20.500.12556/RUL-134441 Elastoplastic response of a pipe bend using Prandtl operator approach in a finite element analysis Structural components are subjected to variable thermomechanical loads during use. These loads can lead to fatigue failure therefore it is important to detect potential weak points in the structure already during early stages of the R&D process. Reliable results of the stress-strain response are of crucial importance during the structural analyses. In this paper, a metallic pipe bend is subjected to a variable thermomechanical load and its structural response is investigated. The loads reach beyond the yield stress of the material, therefore an elastoplastic stress-strain response is observed. Prandtl operator approach, implemented into the finite element analysis, is used to simulate the response of the pipe bend. The approach enables fast and accurate structural simulations using the material parameters gained from uniaxial low-cycle fatigue testing at few test temperatures. The approach considers a cyclic elastoplastic material behaviour with multilinear kinematic hardening at variable temperatures. Comparison with the commonly used Besseling model shows a comparable stress-strain path simulation, but ensures a 30 % shorter computational time. Fatigue lifetime estimation differs for 4 % at the critical control point for the analysed thermomechanical load history. finite element method thermomechanical loading Prandtl operator plasticity fatigue pipe bends metoda končnih elementov termomehansko utrujanje Prandtlov operator plastičnost utrujanje cevna kolena true false true Angleški jezik Slovenski jezik Članek v reviji 2022-01-14 11:26:54 2022-01-14 11:27:02 2022-09-13 03:55:11 0000-00-00 00:00:00 2022 0 0 Str. 150-158 Vol. 35 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 620.178.3 2452-3216 10.1016/j.prostr.2021.12.059 93442563 93441539 RAZ_Seruga_Domen_2022.pdf RAZ_Seruga_Domen_2022.pdf 1 43C3ED8CE601DB70F699A47F40AF70BA a45a466da0dc6a88924dbc4a58810216f03445f22657d291ff00e6feb3618bb2 4b27f73c-7525-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=152889 https://www.sciencedirect.com/science/article/pii/S2452321621003061 1 549c7aa0-7524-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=152886 Fakulteta za strojništvo 0 0 0