Stress-strain calculation and fatigue life assessment of V-shaped notches of turbine disk alloys

Zhu, Shun‐Peng; Xu, Shen; Hao, Meng-Fei; Liao, Ding; Wang, Hongtao

doi:10.1016/j.engfailanal.2019.104187

Cited by 33 publications

(12 citation statements)

References 41 publications

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“…However, experiments show that the Neuber rule generally overestimates the values of local stress and strain . To improve precision in notch fatigue analysis, Topper et al and Yao modified the Neuber rule by substituting K t with K f , which closely relates to stress gradients and applied stress levels:

σ^{a} \cdot ε^{a} = \frac{K_{f}^{2} S^{2}}{E} = C .

…”

Section: Local Stress‐strain Approachesmentioning

confidence: 99%

“…In order to meet the above‐mentioned design requirements, it is critical to achieve the accurate calculation of fatigue strength or lifetime, rather than using empirical methods or life divergence coefficients, which might greatly reduce the optional design space for engineering components . This is particularly important when considering the notch effect on the fatigue resistance of components, which varies considerably with notch geometric features . Under external loads, geometric discontinuities unavoidably raise stress concentrations as well as complex stress‐strain responses within the structure, in which the structural geometry suddenly changes (see Figure ) and thus result in complex fatigue problems and induce surface fatigue cracks, even under conditions of inconspicuous plastic deformation .…”

Section: Introductionmentioning

confidence: 99%

“…[6][7][8][9] This is particularly important when considering the notch effect on the fatigue resistance of components, which varies considerably with notch geometric features. [10][11][12][13] Under external loads, geometric discontinuities unavoidably raise stress concentrations as well as complex stress-strain responses within the structure, in which the structural geometry suddenly changes (see Figure 1) and thus result in complex fatigue problems and induce surface fatigue cracks, even under conditions of inconspicuous plastic deformation. [14][15][16] According to this, the complete understanding of notch effect is pivotal to ensure safety and durability of engineering components.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Recent advances on notch effects in metal fatigue: A review

Liao

Zhu

Correia

et al. 2020

Fatigue Fract Eng Mat Struct

Self Cite

173

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Notch features including holes, fillets, shoulders, and grooves commonly exist in engineering components. When subjected to external loads, these geometrical discontinuities generally act as stress raisers and thus present significant influences on the component strength and life, which are more remarkable under complex loading paths. Accordingly, numerous theories and approaches have been developed to address notch effects in metal fatigue as well as damage modelling and life predictions, which aim to provide theoretical support for structural optimal design and integrity evaluation. However, most of them are self‐styled or focus on specific objects, which limits their engineering applicability. This review recalls recent developments and achievements in notch fatigue modelling and analysis of metals. In particular, four commonly used methods for fatigue evaluation of metallic notched components/structures are summarized and elaborated, namely, nominal stress approaches, local stress‐strain approaches, and critical distance theories and weighting control parameters‐based approaches, which intend to provide a reference for further research on notch fatigue analysis and promote the integration and/or development among different approaches for practice.

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σ^{a} \cdot ε^{a} = \frac{K_{f}^{2} S^{2}}{E} = C .

…”

Section: Local Stress‐strain Approachesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Recent advances on notch effects in metal fatigue: A review

Liao

Zhu

Correia

et al. 2020

Fatigue Fract Eng Mat Struct

Self Cite

173

View full text Add to dashboard Cite

show abstract

“…In this case, the turbine rotor is prone to generate complex plastic deformation, which inevitably leads to low-cycle fatigue failure. As a result, low-cycle fatigue failure becomes the main failure mode of turbine rotor and seriously affects the reliability and security of aeroengine [1][2][3]. To meet the reliability and high-performance requirements, the fatigue life evaluation of turbine rotor is increasingly important in aeroengine design.…”

Section: Introductionmentioning

confidence: 99%

Decomposed Collaborative Modeling Approach for Probabilistic Fatigue Life Evaluation of Turbine Rotor

et al. 2020

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To improve simulation accuracy and efficiency of probabilistic fatigue life evaluation for turbine rotor, a decomposed collaborative modeling approach is presented. In this approach, the intelligent Kriging modeling (IKM) is firstly proposed by combining the Kriging model (KM) and an intelligent algorithm (named as dynamic multi-island genetic algorithm), to tackle the multi-modality issues for obtaining optimal Kriging parameters. Then, the decomposed collaborative IKM (DCIKM) comes up by fusing the IKM into decomposed collaborative (DC) strategy, to address the high-nonlinearity problems for accelerating simulation efficiency. Moreover, the DCIKM-based probabilistic fatigue life evaluation theory is introduced. The probabilistic fatigue life evaluation of turbine rotor is regarded as case study to verify the presented approach; the evaluation results reveal that the probabilistic fatigue life of turbine rotor is 3296 cycles. The plastic strain range ∆εp and fatigue strength coefficient σf′ are the main affecting factors to fatigue life, whose effect probability are 28% and 22%, respectively. By comparing with direct Monte Carlo method, KM method, IKM method and DC response surface method, the presented DCIKM is validated to hold high efficiency and accuracy in probabilistic fatigue life evaluation.

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“…This mainly because, while the failure theory does not consider the time in the analysis, as it is the case of the Goodman, Elliptical and Soderberg failure theories given by Budynas and Nisbett [8], in the fatigue strength analysis, the S-N curve only represents the strength average [9,10]. Therefore, neither the failure theory nor the fatigue analysis is efficient to perform a probabilistic analysis [2,11,12]. Thus, in this paper based on the A572 Gr.…”

Section: Introductionmentioning

confidence: 99%

Weibull S-N Fatigue Strength Curve Analysis for A572 Gr. 50 Steel, Based on the True Stress—True Strain Approach

Molina¹,

Piña‐Monarrez²,

Barraza-Contreras³

2020

Applied Sciences

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In this paper a Weibull methodology to determine the probabilistic percentiles for the S-N curve of the A572 Gr. 50 steel is formulated. The given Weibull/S-N formulation is based on the true stress and true strain values, which are both determined from the stress-strain analysis. For the analysis, the Weibull β and η parameters are both determined directly from the maximum and minimum addressed stresses values. The S-N curve parameters are determined for 103 and 106 cycles. In the application, published experimental data for the CSA G40.21 Gr. 350W steel is used to derive the true stress and true strain parameters of the A572 Gr. 50 steel. Additionally, the application of the S-N curve, its probabilistic percentiles and the Weibull parameters that represent these percentiles are all determined step by step. Since the proposed method is flexible, then it can be applied to determine the probabilistic percentiles of any other material.

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Stress-strain calculation and fatigue life assessment of V-shaped notches of turbine disk alloys

Cited by 33 publications

References 41 publications

Recent advances on notch effects in metal fatigue: A review

Recent advances on notch effects in metal fatigue: A review

Decomposed Collaborative Modeling Approach for Probabilistic Fatigue Life Evaluation of Turbine Rotor

Weibull S-N Fatigue Strength Curve Analysis for A572 Gr. 50 Steel, Based on the True Stress—True Strain Approach

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