Fatigue crack growth model including load sequence effects – Model development and calibration for railway axle steels

Maierhofer, Jürgen; Gänser, Hans-Peter; Šimůnek, David; Leitner, Martin; Pippan, Reinhard; Luke, Michael

doi:10.1016/j.ijfatigue.2019.105377

Cited by 24 publications

(26 citation statements)

References 28 publications

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“…The fitting of the cyclic R-curve will be presented in Section 4.2. [42]) and comparison with the available data in literature [40] and (b) crack growth curves and interpolation with the Nasgro equation.…”

Section: Fatigue Crack Propagation Tests Resultsmentioning

confidence: 99%

“…The results indicated that the roughness-induced and oxide-induced crack closure mechanisms play an important role in the threshold area of the EA4T steel and that R-curve concept leads to an adequate description of the phenomena [39]. In terms of application to railway axles, the differences between the adoption of Nasgro equation and R-curve concept for describing crack growth curves have been recently discussed [40], but an experimental full-scale validation adopting real load spectrum, and a comparison with the widely used Nasgro equation, is still missing.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Fatigue Crack Growth in Full-Scale Railway Axles Subjected to Service Load Spectra: Experiments and Predictive Models

Pourheidar

Patriarca

Beretta

et al. 2021

Metals

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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.

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Section: Fatigue Crack Propagation Tests Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of Fatigue Crack Growth in Full-Scale Railway Axles Subjected to Service Load Spectra: Experiments and Predictive Models

Pourheidar

Patriarca

Beretta

et al. 2021

Metals

View full text Add to dashboard Cite

show abstract

“…The number of studies on the retardation effect due to OICC is very limited. Only very few publications can be found in the literature on the topic of the effects of underload cycles [ 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Underload Cycles on Oxide-Induced Crack Closure Development in Cr-Mo Low-Alloy Steel

et al. 2021

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Underload cycles with small load amplitudes below the fatigue crack growth threshold are dominantly considered as insignificant cycles without any influence on fatigue lifespan of engineering structural components. However, this paper shows that in some cases these underload cycles can retard the consequent crack propagation quite significantly. This phenomenon is a consequence of oxide-induced crack closure development during cyclic loading below the threshold. The experimentally described effect of fatigue crack growth retardation was supported by measurement of the width and the thickness of the oxide debris layer using the EDS technique and localized FIB cuts, respectively. Both the retardation effect and the amount of oxide debris were larger for higher number and larger amplitudes of the applied underload cycles. Crack closure measurement revealed a gradual increase of the closure level during underload cycling. Specimens tested in low air humidity, as well as specimens left with the crack open for the same time as that needed for application of the underload cycles, revealed no retardation effect. The results can improve our understanding of environmental effects on fatigue crack propagation and understanding the differences between the results of laboratory testing and the fatigue lives of components in service.

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“…This model can better describe the effect of load loading order, but the interaction between loads is not considered, and the accuracy of prediction cannot be guaranteed. Maierhofer et al 24 established an overall fatigue crack propagation model including short crack behavior and load sequence effects. Richter and Sander 25 investigated the influence of underloads on crack arrest.…”

Section: Introductionmentioning

confidence: 99%

Improved numerical model for fatigue cumulative damage of mechanical structure considering load sequence and interaction

Huang

Wang

Geng

et al. 2021

Advances in Mechanical Engineering

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To more accurately predict the fatigue life of components under the action of random loads, it is necessary to explore the influence of the interaction between the load sequence and the load on the life prediction. Based on the Manson-Halford method and Corten-Dolan model, this paper establishes a fatigue cumulative damage model that takes into account both the load order and the interaction between loads, and also takes into account the loads near the fatigue limit. The fatigue life of mechanical parts under random load can be calculated through this model, which provides a theoretical basis for life prediction under random load spectrum. The fatigue life of mechanical parts under random load can be calculated through this model, which provides a theoretical basis for life prediction under random load spectrum. Comparing the calculation results of the proposed model with the results of Palmgren Miner, Manson-Halford method, and Corten-Dolan model, it is found that the fatigue damage model established can reasonably predict the fatigue life of parts. Comparison and verification of examples further prove the accuracy and reliability of the proposed model.

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Fatigue crack growth model including load sequence effects – Model development and calibration for railway axle steels

Cited by 24 publications

References 28 publications

Investigation of Fatigue Crack Growth in Full-Scale Railway Axles Subjected to Service Load Spectra: Experiments and Predictive Models

Investigation of Fatigue Crack Growth in Full-Scale Railway Axles Subjected to Service Load Spectra: Experiments and Predictive Models

Effect of Underload Cycles on Oxide-Induced Crack Closure Development in Cr-Mo Low-Alloy Steel

Improved numerical model for fatigue cumulative damage of mechanical structure considering load sequence and interaction

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