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弹塑性应变对采用谱方法确定的疲劳耐久性的影响。

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

作者信息

Böhm Michał, Kowalski Mateusz, Niesłony Adam

机构信息

Department of Mechanics and Machine Design, Faculty of Mechanical Engineering, Opole University of Technology, Ulica Prószkowska 76, 45-758 Opole, Poland.

出版信息

Materials (Basel). 2020 Jan 16;13(2):423. doi: 10.3390/ma13020423.

DOI:10.3390/ma13020423
PMID:31963261
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7013877/
Abstract

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.

摘要

本文介绍了0H18N9钢在随机载荷条件下弯曲的静态和疲劳试验结果。根据疲劳寿命评估谱方法的理论假设，包括弹塑性变形，将试验结果用于进行计算。所提出的解决方案在载荷条件方面，扩展了谱方法在胡克定律定理之上用于材料疲劳寿命评估的应用。这项工作包括对扩展谱方法在弹塑性变形范围内确定疲劳寿命适用性的提议进行计算验证。所提出修改的目的之一是对用于计算信号功率谱密度概率密度函数的应力幅值进行修正，以考虑塑性变形，并将其用于有缺口的元件。作者使用了商业软件中最常用的四种概率密度函数对该方法进行了测试。实验结果与计算结果的比较结果表明，使用迪利克、贝纳西乌蒂 - 托沃、拉兰内和赵 - 贝克模型测试的所提出算法不会高估疲劳寿命，这意味着计算是安全的。所得结果证明弹塑性变形可应用于频域进行疲劳寿命计算。

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