Fatigue Life Assessment under Random Loadings

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Metal Failure Analysis".

Deadline for manuscript submissions: closed (31 July 2020) | Viewed by 3186

Special Issue Editor

Department of Engineering for Innovation, Università del Salento, 73100 Lecce, Italy
Interests: fatigue; welded joints; experimental mechanics; FEM; damage models; low-cycle fatigue; aluminum foam; residual stress
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Special Issue Information

Dear Colleagues,

Fatigue knowledge is currently not far from a phenomenological stage despite the relevant effort of researchers over the last two centuries to individuate a theoretical framework. In principle, each load cycle applied to a structural component could potentially lead to an increase of its damage level. This idea is at the same time fascinating and complicated to be translated into practical predictive models and experimental verifications, since the low level of the damage amount introduced by a single load cycle is not measurable at a metallurgical and macroscopic level. The application of variable amplitude loads or random loading sequences further complicates the problem, since the fatigue damage introduced by each cycle depends not only by the applied load, but also on the pre-existing damage level in the component. However, understanding the physical process that determines damage introduced by each load cycle and its interaction with the pre-existing damage is key to achieving a clear interpretation of the fatigue damage phenomenon in all its aspects. For this reason, each progress attained in the fatigue assessment under random loads is important also for the comprehension of the constant amplitude fatigue phenomenon. The hope is that the continuous improvement of experimental techniques and the advances of numerical techniques could move our fatigue knowledge forward towards understanding the vanishing phenomena from which the material damage originated.

The aim of this Special Issue is to collect several articles about all the aspects that contribute to determining the fatigue behavior of structural components subjected to random loads. Contributions are welcome in the field of the presentation of new damage models, experimental verification of classical and innovative rules for damage accumulation evaluation, the presentation of industrial applications in the automotive, aeronautical and mechanical sector, the improvements of numerical techniques for cycle counting, and the statistical and probabilistic analysis of load history.

Prof. Dr. Riccardo Nobile
Guest Editor

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Keywords

  • Fatigue damage
  • Random loads
  • Load history
  • Variable amplitude loads
  • High-cycle fatigue
  • Damage models
  • Fatigue life prediction
  • Linear damage rule
  • Spectrum fatigue

Published Papers (1 paper)

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Research

14 pages, 6062 KiB  
Article
Fatigue Life Assessment of Revised Cope-Hole Details in Steel Truss Bridges
by Ping Liao, Bing Qu, Yaolong Huang, Yi Jia, Yongbao Wang and Haifeng Zhu
Metals 2020, 10(8), 1092; https://doi.org/10.3390/met10081092 - 12 Aug 2020
Cited by 3 | Viewed by 2874
Abstract
In recent years, various welded details with complex local structure, ambiguous fatigue performance have appeared in fully welded steel truss bridges, however, they are not covered in the current design specifications. In order to study the fatigue performance of revised cope-hole details, fatigue [...] Read more.
In recent years, various welded details with complex local structure, ambiguous fatigue performance have appeared in fully welded steel truss bridges, however, they are not covered in the current design specifications. In order to study the fatigue performance of revised cope-hole details, fatigue performance experiments were designed and carried out on three specimens of revised detail with the same dimensions but subjected to different stress amplitude. Local finite element model of the revised cope-hole detail was established for further stress analysis. The results of finite element analysis were basically consistent with the static test results at majority of measurement points. Based on the existing fatigue test data and fatigue strength of cope-hole details defined in Eurocode and JSSC design code, the fatigue performance of revised cope-hole details was evaluated. The S-N fitting curve with the failure probability of 2.3% was obtained from the fatigue experiment results. The fatigue stress amplitude was 59.5 MPa when fatigue loading cycle was 2 × 106. It can be concluded that the fatigue performance of revised cope-hole detail was better than that of previous welded detail, which indicated that the revised detail had a significant improvement. Full article
(This article belongs to the Special Issue Fatigue Life Assessment under Random Loadings)
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