The development of creep damage constitutive equations for high Cr steel

Zheng, Xuming; Xu, Qiang; Lu, Joan; Wang, Xue; Feng, Xi‐Qiao

doi:10.1080/09603409.2020.1716145

Cited by 16 publications

(10 citation statements)

References 16 publications

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“…Referring back to equation (11), the five cavitation coefficients and the creep cavitation damage lifetime coefficient U ' ' can be obtained from an early interrupted creep test without the need to wait to the rupture. This section explores such possibility.…”

Section: Time-base Lifetime Extrapolation Methodsmentioning

confidence: 99%

“…Due to the generic nature of this form of law, it is expected it can be used for other materials and temperature. In fact, this form of law has been already used successfully in other research work with other high Cr steels [11,20,52] and low Cr steel [53].…”

Section: Experiments Datamentioning

confidence: 98%

“…Consequently, the modelling of cavitation rupture time over a wider stress level (subtask No. 4) was initiated [11], building up on the on the success of the above sub-task No. 2.…”

Section: Introductionmentioning

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: Time-base Lifetime Extrapolation Methodsmentioning

confidence: 99%

Section: Experiments Datamentioning

confidence: 98%

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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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“…During the tertiary creep a consistent increase of the creep rate is registered until failure. Few works on the topic of creep fracture are reported in [23][24][25][26][27][28]. The present paper focuses the attention in reviewing the first fracture process.…”

Section: Damage Definitionsmentioning

confidence: 99%

Ductile fracture modeling of metallic materials: a short review

Fincato

Tsutsumi

2021

Frattura Ed Integrità Strutturale

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Since the end of the last century a lot of research on ductile damaging and fracture process has been carried out. The interest and the attention on the topic are due to several aspects. The margin to reduce the costs of production or maintenance can be still improved by a better knowledge of the ductile failure, leading to the necessity to overcome traditional approaches. New materials or technologies introduced in the industrial market require new strategies and approaches to model the metal behavior. In particular, the increase of the computational power together with the use of finite elements (FE), extended finite elements (X-FE), discrete elements (DE) methods need the formulation of constitutive models capable of describing accurately the physical phenomenon of the damaging process. Therefore, the recent development of novel constitutive models and damage criteria. This work offers an overview on the current state of the art in non-linear deformation and damaging process reviewing the main constitutive models and their numerical applications.

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“…The standard approach implies that creep life and creep design can be largely managed with these variables, without expressing the levels of strain or cavitation damage. However, the measured level of strain or cavitation damage can usefully indicate the structural condition at in-service inspections [42,43], and the cavitation damage can be modelled in more detail for such or other purposes with or without the expressed strain [29,[44][45][46].…”

Section: Evolution Of Life-limiting Damage In High Temperature Servicementioning

confidence: 99%

Modelling for Creep Cavitation Damage and Life of Three Metallic Materials

Pohja

Auerkari

Vilaça

2022

Materials at High Temperatures

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Metallic structures operating at high temperatures can have creep as a life-limiting mechanism. The limit can arise by nucleation and growth of creep cavities that eventually merge becoming the leading damage of the fracture mechanisms. Understanding and modelling for creep cavitation can therefore help in prediction of structural safety and condition of such structures. The present paper will introduce a new model to predict creep cavitation damage so that the associated creep strain is also modelled out of the predictive expression without losing accuracy in the time to critical damage and corresponding residual life. The model was verified for OFHC copper, low-alloy 0.5CMV steel and higher-alloy X20 steel, to cover a wide range of polycrystalline metals and their microstructures. The new model performed as well as or better than the classical approach which requires access to measured strain. The model was applied to predict creep cavitation damage from time, stress and temperature as predictive variables.

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The development of creep damage constitutive equations for high Cr steel

Cited by 16 publications

References 16 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

Ductile fracture modeling of metallic materials: a short review

Modelling for Creep Cavitation Damage and Life of Three Metallic Materials

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