Finite element analysis on electromagnetic forming of DP780 high-strength steel sheets

Liu, Dahai; Li, Bo; Guo, Zeqing; Huang, Zengxin

doi:10.1007/s00170-020-06537-7

Cited by 3 publications

(4 citation statements)

References 17 publications

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“…It can be seen from the above research that, in order to accurately predict the flow stress of 34CrNi3Mo steel under high temperature deformation with the help of the Arrhenius-type constitutive model, the interaction between strain, deformation temperature, and strain rate on model parameters must be considered simultaneously. Therefore, the modified Arrhenius-type model can be rewritten as [ 18 ],

where the material parameter n and the stress level parameter α are the functions of strain and deformation temperature, namely,

, the deformation activation energy Q and the material parameter A are the functions of strain, strain rate, and deformation temperature, namely,

.…”

Section: Constitutive Modelmentioning

confidence: 99%

“…To overcome this shortcoming, scholars established a modified Johnson–Cook model coupled with strain rate and deformation temperature [ 15 ]. With the modified Johnson–Cook model, the flow stress of aluminum alloy [ 16 ], magnesium alloy [ 17 ], and high strength steel [ 18 ] is accurately predicted under the condition of high temperature deformation. In addition, the application of an artificial neural network model based on experimental data and phenomena in the prediction of material flow stress is also gradually expanding [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

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Deformation Behavior and Constitutive Model of 34CrNi3Mo during Thermo-Mechanical Deformation Process

Jia

Zhou

2022

Materials

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With higher creep strength and heat resistance, 34CrNi3Mo has been widely used in the production of engine rotors, steam turbine impellers, and turbine blades. To investigate the hot deformation behaviors of 34CrNi3Mo steel, hot compressive tests were conducted on a Gleeble-3500 thermomechanical simulator, under the temperature range of 1073 K–1373 K and strain rate ranges of 0.1 s−1–20 s−1. The results show that the flow stress of 34CrNi3Mo steel under high temperatures is greatly influenced by the deformation temperature and strain rate, and it is the result of the interaction between strain hardening, dynamic recovery, and recrystallization. Under the same deformation rate, as the deformation temperature increases, the softening effect of dynamic recrystallization and dynamic recovery gradually increases, and the flow stress gradually decreases. Under the same deformation temperature, with the increase of strain rate, the influence of strain hardening on 34CrNi3Mo steel is gradually in power, and the flow stress gradually increases. To predict the flow stress of 34CrNi3Mo steel accurately, a modified Arrhenius-type constitutive model considering the effects of strain, temperature, and strain rate at the same time was made based on the experiment data. On this basis, the evolution law of deformation activation and instability characteristics of 34CrNi3Mo steel were investigated, and the processing map of 34CrNi3Mo steel was established. The formability of 34CrNi3Mo steel under high temperature deformation was revealed, which provided a theoretical foundation of the equation of reasonable hot working process.

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where the material parameter n and the stress level parameter α are the functions of strain and deformation temperature, namely,

, the deformation activation energy Q and the material parameter A are the functions of strain, strain rate, and deformation temperature, namely,

.…”

Section: Constitutive Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Deformation Behavior and Constitutive Model of 34CrNi3Mo during Thermo-Mechanical Deformation Process

Jia

Zhou

2022

Materials

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“…[21] is a finite element program capable of structural analysis using electromagnetic fields. This is facilitated through the "EM" keyword [22][23][24], which operates based on Maxwell's equations [25]. The analysis model consists of the necessary components for the forming process, including the forming coil, blank, die representing the target shape, and holder for the blank.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Electromagnetic Hydraulic Forming Process to Overcome Limitations of Electromagnetic Forming Process

Kim,

Kim

2024

Materials

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This paper provides a comparison between the conventional Electromagnetic Forming (EMF) technique and the novel Electromagnetic Hydraulic Forming (EMHF) approach. The EMHF involves the use of finite element analysis coupled with the EM and arbitrary Lagrangian–Eulerian techniques analyzed through LS-DYNA. In the free-bulge configuration, EMF is influenced by the forming coil, resulting in a dead zone and uneven forming. Additionally, EMF can only be used to shape materials with high electrical conductivity. In contrast, EMHF, driven by induced hydraulic pressure from the electromagnetic field-affected drive sheet, is independent of the electrical conductivity of the material and produces dome-shaped workpieces. For rectangular die shapes, EMF is prone to collision owing to the acceleration of the blank, which results in a reduced quality owing to bouncing. However, EMHF exhibits no bouncing effect and successfully achieves the target shape in most cases. The two techniques differ in the strain rate, with EMF at 4850/s, whereas EMHF operates at approximately 1250/s. Despite being slower, EMHF is still a high-speed forming technique. In conclusion, EMHF is a promising technique capable of addressing the shortcomings of conventional EMF and achieving improvements in forming processes.

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“…Liu et al [7] carried out a numerical and experimental study on the EMF of DP780 high strength steel sheets. The effects of strain rate on the DP780 mechanical properties were analyzed by quasi-static tensile test and Hopkinson bar test.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigations on Strains of Metal Sheet Parts Processed by Electromagnetic Forming

Luca,

Luca

2023

JMMP

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Electromagnetic forming is applied to form metal sheet parts from both non-ferrous and ferrous materials. In this paper, the electromagnetic forming behavior of aluminum alloy, copper and steel sheets was investigated through experiments. The disk-shaped specimens were electromagnetically free bulged with increasing deformation energies and parts with different deformation depths were obtained. The deformation was done with and without clamping the movement of the specimens’ edges. The specimens were printed with a mesh of diametrical lines and concentric circles with a predetermined pitch. The mesh served to determine the displacements in the mesh nodes after the deformation of the specimens, with which the axial, radial and circumferential strains were then calculated. The experimental data obtained was subjected to statistical correlation and regression analyses, and the mathematical models for the three main strains in each material were established. The strains of AlMn0.5Mg0.5 and Cu-OF parts are maximum in the center and have a similar variation, while the FeP04 parts have the maximum strains in an intermediate zone between the center and the edge.

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Finite element analysis on electromagnetic forming of DP780 high-strength steel sheets

Cited by 3 publications

References 17 publications

Deformation Behavior and Constitutive Model of 34CrNi3Mo during Thermo-Mechanical Deformation Process

Deformation Behavior and Constitutive Model of 34CrNi3Mo during Thermo-Mechanical Deformation Process

Numerical Study on Electromagnetic Hydraulic Forming Process to Overcome Limitations of Electromagnetic Forming Process

Experimental and Numerical Investigations on Strains of Metal Sheet Parts Processed by Electromagnetic Forming

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