Creep-fatigue behavior of turbine disc of superalloy GH720Li at 650 °C and probabilistic creep-fatigue modeling

Hu, Dianyin; Ma, Qihang; Shang, Liang; Gao, Ye; Wang, Rongqiao

doi:10.1016/j.msea.2016.05.117

Cited by 59 publications

(29 citation statements)

References 31 publications

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“…That is the fatigue contribution of hold-time cycle. Apart from this geometrical mechanism, creep-fatigue interaction may occur [40][41][42]. Indeed, it was evidenced in other Ni based superalloys [40,41] that the fatigue behaviour is strongly influenced by the prior application of a creep loading, revealing a load history effect.…”

Section: Crack Growth Mechanism Under Hold-time Conditions Considerinmentioning

confidence: 99%

“…Apart from this geometrical mechanism, creep-fatigue interaction may occur [40][41][42]. Indeed, it was evidenced in other Ni based superalloys [40,41] that the fatigue behaviour is strongly influenced by the prior application of a creep loading, revealing a load history effect. On the opposite, a prior fatigue loading does not influence the creep behaviour [41], which is supported by the observed steady creep crack growth behaviour (see Fig.…”

Section: Crack Growth Mechanism Under Hold-time Conditions Considerinmentioning

confidence: 99%

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Relation between crack growth behaviour and crack front morphology under hold-time conditions in DA Inconel 718

Fessler

Andrieu

Bonnand

et al. 2017

International Journal of Fatigue

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 18105To link to this article : a b s t r a c tThe crack growth behaviour of Direct Aged Inconel 718 was studied at 550°C. Experiments were carried out under pure fatigue cycles, hold-time cycles of different durations and a mix of both. Hold-time cycles were systematically associated with complex crack front morphologies. A new numerical approach was developed to assess the effect of crack front morphology on the direct current potential drop technique, mechanical fields at the crack tip and ultimately, measured crack growth rates. Using this approach, a clear relation was established between crack front morphology and its evolution, and the crack growth behaviour under hold-time conditions. Complex crack front morphologies are demonstrated to be responsible for increased crack growth rates. From this, a crack growth mechanism under hold-time conditions is proposed. Finally, the numerical framework here presented is to be considered as a new, easily reproducible, way to properly analyse experimental data when dealing with complex loading cycles and complex crack front morphologies.⇑ Corresponding author at: Safran Aircraft Engines, établissement de Villaroche,

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Section: Crack Growth Mechanism Under Hold-time Conditions Considerinmentioning

confidence: 99%

Section: Crack Growth Mechanism Under Hold-time Conditions Considerinmentioning

confidence: 99%

Relation between crack growth behaviour and crack front morphology under hold-time conditions in DA Inconel 718

Fessler

Andrieu

Bonnand

et al. 2017

International Journal of Fatigue

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“…This combined effect often leads to a significant scatter of HPT disc performance . According to this, methods for fatigue reliability analysis have been developed to take into account different sources of uncertainty resulting from material properties, microstructures, and loads . Among them, Zhao et al introduced a strain load‐strength interference model, in which the fatigue strength coefficient

σ_{f}^{'}

and ductility coefficient

ε_{f}^{'}

are quantified by using normal/Weibull distributions.…”

Section: Introductionmentioning

confidence: 99%

Fatigue reliability assessment of turbine discs under multi‐source uncertainties

Zhu

Liu

Zhou

et al. 2018

Fatigue Fract Eng Mat Struct

174

100

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Hot section components of aircraft engines like high pressure turbine (HPT) discs usually operate under complex loadings coupled with multi‐source uncertainties. The effect of these uncertainties on structural response of HPT discs should be accounted for its fatigue life and reliability assessment. In this study, a probabilistic framework for fatigue reliability analysis is established by incorporating FE simulations with Latin hypercube sampling to quantify the influence of material variability and load variations. Particularly, variability in material response is characterized by combining the Chaboche constitutive model with Fatemi‐Socie criterion. Results from fatigue reliability and sensitivity analysis of a HPT disc indicated that dispersions of basic variables {},,ρω1σf′ must be taken into account for its fatigue reliability analysis. Moreover, the proposed framework based on the strength‐damage interference provides more reasonably correlations with its field number of flights rather than the load‐life interference one.

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“…Thus, appropriate treatment of uncertainty in fatigue design has become a significant topic with widespread interest [17]- [24]. Prior work on statistical or probabilistic aspects of fatigue includes modeling of the variability in material properties (e.g., elastic modulus, fracture toughness, yield strength) [6], [17], [25]- [27], equivalent initial flaw size (EIFS) [21], [28]- [30], microstructures as well as defects [31]- [35], stress-life data [36]- [39], and under multiaxial conditions [40]- [45]. Generally, two aspects need to be addressed for probabilistic fatigue design: a valid PoF-based fatigue model and a probabilistic framework for treating both the random material variables and the uncertainty on model parameters in the fatigue model [46], which has been reviewed in detail recently by Pineau et al [47].…”

Section: Introductionmentioning

confidence: 99%

Probabilistic framework for multiaxial LCF assessment under material variability

Zhu

Foletti

Beretta

2017

International Journal of Fatigue

149

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Abstract:The influence of material variability upon the multiaxial LCF assessment of engineering components is missing for a comprehensive description. In this paper, a probabilistic framework is established for multiaxial LCF assessment of notched components by using the Chaboche plasticity model and Fatemi-Socie criterion. Simulations from experimental results of two steels reveal that the scatter in fatigue lives can be well described by quantifying the variability of four material parameters . A procedure for choosing the safety factor for fatigue design has been derived by using first order approximation.

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Creep-fatigue behavior of turbine disc of superalloy GH720Li at 650 °C and probabilistic creep-fatigue modeling

Cited by 59 publications

References 31 publications

Relation between crack growth behaviour and crack front morphology under hold-time conditions in DA Inconel 718

Relation between crack growth behaviour and crack front morphology under hold-time conditions in DA Inconel 718

Fatigue reliability assessment of turbine discs under multi‐source uncertainties

Probabilistic framework for multiaxial LCF assessment under material variability

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