20.500.12556/RUL-135896 Use of Prandtl operators in simulating the cyclic softening of Inconel 718 under isothermal low-cycle fatigue loading In this article, a new approach is proposed for modelling the stressstrain response of the Inconel 718 super-alloy under isothermal Low-Cycle Fatigue (LCF) loading. The proposed constitutive model is based on the Prandtl operator approach, in which a set of modifications is introduced in order to simulate strain range dependent cyclic softening. A new simulation capability is introduced by evolving the yield strains of the individual hysteresis operators with an accumulated plastic strain. In addition, the effect of the strain range dependency of cyclic softening is introduced into the proposed constitutive model by coupling its parameters with the concept of the plastic strain memory surface. These introduced modifications preserve the main advantages of the Prandtl operators, such as a small number of model parameters, their fast determination from the cyclic stressstrain curve, and a high computational speed, when used to simulate complex non-linear mechanical behaviour. Finally, the prediction capability of the proposed model is illustrated by various strain controlled tests performed at 500 °C, including block spectrum loading and variable strain amplitude loading. Prandtl operators low-cycle fatigue plasticity nickel-based super-alloy Inconel 718 Prandtlovi operatorji nikljeva zlitina ciklično mehčanje utrujanje true false true Angleški jezik Slovenski jezik Članek v reviji 2022-03-31 09:53:05 2022-03-31 09:53:08 2022-09-15 04:12:41 0000-00-00 00:00:00 2022 0 0 11 str. Vol. 222, art. 107182 May 2022 0000-00-00 PostprintKoncna Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 2024-03-16 620.178.3:669.018.2 0020-7403 10.1016/j.ijmecsci.2022.107182 102892035 RAZ_Bartosak_Michal_2022.pdf RAZ_Bartosak_Michal_2022.pdf 1 4014752873EEEAB74F79EB59A7967D91 0e58f299db26098365410bc47894497b9429da59e3f4c961687c11cda5814e92 1f8f5c16-b0c8-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=155159 https://www.sciencedirect.com/science/article/pii/S0020740322001072 1 9501d3db-b0c7-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=155157 Fakulteta za strojništvo 0 0 0