University of Technology, ul. Mikołajczyka 5, 45-271 Opole, Poland
2
Department of Engineering, University of Perugia, via G. Duranti, 93, Perugia, 06125 Italy
Submission date: 2015-05-04
Acceptance date: 2016-05-12
Online publication date: 2016-06-08
Publication date: 2016-06-01
Acta Mechanica et Automatica 2016;10(2):100-103
KEYWORDS
ABSTRACT
The well-known problem with the fatigue lifetime assessment of non-Gaussian loading signals with the use of spectral method has been presented in the paper. A correction factors that transform the non-Gaussian signal into an equivalent Gaussian signal proposed by Bracessi et al. (2009) has been used for the purpose of lifetime calculations together with Palmgren-Miner Hypothesis. The calculations have been performed for the 10HNAP steel under random non-Gaussian load with four dominating frequencies. The signal has been generated on the test stand SHM250 for random tension-compression tests. The results with zero and non-zero mean stresses have been used to calculate the fatigue life with the frequency domain method based on Dirlik’s model and with a time domain method with the use of the rainflow cycle counting algorithm. The obtained calculation results have been compared with experimental results.
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| eISSN: | 2300-5319 |
| ISSN: | 1898-4088 |
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