Probabilistic assessment of creep-fatigue crack propagation in austenitic stainless steel cracked plates

Vojdani, A.; Farrahi, G.H.; Mehmanparast, Ali; Wang, B.

doi:10.1016/j.engfracmech.2018.07.022

Cited by 21 publications

(13 citation statements)

References 23 publications

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“…It can be seen from specimens 8 and 13 and specimens 9, 14, and 15 that obvious scatter of creep data exists. The origin of the scatter comes from many sources, such as the fluctuation of test conditions, surface roughness, grain size, and inhomogeneous microstructure 36,37 …”

Section: Resultsmentioning

confidence: 99%

“…The origin of the scatter comes from many sources, such as the fluctuation of test conditions, surface roughness, grain size, and inhomogeneous microstructure. 36,37 The SEM fracture appearances of creep ruptured specimens at 600 C and 650 C under different stress levels are shown in Figures 2 and 3, respectively. Typical intergranular brittle fracture and transgranular ductile fracture are observed from the SEM images.…”

Section: Creep Behavior Analysismentioning

confidence: 99%

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A novel damage constitutive model for creep deformation and damage evolution prediction

Zhao

Niu

Song

et al. 2022

Fatigue Fract Eng Mat Struct

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In order to accurately predict creep deformation and damage evolution of nickel-based superalloy GH4169, a novel damage constitutive model, that is, TTC CDM-based model, was proposed based on TTC relations and continuum damage mechanics (CDM). This model combined the best features of the TTC relations and CDM. The recently developed TTC relations were intrinsic relations between threshold stress, tensile properties, and creep behavior and exhibited better prediction ability than Wilshire equations. It was determined that the model accurately predicted the minimum creep rate, rupture time, creep deformation, and damage evolution process of GH4169. Microstructural study has revealed that the creep fracture mode gradually converts from intergranular brittle fracture to transgranular ductile fracture as the stress decreases. Furthermore, the nonlinear creep damage accumulation effect was also revealed by the novel model.

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Section: Resultsmentioning

confidence: 99%

Section: Creep Behavior Analysismentioning

confidence: 99%

A novel damage constitutive model for creep deformation and damage evolution prediction

Zhao

Niu

Song

et al. 2022

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…Uncertainty emanates from a variety of sources including the uncertainties of test-, service-, and material-condition that can be exacerbated by geometric factors (GD&T), test procedure, and operator error. [1][2][3] These uncertainties aggregate over time to have a life-limiting effect on components. Typical creep-damage models are deterministic and employ safety factors to achieve conservatism.…”

Section: Motivationmentioning

confidence: 99%

Probabilistic creep with the Wilshire–Cano–Stewart model

Hossain

Cano

Stewart

2023

Fatigue Fract Eng Mat Struct

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Creep behavior is susceptible to uncertainty. Replicated creep data for steel can exhibit logarithm decades of uncertainty, which necessitates the development of probabilistic creep models for reliability‐based design. The deterministic Wilshire–Cano–Stewart (WCS) model is transformed into a probabilistic creep deformation, damage, and rupture prediction model via injecting the uncertainty of test conditions, pre‐existing damage, and material constants. The WCS model is calibrated to replicated quintuplicate creep data from a “single heat” of 304 stainless steel. The Markov chain Monte Carlo (MCMC) method with the Metropolis–Hastings (MH) algorithm is employed to introduce the sources of uncertainties into the model via calibrated probability distribution functions (pdfs). The probabilistic predictions encapsulate most of the experimental outliers across isostresses‐isotherms. Interpolative and extrapolative assessments reveal that minimum‐creep‐strain‐rate (MCSR) and stress rupture (SR) predictions are consistent across isotherms. The WCS probabilistic model captures the range of creep behavior of a single heat of material using short‐term data.

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“…It can be seen from specimens 8, 13, and specimens 9, 14, 15 that obvious scatter of creep data exists. The origin of the scatter comes from many sources, such as the fluctuation of test conditions, surface roughness, grain size and inhomogeneous microstructure 41,42 . The SEM fracture appearances of creep ruptured specimens at 600 and 650 under different stress levels are shown in Figure 2 and Figure 3, respectively.…”

Section: Creep Behavior Analysismentioning

confidence: 99%

Modeling the creep deformation and damage evolution of superalloy GH4169: Application of a novel damage constitutive model based on continuum damage mechanics

Zhao

Niu

Song

et al. 2022

Preprint

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In order to accurately predict creep deformation and damage evolution of nickel-based superalloy GH4169, a novel damage constitutive model, which can be called TTC CDM-based model, was proposed based on TTC relations and continuum damage mechanics (CDM). The stress and temperature dependence of constants were all determined in the novel model, which overcame the weakness of the traditional CDM-based model and made the model have the satisfactory abilities of interpolation and extrapolation. Microstructural study has revealed that the creep fracture mode gradually converts from intergranular brittle fracture to transgranular ductile fracture as the stress decreases. And the critical conditions were identified. It was determined that the novel model accurately predicted the minimum creep rate, rupture time, creep deformation and damage evolution process of GH4169. Furthermore, the nonlinear creep damage accumulation effect was also revealed by the novel model, i.e. the total creep life of GH4169 will be reduced if high stress or high temperature condition was applied first, which was consistent with previous experimental results of variable creep load.

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Probabilistic assessment of creep-fatigue crack propagation in austenitic stainless steel cracked plates

Cited by 21 publications

References 23 publications

A novel damage constitutive model for creep deformation and damage evolution prediction

A novel damage constitutive model for creep deformation and damage evolution prediction

Probabilistic creep with the Wilshire–Cano–Stewart model

Modeling the creep deformation and damage evolution of superalloy GH4169: Application of a novel damage constitutive model based on continuum damage mechanics

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