Evaluation of notch size effect on LCF life of TA19 specimens based on the stress gradient modified critical distance method

Wang, R.; Liu, Hui; Hu, Dianyin; Li, D.; Mao, Jianqin

doi:10.1111/ffe.12821

Cited by 45 publications

(12 citation statements)

References 73 publications

(104 reference statements)

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“…From the view of fatigue damage parameters, these approaches can be divided into stress-based approaches, strain-based approaches and energy density-based approaches. Typical stress-based approaches include the stress field intensity (SFI) method [3][4][5], advanced volume method (AVM) [6][7][8][9] and theory of critical distance (TCD) [10][11][12][13]. In the SFI method, the determination of the fatigue damage region needs abundant experiments on smooth specimens and notched ones with different stress concentration factors, which is both time-consuming and cost-consuming.…”

Section: Introductionmentioning

confidence: 99%

Fatigue tests on notched specimens of G20Mn5QT cast steel and life prediction by a new strain-based method

Han

Wang

Yin

et al. 2020

Archiv.Civ.Mech.Eng

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Fatigue performance of notched specimens of G20Mn5QT cast steel was investigated experimentally and analytically. Fatigue tests on a total number of 22 semi-circular notched specimens were conducted with the load ratios of − 1 and 0.1. Nominal stress-fatigue life relationship was obtained, and mean stress correction rules were verified for the notched specimens based on the test results. A new strain-based approach, strain field intensity (SNFI) method, was proposed, in which fatigue life of materials is predicted based on the weighted average strain in the fatigue damage region. The fatigue lives of the test specimens were predicted using three strain-based approaches, modified Neuber's rule, equivalent strain energy density (ESED) method and the proposed SNFI method. The fatigue life prediction by the SNFI method was in very good agreement with the test results, which verified the rationality and applicability of the proposed SNFI method and also the adopted fatigue properties of G20Mn5QT cast steel. Both the modified Neuber's rule and the ESED method gave conservative prediction of the fatigue life of the notched specimens. The necessity of the 3-dimensional fatigue damage region was also discussed for the proposed SNFI method. Keywords Fatigue life prediction • Strain field intensity method • G20Mn5QT cast steel • Fatigue tests • Notched specimens List of symbols b Fatigue strength exponent c Fatigue plastic exponent E Elastic modulus K ′ Cyclic hardening coefficient K f Fatigue notch factor K t Theoretical stress concentration coefficient n ′ Cyclic hardening exponent N in f

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Section: Introductionmentioning

confidence: 99%

Fatigue tests on notched specimens of G20Mn5QT cast steel and life prediction by a new strain-based method

Han

Wang

Yin

et al. 2020

Archiv.Civ.Mech.Eng

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“…In the present study, the accuracy in performing fatigue assessment of the TCD [5][6][7][8][9][10] and the SED approach [11][12][13][14][15][16][17][18] has been checked systematically against a large number of experimental results taken from the literature.…”

Section: Introductionmentioning

confidence: 99%

“…In order to better clarify the recursive procedure which can be used to assess the number of cycles to failure σf ,e by using the TCD, consider a notched specimen subjected to a given value of the nominal stress g,a. The distribution of the linear elastic stress field can be determined by using a (10) The relationship between LM and σf can be obtained by testing plain and V-notched specimens.…”

Section: Introductionmentioning

confidence: 99%

Comparison of TCD and SED methods in fatigue lifetime assessment

Berto

Hong

et al. 2019

International Journal of Fatigue

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This paper assesses the accuracy and reliability of the Theory of Critical Distances (TCD) and the Strain Energy Density (SED) approach in estimating the lifetime of plain and notched specimens subjected to cyclic loading. To validate the two approaches for plain and notched components under uniaxial and multiaxial fatigue loading, a large bulk of experimental data taken from the literature were re-analyzed, with the state variables, i.e. the stress distributions and the strain energy density, being calculated via Finite Element (FE) approach. The results obtained demonstrate that both the TCD and the SED approach can provide highly accurate fatigue life estimation. In addition, the two adopted approaches require few computational efforts and experimental data to be implemented and used for fatigue design in situations of practical interest.

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“…The turbine blades are usually fabricated with cooling holes which support the resistance against elevated temperature. However, Wang et al 2,3 investigated the effect of circular hole size on the low-cycle fatigue (LCF) life of TA19 specimens and found the effect of stress gradient on the fatigue crack growth. The higher stress concentration around cooling holes or accidental scratches and notches results in premature slip and plastic deformation around these regions.…”

Section: Introductionmentioning

confidence: 99%

Effect of secondary crystal orientations on the deformation anisotropy for nickel-based single-crystal plate with notch feature

Zhai

Khan

Correia

et al. 2019

The Journal of Strain Analysis for Engineering Design

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The effects of the secondary crystal orientations on the nickel-based single-crystal superalloy turbine blades were investigated. The stress concentration features were used for investigation of the optimal secondary crystal orientation leading to the higher strength of the single-crystal turbine blades. The crystal plastic finite element method coupled with micromechanics constitutive model is applied to study the effect of secondary crystal orientation on plastic deformation and mechanical behavior around the cooling holes and notches with the primary (load) orientation fixed at [001] direction. For nickel-based superalloy plates with holes or notches, the secondary crystal orientation effect on the strength needs to be clarified at various load levels. The maximum von Mises stress in the single-crystal alloy varies significantly with variation in the secondary crystal orientations. It was found that only two slip systems dominate the deformation process of the material owing to their favorable orientation with loading. The secondary orientation of 45°was identified with lowest resolved shear stress in the dominating slip systems and potential of producing higher strength for single-crystal turbine blades.

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Evaluation of notch size effect on LCF life of TA19 specimens based on the stress gradient modified critical distance method

Cited by 45 publications

References 73 publications

Fatigue tests on notched specimens of G20Mn5QT cast steel and life prediction by a new strain-based method

Fatigue tests on notched specimens of G20Mn5QT cast steel and life prediction by a new strain-based method

Comparison of TCD and SED methods in fatigue lifetime assessment

Effect of secondary crystal orientations on the deformation anisotropy for nickel-based single-crystal plate with notch feature

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