A unified viscoplastic constitutive model with damage for multi-axial creep–fatigue loading

Wz, Wang; Buhl, Patrick M.; Klenk, Andreas

doi:10.1177/1056789514537007

Cited by 31 publications

(16 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The interaction between creep and fatigue loading, which is important for high temperature cyclic conditions, has also been investigated using a number of approaches, including strain range partitioning and linear damage summation. [34][35][36][37] A key challenge for the case of 9Cr steels, which cyclically soften due to microstructure evolution, is the identification of fatigue damage evolution for prediction of crack initiation and hence failure.…”

Section: Introductionmentioning

confidence: 99%

Fatigue damage characterisation of MarBN steel for high temperature flexible operating conditions

O'Hara

Harrison

Polomski

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part L:

View full text Add to dashboard Cite

This paper is concerned with the high temperature low cycle fatigue behaviour of a new nanostrengthened martensitic-ferritic steel, MarBN. A range of strain-controlled, low cycle fatigue tests are presented on MarBN at 600 °C and 650 °C, and compared with previously published data for a current state-of-the-art material, P91 steel, including microstructural analysis of the fracture mechanisms. A modified Chaboche damage law, incorporating Coffin-Manson life prediction, is implemented within a hyperbolic sine unified cyclic viscoplastic constitutive model. Calibration and validation of the model with respect to the effects of strain-rate and strain-range is performed based on an optimisation procedure for identification of the material parameters. The cyclic viscoplasticity model with damage successfully predicts fatigue damage evolution and life in the cyclically-softening materials, MarBN and P91.

show abstract

Section: Introductionmentioning

confidence: 99%

Fatigue damage characterisation of MarBN steel for high temperature flexible operating conditions

O'Hara

Harrison

Polomski

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part L:

View full text Add to dashboard Cite

show abstract

“…Experimental data were assessed at temperatures of 550°C, 600°C and 625°C (these are common operating temperatures for power-plant materials), with three stress levels considered for each temperature. Further details of the experimental procedure are available in (Wang et al, 2015).…”

Section: Damage Assessment and Evolutionmentioning

confidence: 99%

Coupling crystal plasticity and continuum damage mechanics for creep assessment in Cr-based power-plant steel

Zhao

Roy

Wang

et al. 2019

Mechanics of Materials

View full text Add to dashboard Cite

To improve the design and safety of power plant components, long-term hightemperature creep behaviour of a power-plant material, such as Cr-based alloy, should be assessed. Prior studies indicate that power-plant components undergo material degradation and premature failure by nucleation, growth and coalescence of microvoids as a result of creep damage. In classical crystal-plasticity-based models, a flow rule and a hardening law do not account for global stiffness degradation of materials due to evolving microvoids, having a significant influence on material behaviour, especially under large deformations. In this study, a crystal-plasticity scheme coupled with an appropriate continuum damage model is developed to capture the anisotropic creep-damage effect on the overall deformation behaviour of Cr-based power-plant steel. Numerical simulations show that the developed approach can characterize creep deformation of the material exposed to a range of stress levels and temperatures under consideration of stiffness degradation under large deformation.

show abstract

“…Many engineering components, such as airplane engines, gas turbines, steam turbines and boilers, are generally subjected to thermo-mechanical loads, especially during the start-up and shut-down procedures, in which the mechanical and thermal cyclic loading simultaneously exist (Roy et al, 2015;Wang et al, 2015Wang et al, , 2016. It will seriously shorten the lifetime and lead to the failure of these components.…”

Section: Introductionmentioning

confidence: 99%

Life prediction approach based on the isothermal fatigue and creep damage under multiaxial thermo-mechanical loading

Ren

Shang

et al. 2018

International Journal of Damage Mechanics

View full text Add to dashboard Cite

Based on the isothermal fatigue and creep damage, a life prediction approach under multiaxial thermo-mechanical loading was proposed in this investigation. In the proposed method, the multiaxial thermo-mechanical fatigue damage during one cycle period was divided into the isothermal fatigue damage and the creep damage. In order to evaluate conservatively, the isothermal fatigue damage during one cycle period was calculated by using multiaxial fatigue damage model at the maximum temperature during the whole period, and the creep damage during one cycle period was calculated by accumulating the creep damage of all portions originated from the divided time history for the axial load component and temperature history. The life prediction results by the proposed model showed a good agreement with experimental data for nickel-base alloy GH4169 and cobalt-base Haynes188 under axial-torsional thermo-mechanical loading.

show abstract

A unified viscoplastic constitutive model with damage for multi-axial creep–fatigue loading

Cited by 31 publications

References 25 publications

Fatigue damage characterisation of MarBN steel for high temperature flexible operating conditions

Fatigue damage characterisation of MarBN steel for high temperature flexible operating conditions

Coupling crystal plasticity and continuum damage mechanics for creep assessment in Cr-based power-plant steel

Life prediction approach based on the isothermal fatigue and creep damage under multiaxial thermo-mechanical loading

Contact Info

Product

Resources

About