A Modified Johnson-Cook Model for Ferritic-Pearlitic Steel in Dynamic Strain Aging Regime
AbstractIn this study, the flow stress behavior of ferritic-pearlitic steel (C45E steel) is investigated through isothermal compression testing at different strain rates (1 s−1, 5 s−1, and 60 s−1) and temperatures ranging from 200 to 700 °C. The stress-strain curves obtained from experimental testing were post-processed to obtain true stress-true plastic strain curves. To fit the experimental data to well-known material models, Johnson-Cook (J-C) model was investigated and found to have a poor fit. Analysis of the flow stress as a function of temperature and strain rate showed that among other deformation mechanisms dynamic strain aging mechanism was active between the temperature range 200 and 400 °C for varying strain rates and J-C model is unable to capture this phenomenon. This lead to the need to modify the J-C model for the material under investigation. Therefore, the original J-C model parameters A, B and n are modified using the polynomial equation to capture its dependence on temperature and strain rate. The results show the ability of the modified J-C model to describe the flow behavior satisfactorily while dynamic strain aging was operative. View Full-Text
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Moris Devotta, A.; Sivaprasad, P.V.; Beno, T.; Eynian, M.; Hjertig, K.; Magnevall, M.; Lundblad, M. A Modified Johnson-Cook Model for Ferritic-Pearlitic Steel in Dynamic Strain Aging Regime. Metals 2019, 9, 528.
Moris Devotta A, Sivaprasad PV, Beno T, Eynian M, Hjertig K, Magnevall M, Lundblad M. A Modified Johnson-Cook Model for Ferritic-Pearlitic Steel in Dynamic Strain Aging Regime. Metals. 2019; 9(5):528.Chicago/Turabian Style
Moris Devotta, Ashwin; Sivaprasad, P. V.; Beno, Tomas; Eynian, Mahdi; Hjertig, Kjell; Magnevall, Martin; Lundblad, Mikael. 2019. "A Modified Johnson-Cook Model for Ferritic-Pearlitic Steel in Dynamic Strain Aging Regime." Metals 9, no. 5: 528.
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