Fatigue Crack Initiation Mechanisms

Tu, S.T.; Zhang, X.-C.

doi:10.1016/b978-0-12-803581-8.02852-6

Cited by 22 publications

(15 citation statements)

References 88 publications

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“…At the tension peak of the stabilised cycle (point 1) obtained in the simulation, the tension strain in the loading direction increased remarkably in comparison to the compression strain. Such a dramatic increase in the tension strain results in higher strain localisation and sharper shear bands, which can promote micro cracks initiation [53,54]. Therefore, tension peak should be more critical for crack initiation.…”

Section: Resultsmentioning

confidence: 99%

Low Cycle Fatigue Behaviour of DP Steels: Micromechanical Modelling vs. Validation

Moeini

Ramazani

Myslicki

et al. 2017

Metals

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Abstract:This study aims to simulate the stabilised stress-strain hysteresis loop of dual phase (DP) steel using micromechanical modelling. For this purpose, the investigation was conducted both experimentally and numerically. In the experimental part, the microstructure characterisation, monotonic tensile tests and low cycle fatigue tests were performed. In the numerical part, the representative volume element (RVE) was employed to study the effect of the DP steel microstructure of the low cycle fatigue behavior of DP steel. A dislocation-density based model was utilised to identify the tensile behavior of ferrite and martensite. Then, by establishing a correlation between the monotonic and cyclic behavior of ferrite and martensite phases, the cyclic deformation properties of single phases were estimated. Accordingly, Chaboche kinematic hardening parameters were identified from the predicted cyclic curve of individual phases in DP steel. Finally, the predicted hysteresis loop from low cycle fatigue modelling was in very good agreement with the experimental one. The stabilised hysteresis loop of DP steel can be successfully predicted using the developed approach.

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Section: Resultsmentioning

confidence: 99%

Low Cycle Fatigue Behaviour of DP Steels: Micromechanical Modelling vs. Validation

Moeini

Ramazani

Myslicki

et al. 2017

Metals

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“…e growth tended to be smooth at midstage and became significant again at later phase. In the fatigue test, a number of tiny cracks emerged during the increase of fatigue cycles, which differentiate its result pattern from the static load tests [19][20][21][22]. During fatigue loading, the initial cracks in pure bending section gradually get widened and extended upward.…”

Section: Cracksmentioning

confidence: 99%

Fatigue Tests of Concrete Slabs Reinforced with Stainless Steel Bars

Zhang

Zhou

2018

Advances in Materials Science and Engineering

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Experimental studies on fatigue behavior of reinforced concrete slab with stainless steel rebar and carbon steel rebar have shown that, at the same reinforcement ratio, the slope of the deflection-cycle number curves of stainless steel-reinforced concrete slab is lower than that of ordinary steel-reinforced concrete slab. e higher the reinforcement ratio is, the smaller the maximum crack width would be. Higher stress level contributes to larger deflection and reinforcement strain in midspan and shorter fatigue life. Compared to the ordinary steel-reinforced concrete slab, the stainless steel-reinforced concrete slab shows narrower maximum crack under the same number of loading cycles. Less significant midspan deflection, reinforcement strain, and longer fatigue life are observed in stainless steel-reinforced concrete slab at the same reinforcement ratio, stress level, and cycling time. With the increase of reinforcement ratio, the deflection and fatigue life extended.

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“…Although the majority of the lifetime is spent on crack propagation, it is still critically important to investigate the crack nucleation or initiation from the point of view of a comprehensive understanding of fatigue failure mechanisms. Moreover, crack nucleation or initiation is more related to the material microstructure itself; thus, investigation on crack initiation can provide guidance to optimize the material design to improve the material fatigue endurance [30]. Compared to fracture mechanics-based models, cumulative damage models can estimate the total fatigue life in a good way [31].…”

Section: Brief Review Of the Life Prediction Modelsmentioning

confidence: 99%

“…Since fatigue failure is the result of micro or macro cyclic plastic strain [30], plastic strain energy plays a crucial role in the fatigue life determination [42]. Theoretically, plastic strain energy density can be physically interpreted as distortion energy of a volume element [43].…”

Section: Energy Based Modelmentioning

confidence: 99%

A New Empirical Life Prediction Model for 9–12%Cr Steels under Low Cycle Fatigue and Creep Fatigue Interaction Loadings

Wang

Zhang

et al. 2019

Metals

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Low cycle fatigue (LCF) and creep fatigue interaction (CFI) loadings are the main factors resulting in the failure of many critical components in the infrastructure of power plants and aeronautics. Accurate prediction of life spans under specified loading conditions is significant for the design and maintenance of components. In the present study, various LCF and CFI tests are conducted to investigate the effects of temperature, strain amplitude, hold time and hold direction on the fatigue life of P92 steel. To predict fatigue life under different experimental conditions, various conventional life prediction models are evaluated and discussed. Moreover, a new empirical life prediction model is proposed based on the conventional Manson-Coffin-Basquin (MCB) model. The newly proposed model is able to simultaneously consider the effects of temperature, strain amplitude, hold time and hold direction on predicted life. The main advantage is that only the known input experimental parameters are required to perform the prediction. In addition to the validation made through the experimental data of P92 steel conducted in the present paper, the model is also verified through numerous experimental data reported in the literature for various 9–12% Cr steels.

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Fatigue Crack Initiation Mechanisms

Cited by 22 publications

References 88 publications

Low Cycle Fatigue Behaviour of DP Steels: Micromechanical Modelling vs. Validation

Low Cycle Fatigue Behaviour of DP Steels: Micromechanical Modelling vs. Validation

Fatigue Tests of Concrete Slabs Reinforced with Stainless Steel Bars

A New Empirical Life Prediction Model for 9–12%Cr Steels under Low Cycle Fatigue and Creep Fatigue Interaction Loadings

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