Numerical analysis of fatigue crack growth under SuperBlock2020 load sequence

Neto, Diogo M.; Borges, M.F.; Antunes, Filipe E.; Sunder, R.

doi:10.1016/j.engfracmech.2021.108178

Cited by 9 publications

(2 citation statements)

References 21 publications

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“…23,24 In recent studies, the authors studied FCG with the cumulative plastic strain at the crack tip as the driving force in constant amplitude, 25 as well as in VAL with overloads 26 and a more complex load pattern. 27 Good fittings were obtained, comparing the numerical FCG predictions with the experimental results, validating the numerical models.…”

Section: Introductionsupporting

confidence: 63%

Effect of L‐T and S‐T orientations on fatigue crack growth in an aluminum 7050‐T7451 plate

Borges

Antunes

Jesús

et al. 2023

Fatigue Fract Eng Mat Struct

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This study is focused on the anisotropic fatigue crack growth (FCG) behavior of an aluminum AA7050‐T7451 plate. L‐T and S‐T orientations were studied in M(T) samples with W = 50 mm, in mode I loading, with R‐ratio of +0.05. A numerical approach was used, assuming that crack tip plastic strain is the crack driving force. A purely kinematic elastic–plastic model was calibrated using experimental data from low cycle fatigue tests of smooth specimens in L and S orientations. The predicted FCG rates agree well with experimental trends in the Paris' regime, suggesting that cyclic plastic deformation is the main damage mechanism. The numerical model was used to estimate the stress ratio effect for both orientations, which was found to be linked with crack closure variations. However, the closure free predicted trends for both microstructural orientations at R = 0.05 are not overlapped, suggesting an effect of microstructure not linked to crack closure.

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Section: Introductionsupporting

confidence: 63%

Effect of L‐T and S‐T orientations on fatigue crack growth in an aluminum 7050‐T7451 plate

Borges

Antunes

Jesús

et al. 2023

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…Besides, the direct comparisons made with experimental results validated the assumption that cyclic plastic deformation is the main crack driving force. Borges et al [ 37 ] successfully predicted the effect of Δ K observed experimentally in 2024-T251 aluminum alloy and 18Ni300 steel, while Neto et al [ 35 ] predicted the effect of stress ratio, and Neto et al [ 38 ] predicted the effect of Superblock2020 load pattern. Therefore, this approach can be applied with confidence to predict FCG rates in new situations.…”

Section: Introductionmentioning

confidence: 99%

Effect of Residual Stresses on Fatigue Crack Growth: A Numerical Study Based on Cumulative Plastic Strain at the Crack Tip

et al. 2022

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Residual stresses affect the fatigue behavior, given that compressive stresses delay the phenomenon, while tensile stresses accelerate it. However, the mechanisms behind the effect of residual stresses are not totally understood. A numerical study is developed here to understand the effect of thermal residual stresses (TRSs) on fatigue crack growth (FCG). The crack driving force was assumed to be the cumulative plastic strain at the crack tip. The heating of a region ahead of the crack tip produced elastic compressive TRS, which were 69% of material’s yield stress. Alternatively, plastic deformation was produced by severe cooling followed by heating to generate compressive residual stresses. The crack propagation in the compressive residual stress field produced a decrease in the FCG rate. On the other hand, without the contact of crack flanks, the TRS showed no effect on FCG. Therefore, the TRSs only affect FCG by changing the crack closure level.

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Numerical prediction of fatigue crack growth based on cumulative plastic strain versus experimental results for AA6082-T6

et al. 2022

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Numerical analysis of fatigue crack growth under SuperBlock2020 load sequence

Cited by 9 publications

References 21 publications

Effect of L‐T and S‐T orientations on fatigue crack growth in an aluminum 7050‐T7451 plate

Effect of L‐T and S‐T orientations on fatigue crack growth in an aluminum 7050‐T7451 plate

Effect of Residual Stresses on Fatigue Crack Growth: A Numerical Study Based on Cumulative Plastic Strain at the Crack Tip

Numerical prediction of fatigue crack growth based on cumulative plastic strain versus experimental results for AA6082-T6

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