A unified multiscale ductility exhaustion based approach to predict uniaxial, multiaxial creep rupture and crack growth

Nikbin, Kamran

doi:10.1016/j.engfracmech.2017.04.046

Cited by 23 publications

(3 citation statements)

References 42 publications

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“…Consequently, brittle fractures are commonly observed. The occurrence is consistent with what has been observed in the literature [18]. For the blunt sample, the location of highest triaxiality value is found between the notch center and the root, but for the sharp sample, the maximum triaxiality is found adjacent to the notch tip.…”

Section: Stress Distribution and Creep Damagesupporting

confidence: 92%

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Finite Element Modelling of Creep Rupture on Grade 91 Steel using Monkman-Grant Ductility based Damage Model

Alang,

Alias,

Nur Atiqah

et al. 2021

IJIE

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Failure strain is a main parameter used in the ductility exhaustion based damage model in which the accuracy of the prediction is dependent on its input value. The experimental measured has indicated that the value of strain at fracture is extensively scattered, therefore may affect the prediction. This paper presents the result of creep rupture time using a modified creep damage model incorporating Monkman-Grant (MG) failure strain as an alternative to strain at fracture. Both strains at fracture and MG failure strain are separately employed in the damage model to predict the failure time of uniaxial smooth specimen and notched bar with different acuity ratios of 3.0 and 20. The FE model of the specimen is loaded under different stress values and the multiaxial failure strain at each stress level is estimated using Cock and Ashby void growth model. The predicted creep rupture time that is compared to the experimental data (in a range of 40-1000 hours) showing a good agreement within the scatter band of +/-factor of 2. Both approaches using strain at fracture and MG failure strain can be used in predicting the creep failure under uniaxial and multiaxial features. The advantage of using MG strain is that the laboratory creep testing can be interrupted prior to specimen fractured or once the secondary creep deformation occurs. Meanwhile, the determination of strain at fracture needs longer test duration where the test can bestopped only when the specimen broken.

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Section: Stress Distribution and Creep Damagesupporting

confidence: 92%

“…Dislocation can move by gliding in a slip plane or climbing with the aid of diffusion. Meanwhile, at low stress, the diffusional process dominates [18]. The different of creep process dominant caused the two slopes of the data.…”

Section: Materials and Damage Models 21 Constitutive Materials Modelmentioning

confidence: 94%

Finite Element Modelling of Creep Rupture on Grade 91 Steel using Monkman-Grant Ductility based Damage Model

Alang,

Alias,

Nur Atiqah

et al. 2021

IJIE

View full text Add to dashboard Cite

show abstract

“…The other points whose experimental data mainly come from reference fall out the 1.3 band. The higher scatter of those points may thus be ascribed to the different batches of materials [53]. Although the proposed model has been proved to predict the experimental results reasonably, it still needs further validation in the future by using a wide range of the experimental database, which could give more support to its industrial applicability.…”

Section: Predictive Capability Of the Proposed Modelmentioning

confidence: 99%

Microstructural damage mechanics-based model for creep fracture of 9%Cr steel under prior fatigue loading

Zhang

Wang

Chen

et al. 2019

Theoretical and Applied Fracture Mechanics

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Predicting the remnant creep fracture life precisely is crucial for ensuring safety of high temperature components. This study presents a microstructural damage mechanics-based model for creep fracture of 9%Cr steel under prior fatigue loading. Microstructure observation reveals that the decrease of dislocation density and the growth of martensite lath width occurred during prior fatigue process contribute to the degradation of creep strength. Particularly, coarsening of martensite lath width plays the dominated role. To take into account the effect of the prior fatigue loading, kinematic damage equations that represent the evolution of dislocation density and martensite lath are proposed in the developed model. With the proposed model, creep fracture life and creep failure strain at various lifetime factions, strain amplitudes and hold times of prior fatigue loading can be satisfactorily predicted, which manifests that the proposed model is robust in capturing the effects of various prior fatigue loadings. The proposed model is also shown to be able to accurately predict prolonged creep deformation of other similar steel after different prior fatigue loadings.

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A Unified Multiscale/Multiaxial Constraint-Based Model for Creep Damage and Crack Growth in Engineering Alloys

Nikbin

2023

Comprehensive Structural Integrity

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A unified multiscale ductility exhaustion based approach to predict uniaxial, multiaxial creep rupture and crack growth

Cited by 23 publications

References 42 publications

Finite Element Modelling of Creep Rupture on Grade 91 Steel using Monkman-Grant Ductility based Damage Model

Finite Element Modelling of Creep Rupture on Grade 91 Steel using Monkman-Grant Ductility based Damage Model

Microstructural damage mechanics-based model for creep fracture of 9%Cr steel under prior fatigue loading

A Unified Multiscale/Multiaxial Constraint-Based Model for Creep Damage and Crack Growth in Engineering Alloys

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