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Unified viscoplasticity modelling for isothermal low-cycle fatigue-creep, creep and thermo-mechanical fatigue of SiMo cast iron

A modified unified viscoplastic material model is proposed for simulating stress-strain response of ductile cast iron under low-cycle fatigue-creep, creep and thermo-mechanical fatigue loading conditions. The constitutive model is based on the non-linear kinematic hardening rule of Chaboche, in which several features are added in order to incorporate strain rate sensitivity, the strain range dependency of the cyclic hardening/softening and the elastic modulus, static recovery and mean stress evolution. In addition, the constitutive model is coupled with isotropic damage variable. The model is calibrated and validated from creep rupture tests and from strain-controlled experiments that were performed for various temperatures up to 650°C, for various strain ranges and strain rates, with…

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A modified unified viscoplastic material model is proposed for simulating stress-strain response of ductile cast iron under low-cycle fatigue-creep, creep and thermo-mechanical fatigue loading conditions. The constitutive model is based on the non-linear kinematic hardening rule of Chaboche, in which several features are added in order to incorporate strain rate sensitivity, the strain range dependency of the cyclic hardening/softening and the elastic modulus, static recovery and mean stress evolution. In addition, the constitutive model is coupled with isotropic damage variable. The model is calibrated and validated from creep rupture tests and from strain-controlled experiments that were performed for various temperatures up to 650°C, for various strain ranges and strain rates, with and without a strain dwell. A good correlation was achieved between the simulated results and the experimental results.

Reference
LCF9-2022-065

Title
Unified viscoplasticity modelling for isothermal low-cycle fatigue-creep, creep and thermo-mechanical fatigue of SiMo cast iron
Author(s)
M. Bartošák, J. Horváth, O. Havlíček, M. Španiel
DOI
10.48447/LCF9-2022-065
Event
LCF9 - Ninth International Conference on Low Cycle Fatigue
Year of publication
2022
Publication type
conference paper (PDF)
Language
English
Keywords
Viscoplasticity,Low-cycle fatigue,Fatigue-creep,Creep,Thermo-mechanical fatigue