Modeling the microstructure influence on fatigue life variability in structural steels

Sharaf, Mohamed; Kucharczyk, Pawel; Vajragupta, Napat; Münstermann, Sebastian; Hartmaier, Alexander; Bleck, Wolfgang

doi:10.1016/j.commatsci.2014.05.059

Cited by 27 publications

(22 citation statements)

References 51 publications

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“…41 Sharaf found that the saturation regime appears after 2-3 loading cycles. 22 In this work, we used 2 cycles and assume that the saturation regime is reached. It is pointed out here, that a saturation in the plastic slip per cycle will only be reached if a material model with a monotonous hardening behavior is applied, whereas in the case of cyclic softening such a saturation cannot be expected.…”

Section: B Fatigue Crack Initiationmentioning

confidence: 99%

“…In this work, the parameters A 1 and A 2 are loosely approximated inspired by work of Sharaf. 22 The chosen material parameters are summarized in Table I and clustered into five sub-blocks according to their physical meaning. The elastic material behavior is orthotropic and thus can be described by elastic constants C 11 , C 12 , C 44 .…”

Section: A Localization Of Strainmentioning

confidence: 99%

“…The approach to determine fatigue crack initiation is applied to the group of RVEs to obtain statistically reliable results. Similar to 21,22,40 a small number of loading cycles per load amplitude is applied.…”

Section: B Crack Initiation Timementioning

confidence: 99%

“…19 Cyclic strain localization in persistent slip bands (PSBs) is generally found and accepted as the critical onset of fatigue damage in the HCF regime in ductile single-phase and also in many precipitation-hardened alloys. 20 Castelluccio 21 and Sharaf 22 have implemented methods to study the influence of microstructure on fatigue properties. While Castelluccio focused on the modeling of crack propagation, Sharaf put the focus on the design of representative volume elements (RVE) and the determination of failure probabilities due to the influence of inclusions.…”

Section: Introductionmentioning

confidence: 99%

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Micromechanical modeling of fatigue crack initiation in polycrystals

2017

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Fatigue is an important mechanism for the failure of components in many engineering applications and a significant proportion of the fatigue life is spent in the crack initiation phase. Although a large number of research work addresses fatigue life and fatigue crack growth, the problem of modeling crack initiation remains a major challenge in the scientific and engineering community. In the present work, a micromechanical model is developed and applied to study fatigue crack initiation. In particular, the effect of different hardening mechanisms on fatigue crack initiation is investigated. To accomplish this, a model describing the evolution of the particular dislocation structures observed under cyclic plastic deformation is implemented and applied on randomly generated representative microstructures to investigate fatigue crack initiation. Finally, a method is presented to calculate the S-N curve for the polycrystalline materials. With this work, it is demonstrated how the micromechanical modeling can support the understanding of damage and failure mechanisms occurring during fatigue.

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Section: B Fatigue Crack Initiationmentioning

confidence: 99%

Section: A Localization Of Strainmentioning

confidence: 99%

Section: B Crack Initiation Timementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Micromechanical modeling of fatigue crack initiation in polycrystals

2017

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“…The authors characterized this branch of study as the microstructure‐sensitive modeling of fatigue processes. Sharaf et al performed a study on the microstructure‐based prediction of the cyclic short crack growth of a ferritic‐pearlitic steel, and the numerical prediction proved that accumulated dislocation slip is concentrated at the inclusion edges for fatigue crack initiation. Gillner and Münstermann employed a numerical approach to link the microstructure with the SN‐curve.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on the Impact of Deoxidation Methods on the Fatigue Properties of Bearing Steels

Bao

Gan

et al. 2018

steel research int.

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Strong deoxidation and weak deoxidation are two kinds of deoxidation methods frequently applied in steelmaking. In the present study, high‐carbon chromium bearing steels are smelted with a strong deoxidizer and a weak deoxidizer, respectively in industrial trials. The generation mechanism of inclusions is analyzed, and the inclusion stability diagrams of the Fe–Si–Al–Mg–Mn–O system at 1873 and 1843 K are calculated. The very high cycle fatigue life of bearing steels deoxidized with different deoxidizers is also experimentally compared. The results showed that the evolution routes of inclusion in high‐carbon chromium bearing steels deoxidized by Si and Al are CaO–Al2O3–SiO2 → CaO–Al2O3–SiO2–MgO and Al2O3 → CaO–Al2O3–SiO2–MgO, respectively. The Al content in steel is controlled by different methods when different deoxidizers are applied. The effect of the oxide inclusions generated during Si deoxidization on the fatigue life is lower than that during Al deoxidization, even if the total oxygen content is slightly higher. This effect suggests that it is not accurate to evaluate the fatigue life of steels with the total oxygen content, and it is also desirable to produce bearing steels with the Si deoxidation method.

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Fatigue Modeling: From Microstructure to Component Scale

Sharaf

Münstermann

2016

Handbook of Software Solutions for ICME

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Modeling the microstructure influence on fatigue life variability in structural steels

Cited by 27 publications

References 51 publications

Micromechanical modeling of fatigue crack initiation in polycrystals

Micromechanical modeling of fatigue crack initiation in polycrystals

An Experimental Study on the Impact of Deoxidation Methods on the Fatigue Properties of Bearing Steels

Fatigue Modeling: From Microstructure to Component Scale

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