Modeling of Creep Deformation and Creep Fracture

Xu, Qiang; Lu, Joan

doi:10.5772/intechopen.89009

Cited by 8 publications

(8 citation statements)

References 27 publications

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“…The predicted relationship [9] of the number of cavities and the creep cavity growth are shown in Figure 11 with rupture time 10200 hours, integrated form of cavity nucleation model shown by equation (7.3). [26] Figure 12. The modelled cavity growth with time, P91 crept at 575 0 C with rupture time 10200 hours, integrated form of cavity growth model shown by equation (7.2).…”

Section: Determination Of Cavitation Constantsmentioning

confidence: 99%

“…The modelled cavity growth with time, P91 crept at 575 0 C with rupture time 10200 hours, integrated form of cavity growth model shown by equation (7.2). [26] Figure 13. The modelled cavitated area fraction along grain boundary with time, P91 crept at 575 0 C with rupture time 10200 hours, model is shown by equation (9.2).…”

Section: Determination Of Cavitation Constantsmentioning

confidence: 99%

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Recent progress on the modelling of the minimum creep strain rate and the creep cavitation damage and fracture

2022

Materials at High Temperatures

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Modelling of the long-term creep damage and lifetime is very challenging, because the minimum creep strain rate, the lifetime, and creep strain at failure are strongly stress level dependent.With the aim for developing a set of creep damage constitutive equations for high Cr steel suitable for long-term service, research work was carried out in the modelling of the minimum creep strain rate with a wide stress level, the modelling of creep cavitation damage and rupture, and the coupling between creep cavitation damage and creep deformation.The stress driven cavitation concept was taken in the development of creep cavity nucleation model and cavity growth model. These two models were calibrated together using cavity histogram first, then a simple analytical equation was derived to model creep cavitation damage via the cavitated area fraction along grain boundary. The creep cavitation damage model offered the theoretical background and supports for the stressbased extrapolation method and time-based extrapolation method. Two case study were carried to explore the opportunities.This paper reports a summary of progresses achieved in the modelling of the minimum creep strain rate over a wide stress, the modelling of cavitation damage and fracture, and the lifetime extrapolation methods.This paper contributes to the generic methodology as well as the specific knowledge to the topic area.

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Section: Determination Of Cavitation Constantsmentioning

confidence: 99%

Section: Determination Of Cavitation Constantsmentioning

confidence: 99%

Recent progress on the modelling of the minimum creep strain rate and the creep cavitation damage and fracture

2022

Materials at High Temperatures

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“…in the above step (3). The coefficient designations used with linking to Equation (3.3), and Equation (3.11).…”

Section: The Development and Application Of Creep Fracture Criterion mentioning

confidence: 99%

“…This paper will report the application such methodology to other materials such as P92, E911 and MARBN, where the x-ray synchrotron cavitation data has been available. It is further suggested that real mechanism based on creep cavity damage model should be integrated into the development of the scientifically sound creep damage constitutive equations [2][3][4], and further developed and validated under multi-axial situations [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

The development of creep damage constitutive equations for high Cr steel

Zheng

et al. 2020

Materials at High Temperatures

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This paper reports (1) an application of the modified hyperbolic sine law to P92 for the minimum creep strain rate over a wider range of stress level, and 2) the calibration of the creep cavity fracture model and its applications to such as P92, E911 and MARBN alloys. It was motivated by the original development of creep cavitation based creep rupture model and application to other alloys, and the need of creep strain and stress relation over a wider range of stress. The results include: (1) the calibration of creep cavity fracture model for E911, and the pre-required cavity nucleation and growth models, for E911, (2) the creep lifetime and stress relation coefficient U' for P92, and (3) the relationship of the cavity nucleation rate coefficient A 2 and stress level for MARBN cross-welds. This paper contributes to the specific knowledge and the methodology. It anticipates that this methodology will find its value and application in modelling other fractures such as ductile and fatigue.

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“…Recently, synchrotron micro-tomography has been used to investigate the cavitation of high Cr steel [5][6][7], and continuous cavity nucleation and cavity growth models were calibrated by Xu et al [8] and an explicit creep fracture model, based on the coalescence of grain boundary cavities was derived [8]. The applicability of Xu's creep fracture lifetime model to a stress range of 120 MPa to 180 MPa and a lifetime of 2825 to 51,406 h, has been demonstrated with 87% of accuracy [9].…”

Section: Introductionmentioning

confidence: 99%

Development of the FE In-House Procedure for Creep Damage Simulation at Grain Boundary Level

2019

Metals

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A two-dimensional (2D) finite element framework for creep damage simulation at the grain boundary level was developed and reported. The rationale for the paper was that creep damage, particularly creep rupture, for most high temperature alloys is due to the cavitation at the grain boundary level, hence there is a need for depicting such phenomenon. In this specific development of the creep damage simulation framework, the material is modeled by grain and GB (grain boundary), separately, where smeared-out grain boundary element is used. The mesh for grain and grain boundary is achieved by using Neper software. This paper includes (1) the computational framework, the existing subroutines, and method applied in this procedure; (2) the numerical and programming implementation of the GB; (3) the development and validation of the creep software; and (4) the application to simulate plane stress Copper–Antimony alloy. This paper contributes to the development of finite element simulation for creep damage/rupture at a more realistic grain boundary level and contributes to a new understanding of the intrinsic relationship of stress redistribution and creep fracture.

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Modeling of Creep Deformation and Creep Fracture

Cited by 8 publications

References 27 publications

Recent progress on the modelling of the minimum creep strain rate and the creep cavitation damage and fracture

Recent progress on the modelling of the minimum creep strain rate and the creep cavitation damage and fracture

The development of creep damage constitutive equations for high Cr steel

Development of the FE In-House Procedure for Creep Damage Simulation at Grain Boundary Level

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