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Open AccessArticle

Influence of the Elastoplastic Strain on Fatigue Durability Determined with the Use of the Spectral Method

Department of Mechanics and Machine Design, Faculty of Mechanical Engineering, Opole University of Technology, Ulica Prószkowska 76, 45-758 Opole, Poland
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Materials 2020, 13(2), 423; https://doi.org/10.3390/ma13020423
Received: 19 December 2019 / Revised: 10 January 2020 / Accepted: 13 January 2020 / Published: 16 January 2020
(This article belongs to the Special Issue Probabilistic Mechanical Fatigue and Fracture of Materials)
The paper presents experimental static and fatigue tests results under random loading conditions for the bending of 0H18N9 steel. The experimental results were used in performing calculations, according to the theoretical assumptions of the spectral method of fatigue life assessment, including elastoplastic deformations. The presented solution extends the use of the spectral method for material fatigue life assessment, in terms of loading conditions, above Hooke’s law theorem. The work includes computational verification of the proposal to extend the applicability of the spectral method of determining fatigue life for the range of elastoplastic deformations. One of the aims of the proposed modification was to supplement the stress amplitudes used to calculate the probability density function of the power spectral density of the signal with correction, due to the plastic deformation and its use for notched elements. The authors have tested the method using four of the most popular probability density functions used in commercial software. The obtained results of comparisons between the experimental and calculation results show that the proposed algorithm, tested using the Dirlik, Benasciutti–Tovo, Lalanne, and Zhao–Baker models, does not overestimate fatigue life, which means that the calculations are on the safe side. The obtained results prove that the elastoplastic deformations can be applied within the frequency domain for fatigue life calculations. View Full-Text
Keywords: spectral method; fatigue of materials; steel 0H18N9; frequency domain spectral method; fatigue of materials; steel 0H18N9; frequency domain
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Böhm, M.; Kowalski, M.; Niesłony, A. Influence of the Elastoplastic Strain on Fatigue Durability Determined with the Use of the Spectral Method. Materials 2020, 13, 423.

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