20.500.12556/RUL-171618 Pregled materialnih modelov za modeliranje plastičnega obnašanja materiala pri udarnih obremenitvah v Abaqusu Overview of material models for modeling plastic behaviour of materials under impact loading in Abaqus Zaključno delo obravnava problematiko simuliranja visokohitrostnih deformacij, ki nastopijo ob udarnih obremenitvah materiala. V takšnih pogojih material doživi izrazito plastičen odziv, ki ga spremljajo kompleksni mehanski in termični pojavi. Klasični (kvazi)statični modeli v teh primerih ne zadoščajo, zato je za zanesljivo napoved odziva potrebno uporabiti napredne konstitutivne modele, ki vključujejo vpliv hitrosti deformacije in. V začetku zaključnega dela so predstavljene teoretične osnove visokohitrostnih deformacij in materialnih modelov, ki so na volju v Abaqusu. V eksperimentalnemu delu smo primerjali modela utrjevanja Johnson-Cook ter \textit{Isotropic}, kjer smo modela primerjali na primeru trka krogle v pločevino. Materialna modela smo primerjali po količini plastične deformacije, času reševanja, doseženi temperaturi v telesih ter po vizualnem izgledu končnega stanja simulacije. Pri tem smo izmerili, da uporaba modela \textit{Isotropic} rezultira v krajšem času reševanja. Poleg tega smo ugotovili, da rezultati simulacije niso vezani toliko na uporabljen konstitutivni model kot na ustrezne vhodne materialne parametre, ki jih uporabimo za popis obnašanja materiala. The thesis addresses the problem of simulating high-speed deformations that occur under impact loading of a material. In such conditions, the material undergoes a pronounced plastic response accompanied by complex mechanical and thermal phenomena. Classical (quasi-)static models are insufficient in these cases therefore, for reliable prediction of the response, it is necessary to use advanced constitutive models that account for the effects of strain rate and temperature. At the beginning of the thesis, the theoretical foundations of high-speed deformations and the material models available in Abaqus are presented. In the experimental part, we compared the Johnson–Cook hardening model with the Isotropic model, using as a case study the impact of a sphere on a metal sheet. The two material models were compared in terms of the amount of plastic deformation, the computation time, the temperature reached in the bodies, and the visual appearance of the final simulation state. We found that using the Isotropic model results in a shorter solution time. Furthermore, we concluded that the simulation results depend less on the chosen constitutive model than on the appropriate input material parameters used to describe the material’s behavior. visokohitrostne deformacije udarne obremenitve modeliranje deformacij materialni modeli modeli plastičnosti dinamične simulacije model Johnson-Cook Abaqus high-speed deformations impact loads deformation modeling material models plasticity models dynamic simulations Johnson-Cook model Abaqus true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2025-08-29 08:31:01 2025-08-29 08:31:05 2025-09-09 04:02:01 0000-00-00 00:00:00 2025 0 0 XIV, 55 f. 2025 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 620.172.254:519.6:004.942(043.2) 274969 247704835 43115.pdf 43115.pdf 1 5EF48DFD864C45AE1F1171576A1BCD29 0b4b71259f01f1af0775aa1272ab81a023f4bc37b429ab88e967e221ba175c18 9c76148a-84a1-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=214998 Fakulteta za strojništvo 0 0 0