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Metals 2019, 9(3), 374; https://doi.org/10.3390/met9030374

On the Development of Material Constitutive Model for 45CrNiMoVA Ultra-High-Strength Steel

1
School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
2
School of Electromechanical and Automotive Engineering, Yantai University, Yantai 264005, China
*
Author to whom correspondence should be addressed.
Received: 28 February 2019 / Revised: 19 March 2019 / Accepted: 21 March 2019 / Published: 22 March 2019
(This article belongs to the Special Issue Multiscale Modeling of Materials and Processes)
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Abstract

For the implementation of simulations for large plastic deformation processes such as cutting and impact, the development of the constitutive models for describing accurately the dynamic plasticity and damage behaviors of materials plays a crucial role in the improvement of simulation accuracy. This paper focuses on the dynamic behaviors of 45CrNiMoVA ultra-high-strength torsion bar steel. According to investigation of the Split-Hopkinson pressure bar (SHPB) and Split-Hopkinson tensile bar (SHTB) tests at different strain rate and different temperatures, 45CrNiMoVA ultra-high-strength steel is characterized by strain hardening, strain-rate hardening and thermal softening effects. Based on the analysis on the mechanism of the experimental results and the limitation of classic Johnson-Cook (J-C) constitutive model, a modified J-C model by considering the phase transition at high temperature is established. The multi-objective optimization fitting method was used for fitting model parameters. Compared with the classic J-C constitutive model, the fitting accuracy of the modified J-C model significantly improved. In addition, finite element simulations for SHPB and SHTB based on the modified J-C model are conducted. The SHPB stress-strain curves and the fracture morphology of SHTB samples from simulations are in good agreement with those from tests. View Full-Text
Keywords: dynamic behaviors; modified J-C model; J-C damage model; phase change; finite element simulation dynamic behaviors; modified J-C model; J-C damage model; phase change; finite element simulation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Hu, X.; Xie, L.; Gao, F.; Xiang, J. On the Development of Material Constitutive Model for 45CrNiMoVA Ultra-High-Strength Steel. Metals 2019, 9, 374.

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