Mean Stress Effect on the Fatigue Life of 304L Austenitic Steel in Air and PWR Environments Determined with Strain- and Load-Controlled Experiments

Spätig, P.; Roux, Jean‐Christophe; Bruchhausen, Matthias; Mottershead, Kevin

doi:10.3390/met11020221

Cited by 4 publications

(5 citation statements)

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“…The simulation results are compared with the experimental result for the validation of the numerical model. The numerical model gives the results close to the experimental results similar like in [3,4].…”

Section: Introductionsupporting

confidence: 81%

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Application of Finite Element Method for Low Cycle Fatigue Analysis for Steel

PATE,

DUNDULIS,

GRYBENAS

2023

METAL Conference Proeedings

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The experimental estimation of the fatigue curve is quite expensive and complex. It is very difficult to create an actual reactor's working environment, such as extreme temperatures, etc. Hence, the finite element method can be employed for the investigation, estimation of the fatigue behaviour of the steel, and plotting the fatigue curve, using this curve, the fatigue mechanism can be studied in detail.In this research, we have created a finite element model for investigating the low cycle fatigue behaviour of steel using LS-Dyna and ANSYS. A strain-controlled low-cycle fatigue test experiment at 300 °C on AISI 304L steel for 0.3% strain was carried out and the results of it are used to estimate the material model parameters and validate the simulation results. The simulation model is created to replicate the experiment. The simulation results are compared with the experimental results. It is observed that the simulation results are close to the experimental results. On the bases of the presented results, it can be concluded that the presented methodology can be employed for the low cycle fatigue analysis for the approximate prediction of the fatigue life and the change in the material behaviour with the increase in the number of loading cycles.

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Section: Introductionsupporting

confidence: 81%

“…This steel is widely selected for the structure operating in the high temperature, pressure flatulating loading, etc. and these conditions are responsible for the thermomechanical fatigue [3].…”

Section: Materials and Specimensmentioning

confidence: 99%

Application of Finite Element Method for Low Cycle Fatigue Analysis for Steel

PATE,

DUNDULIS,

GRYBENAS

2023

METAL Conference Proeedings

View full text Add to dashboard Cite

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“…A sub-programme was started to simulate the constant load via tests with mean stress under strain control. The results of this sub-programme were published separately [20].…”

Section: Test Programmementioning

confidence: 99%

Characterization of Austenitic Stainless Steels with Regard to Environmentally Assisted Fatigue in Simulated Light Water Reactor Conditions

Bruchhausen

Dundulis

McLennan

et al. 2021

Metals

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A substantial amount of research effort has been applied to the field of environmentally assisted fatigue (EAF) due to the requirement to account for the EAF behaviour of metals for existing and new build nuclear power plants. We present the results of the European project INcreasing Safety in NPPs by Covering Gaps in Environmental Fatigue Assessment (INCEFA-PLUS), during which the sensitivities of strain range, environment, surface roughness, mean strain and hold times, as well as their interactions on the fatigue life of austenitic steels has been characterized. The project included a test campaign, during which more than 250 fatigue tests were performed. The tests did not reveal a significant effect of mean strain or hold time on fatigue life. An empirical model describing the fatigue life as a function of strain rate, environment and surface roughness is developed. There is evidence for statistically significant interaction effects between surface roughness and the environment, as well as between surface roughness and strain range. However, their impact on fatigue life is so small that they are not practically relevant and can in most cases be neglected. Reducing the environmental impact on fatigue life by modifying the temperature or strain rate leads to an increase of the fatigue life in agreement with predictions based on NUREG/CR-6909. A limited sub-programme on the sensitivity of hold times at elevated temperature at zero force conditions and at elevated temperature did not show the beneficial effect on fatigue life found in another study.

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“…Eight research contributions have been published in this Special Issue. Six contributions [1][2][3][4][5][6] are directly derived from the INCEFA-PLUS project, whereas two [7,8] are external contributions.…”

Section: Contributionsmentioning

confidence: 99%

“…Cicero et al [1] present the F en factor and other approaches for assessing environmental fatigue and demonstrate the use of the F en in a case study on a charging nozzle of a nuclear power plant. Three contributions in this special issue analyze the influence of different factors on the F en : While Vankeerberghen et al [2] address surface finish and hold-times, Spätig et al [3] focus on the effect of mean stress under load and strain controlled conditions, and Shao et al [7] present an extensive comparison of approaches to take different strain rates into account when calculating the F en .…”

Section: Contributionsmentioning

confidence: 99%