Constitutive equations that describe creep stress relaxation for 316H stainless steel at 550°C

Chen, Bo; Smith, David J.; Flewitt, Peter E J; Spindler, M. W.

doi:10.3184/096034011x13119593388654

Cited by 12 publications

(2 citation statements)

References 14 publications

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“…high stress, temperature, irradiation) necessarily relies on predictions of the evolution of stresses, elastic strains and inelastic strains during service. This is usually achieved via the use of finite element (FE)-based mechanical and thermal solvers in which the elastic and inelastic response of the polycrystalline metal is described by a constitutive model [1][2][3][4][5][6]. Ideally, this constitutive model should predict not only the monotonic response of the medium, but also its response under complex loading conditions (e.g.…”

Section: Introductionmentioning

confidence: 99%

Data-Driven Constitutive Model for the Inelastic Response of Metals: Application to 316H Steel

Tallman

Kumar

Castillo

et al. 2020

Integr Mater Manuf Innov

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Predictions of the mechanical response of structural elements are conditioned by the accuracy of constitutive models used at the engineering length-scale. In this regard, a prospect of mechanistic crystal-plasticity-based constitutive models is that they could be used for extrapolation beyond regimes in which they are calibrated. However, their use for assessing the performance of a component is computationally onerous. To address this limitation, a new approach is proposed whereby a surrogate constitutive model (SM) of the inelastic response of 316H steel is derived from a mechanistic crystal plasticity-based polycrystal model tracking the evolution of dislocation densities on all slip systems. The latter is used to generate a database of the expected plastic response and dislocation content evolution associated with several instances of creep loading.From the database, a SM is developed. It relies on the use of orthogonal polynomial regression to describe the evolution of the dislocation content. The SM is then validated against predictions of the dead load creep response given by the polycrystal model across a range of temperatures and stresses. When the SM is used to predict the response of 316H during complex non monotonic loading, extrapolating to new loading conditions, it is found that predictions compare particularly well against those from the physics based polycrystal model.

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Section: Introductionmentioning

confidence: 99%

Data-Driven Constitutive Model for the Inelastic Response of Metals: Application to 316H Steel

Tallman

Kumar

Castillo

et al. 2020

Integr Mater Manuf Innov

View full text Add to dashboard Cite

show abstract

“…This application has provided models with increased accuracy of the life prediction, especially in the presence of geometric discontinuities such as cracks or relaxation of stresses [5]. A variety of different equations, such as RCC-MR [24][25][26], have been used to describe creep deformation for various high temperature steels, e.g. Type 316 [24,[27][28][29], when subjected to different temperatures [5,30].…”

Section: Introductionmentioning

confidence: 99%

Creep deformation and stress relaxation of a martensitic P92 steel at 650 °C

Khayatzadeh

Tanner

Truman

et al. 2017

Engineering Fracture Mechanics

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This paper develops methods to predict creep stress relaxation in the presence of combined boundary conditions and explores the influence of primary-secondary stress dependent creep properties on predictions for a martensitic P92 steel at temperature of 650 °C. A series of forward creep and elastic follow-up experiments have been conducted. A summary is provided of empirical creep equations for forward creep and creep stress relaxation (elastic follow-up) tests, including the link to the experimental procedure. The creep stress relaxation tests have been performed with two rigs to give elastic follow-up factors of 1.17 and 1.7. Both time hardening and strain hardening approaches have been considered where the strain hardening model provided more accurate predictions compared to time hardening; except at relatively low stress levels. The difference between stress relaxations predicted using strain hardening and time hardening approaches are considerable. The model predicts the creep stress relaxation accurately in the early stage of relaxation, indicating that the majority of stress relaxation occurs where primary creep needs to be taken into account. This study highlights the importance of stress dependent creep model to predict stress relaxation, especially with high level of initial residual stresses

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Full-tensor Measurement of Multiaxial Creep Stress Relaxation in Type 316H Stainless Steel

et al. 2021

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Constitutive equations that describe creep stress relaxation for 316H stainless steel at 550°C

Cited by 12 publications

References 14 publications

Data-Driven Constitutive Model for the Inelastic Response of Metals: Application to 316H Steel

Data-Driven Constitutive Model for the Inelastic Response of Metals: Application to 316H Steel

Creep deformation and stress relaxation of a martensitic P92 steel at 650 °C

Full-tensor Measurement of Multiaxial Creep Stress Relaxation in Type 316H Stainless Steel

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