Use of Prandtl operators in simulating the cyclic softening of Inconel 718 under isothermal low-cycle fatigue loading
ID Bartošák, Michal (Author), ID Nagode, Marko (Author), ID Klemenc, Jernej (Author), ID Doubrava, Karel (Author), ID Šeruga, Domen (Author)

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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.

Keywords:Prandtl operators, low-cycle fatigue, plasticity, nickel-based super-alloy, Inconel 718
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publication status in journal:Published
Article version:Postprint, final article version, accepted into publication
Number of pages:11 str.
Numbering:Vol. 222, art. 107182
PID:20.500.12556/RUL-135896 This link opens in a new window
ISSN on article:0020-7403
DOI:10.1016/j.ijmecsci.2022.107182 This link opens in a new window
COBISS.SI-ID:102892035 This link opens in a new window
Publication date in RUL:31.03.2022
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Record is a part of a journal

Title:International journal of mechanical sciences
Shortened title:Int. j. mech. sci.
COBISS.SI-ID:25648384 This link opens in a new window


License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:16.03.2022

Secondary language

Keywords:Prandtlovi operatorji, nikljeva zlitina, ciklično mehčanje, utrujanje


Funder:Drugi - Drug financer ali več financerjev
Funding programme:Czech Science Foundation (CSF)
Project number:GA21-06645S

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Project number:P2-0182
Name:Razvojna vrednotenja

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