Safe life approach considering creep-fatigue interaction and Weibull statistics for crack growth evaluation based on field feedback applied to a GT first stage blade

Vacchieri, E.; Gallo, B.G.; Guarnone, P.; Poggio, E.; Villari, Paolo; Holdsworth, S.R.

doi:10.1016/j.prostr.2017.11.076

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2023

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“…[8][9][10][11][12][13][14][15] Ravi Chandran 16,17 presented an S-N curve model employing the Gumbel distribution. Vacchieri et al 18 used the safe life approach to estimate the fatigue life of a gas turbine first-stage blade. The theory of critical distances was used to predict the fatigue life in notched single-crystal superalloy components.…”

Section: Introductionmentioning

confidence: 99%

The porosity distribution of nickel‐base single‐crystal superalloy DD5 and its fatigue life property

Susmel

Jiang³

et al. 2023

Fatigue Fract Eng Mat Struct

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The porosity of nickel-base single crystals (NBSXs) is still an unavoidable casting problem that has a significant influence on the fatigue life of NBSXs. In order to quantify the porosity effect, a porosity-distribution-related life prediction method is proposed in this paper. The porosity size in a NBSX was measured, and the size distribution was regressed. The results show that the porosity size that is characterized by Feret's diameter follows a modified logarithmic normal distribution. The relation among the applied stress, porosity size, and lifetime is expressed by using the proposed method. The disperse band of S-N curve is investigated based on the probability distribution of the porosity size. The results show that the predicted S-N curve agrees well with the experimental data.

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