Investigation of Fatigue Crack Growth in Full-Scale Railway Axles Subjected to Service Load Spectra: Experiments and Predictive Models
| Autor: | D. Regazzi, Stefano Beretta, Amir Pourheidar, Luca Patriarca |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Mining engineering. Metallurgy
Series (mathematics) business.industry EA4T steel TN1-997 Metals and Alloys Full scale Service load Structural engineering Paris' law Residual Spectral line variable amplitude loading Axle fatigue crack growth residual lifetime prediction Load spectrum General Materials Science railway axle business Mathematics |
| Zdroj: | Metals Volume 11 Issue 9 Metals, Vol 11, Iss 1427, p 1427 (2021) |
| ISSN: | 2075-4701 |
| DOI: | 10.3390/met11091427 |
| Popis: | In this paper, a series of experimental investigations was performed on full-scale railway axles to analyze the fatigue crack growth behavior of EA4T steel under load spectrum derived from real operating conditions. The experimental results were compared to life predictions carried out adopting two models: (i) the conventional Nasgro equation and (ii) the cyclic R-curve concept implemented in the Modified Nasgro equation for describing the crack growth behavior of an arbitrary crack length. The results show that the life predictions performed by means of the Modified Nasgro equation coincide well with the experimental results with an underestimation of the residual lifetime less than 32%, while the traditional Nasgro equation leads to significant overestimation (≈120%) of the residual lifetime for load spectra close to the in service scenario. |
| Databáze: | OpenAIRE |
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