Evolution control of cyclic softening of Inconel 718 under isothermal low-cycle fatigue loading by improved calculation of accumulated plastic strain

Šeruga, Domen (avtor), Nagode, Marko (avtor), Klemenc, Jernej (avtor), Doubrava, Karel (avtor), Bartošák, Michal (avtor)

In this article, the approach for modelling the stress–strain response of Inconel 718 superalloy under isothermal Low-Cycle Fatigue (LCF) loading using the Prandtl operator approach is improved by introducing an enhanced evolution control of cyclic softening. The proposed improvement consists of an extended calculation of the accumulated plastic strain which now involves an energy conservation step during the calculation. The simulation power of the Prandtl model is especially improved in the area of increasing low plastic strain range magnitudes which are consistently evolving without regard to the variably changing loading regime. The prediction capability of the proposed model is demonstrated especially for block load tests where the highest discrepancies have been observed before the improvement. Evaluation of the agreement between the experimental observations and the simulations shows up to 6 % better agreement using the improved evolution control of cyclic softening.

• Jezik: Angleški jezik
• Ključne besede: Prandtl operators, low-cycle fatigue, plasticity, nickel-based superalloy, Inconel 718
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Recenzirani rokopis
• Leto izida: 2025
• Št. strani: 11 str.
• Številčenje: Vol. 218, pt. A, art. 105583
• PID: 20.500.12556/RUL-171166
• UDK: 620.178.3:669.018.2
• ISSN pri članku: 0308-0161
• DOI: 10.1016/j.ijpvp.2025.105583
• COBISS.SI-ID: 245631747
• Datum objave v RUL: 14.08.2025

Gradivo je del revije

• Naslov: International journal of pressure vessels and piping
• Skrajšan naslov: Int. j. press. vessels piping
• Založnik: Elsevier
• ISSN: 0308-0161
• COBISS.SI-ID: 8917765

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.

Projekti

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: P2-0182
• Naslov: Razvojna vrednotenja

• Financer: Czech Science Foundation
• Številka projekta: 21-06645S