Article (Scientific journals)
Implementation of a modified Graham-Walles viscosity function within a Chaboche viscoplastic constitutive model
Rojas Ulloa, Carlos Eduardo; Morch, Hélène; Tuninetti, Víctor et al.
2024In Computers and Mathematics with Applications, 155, p. 165-175
Peer reviewed


Full Text
Author postprint (1.41 MB) Creative Commons License - Attribution, Non-Commercial, No Derivative
This document contains all the information of the published version. Changes applied after the peer-review process are highlighted in yellow.

All documents in ORBi are protected by a user license.

Send to


Keywords :
Creep damage; Creep mechanism transition; Creep micromechanics; Incoloy 800H
Abstract :
[en] This work provides a numerical framework for the accurate prediction of operational life of metallic components exhibiting a non-classical creep behavior under constant loadings and very high temperature. A modified Graham-Walles type analytical viscoplastic function is implemented into a Chaboche unified viscoplastic constitutive model. The numerical model is integrated into the finite element software Lagamine following a fully-implicit two-step radial return mapping algorithm. The non-linear system of equations is solved using a robust Newton-Raphson method. The computational efficiency of the model is enhanced by implementing a sub-step routine, thereby decreasing the average number of iterations of the finite element software. The validation of the model is performed using experimental data available in the literature on the non-classical creep behavior of Incoloy 800H, a Ni-superalloy exhibiting a two-step creep strain rate minima attributed to multiple complex dislocation-precipitate interactions.
Research center :
MSM - Materials and Solid Mechanics team - ULiège[BE]
Disciplines :
Mechanical engineering
Computer science
Author, co-author :
Rojas Ulloa, Carlos Eduardo  ;  Université de Liège - ULiège > Urban and Environmental Engineering
Morch, Hélène  ;  Université de Liège - ULiège > Faculté des Sciences Appliquées > Form. doct. sc. ingé. & techn. (archi., gén. civ. - paysage)
Tuninetti, Víctor;  UFRO - University of La Frontera [CL] > Mechanical Engineering Department > Assistant Professor
Duchene, Laurent  ;  Université de Liège - ULiège > Département ArGEnCo > Analyse multi-échelles dans le domaine des matériaux et structures du génie civil
Habraken, Anne  ;  Université de Liège - ULiège > Département ArGEnCo > Département Argenco : Secteur MS2F
Language :
Title :
Implementation of a modified Graham-Walles viscosity function within a Chaboche viscoplastic constitutive model
Publication date :
01 February 2024
Journal title :
Computers and Mathematics with Applications
Publisher :
Elsevier BV
Special issue title :
Volume :
Pages :
Peer reviewed :
Peer reviewed
Development Goals :
9. Industry, innovation and infrastructure
Name of the research project :
Development of a generic MultiScale Creep-Fatigue approach, allowing finite element simulations to predict strains and fracture of metal components at high temperature- application on 800H alloy
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
FRIA - Fund for Research Training in Industry and Agriculture [BE]
WBI - Wallonia-Brussels International [BE]
Funding number :
FRIA 4000-8987; WBI/AGCID RI-02 (DIE-0001)
Funding text :
This work is funded by FNRS throughout the FRIA grant N° 4000-8987 and WBI/AGCID RI02 (DIE23-0001). As research director of F.R.S.-FNRS, A.M. Habraken thanks the Fund for Scientific Research for financial support.
Commentary :
This work was published as part of a special issue of CAMWA Journal, with motive of the 8th version of the International Conference of Advanced Computational Methods in Engineering (ACOMEN), held in Liège (BE) during August-September of 2022. The article presents the adaptation of a UVCM to enable the prediction of complex creep responses of Materials. We apply the model for the prediction of creep curves of Incoloy 800H found in literature. The simulations achieve good accuracy.
Available on ORBi :
since 19 December 2023


Number of views
22 (3 by ULiège)
Number of downloads
14 (0 by ULiège)

Scopus citations®
Scopus citations®
without self-citations


Similar publications

Contact ORBi