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.
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
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.
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