20.500.12556/RUL-176479 Interspace minimisation for optimal description of temperature-dependent nonlinear material behaviour This paper focuses on optimisation of material parameters to describe the elastoplastic stress–strain relationship in finite element solvers. Two new methods are introduced to minimise the numerical error that occurs in the interspace between the experimental cyclic stress–strain curve and its representation using multilinear interpolation. Specifically, both methods are integrated into a Prandtl operator approach, which can be used to simulate the elastoplastic response of mechanical components subjected to variable thermomechanical loadings. The improvement as compared to standard interpolation is most substantial when the number of yield planes is limited, especially in the case of bilinear stress–strain curves. The innovation of this study is an algorithm that optimises positions of the stress–strain points across the temperature range of interest considering several input temperatures. It is shown that these methods are especially applicable for optimisation of material parameters when the stress–strain curves are available for a range of test temperatures that are needed for simulating thermomechanical fatigue. The improvement in the interpolation using these methods is exhibited for two materials with available experimental results: stainless steel EN 1.4512 and polyamide PA12. optimisation algorithm finite element method thermomechanical loading plasticity uniaxial fatigue true false true Angleški jezik Ni določen Članek v reviji 2025-12-02 10:16:17 2025-12-02 10:16:28 2025-12-21 04:13:50 0000-00-00 00:00:00 2025 0 0 12 str. iss. 22, art. 12121 Vol. 15 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 536:531/533:620.1 2076-3417 10.3390/app152212121 259533315 Benedicic_Interspace_Minimisation.pdf Benedicic_Interspace_Minimisation.pdf 1 9FD08D17D7C13196DF2368E2BA273214 86ac61bfa1381848b0e13359b3bb6451649effcaa91063d8132a0b568045e72c 6a1352c8-cf5f-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=222827 https://www.mdpi.com/2076-3417/15/22/12121 1 34895111-cf5f-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=222826 Fakulteta za strojništvo 0 0 0