20.500.12556/RUL-156243 Modelling a response of complex-phase steel at high strain rates In this article, a response of the complex-phase high-strength steel SZBS800 was modelled by considering the strain-rate influence. The material’s response was first measured with a series of standard tensile tests at lower strain rates. Higher strain rates were achieved using the unconventional test of shooting the ball into flat specimens. A viscoplastic formulation of the Cowper–Symonds material model was applied to consider the strain-rate effects. The parameters SIGY, p, and C of the material model were estimated using a step-wise procedure. First, rough estimates of the three parameters were obtained from the tensile tests using the grid search method. Then, the parameters p and C were fine-tuned using the reverse engineering approach. With the help of explicit dynamic simulations and all the experimental data, a multi-criteria cost function was defined and applied to obtain a smooth response function for the parameters p and C. Its optimum was determined by a real-valued genetic algorithm. The optimal values of the estimated parameters model the material response well, although a domain of optimum candidates spans two orders of magnitude for the parameter p and a few orders of magnitude for the parameter C. complex phase steel Cowper–Symonds model response surface multi-criterion objective function genetic algorithm jekla s kompleksno mikrostrukturo Cowper–Symondsov model odzivna površina multi-kriterijska ciljna funkcija genetski algoritem true false true Angleški jezik Slovenski jezik Članek v reviji 2024-05-15 13:42:04 2024-05-15 13:42:10 2024-05-16 03:53:24 0000-00-00 00:00:00 2024 0 0 18 str. iss. 10, art. 2302 Vol. 17 May 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 669.14:519.6 1996-1944 10.3390/ma17102302 195509763 Skrlec...-Modelling_a_response_of_complex-phase_steel_at_high_strain_rates.pdf Skrlec...-Modelling_a_response_of_complex-phase_steel_at_high_strain_rates.pdf 1 3A3A31E95D458E89C3552A55CCD8CD90 5096a76056c2dbb98e6865685c75dc2b35f4880ebe7a02c8a4cbedf795e8a3d7 ed40a72d-12b1-11ef-af1f-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=183599 https://www.mdpi.com/1996-1944/17/10/2302 1 2a08039a-12b0-11ef-af1f-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=183598 Fakulteta za strojništvo 0 0 0