An integrated pseudo-spectral simulation of high-speed discharging at an electromagnetic forming conveying a conductive driver sheet

2018 ◽  
Vol 95 (9-12) ◽  
pp. 4383-4396 ◽  
Author(s):  
Asghar Zajkani
Keyword(s):  
High Speed ◽  
Electromagnetic Forming ◽  
Spectral Simulation ◽  
Pseudo Spectral ◽  
Driver Sheet

Joining of Tubular Parts by Electromagnetic Forming; Experimental Investigations

2014 ◽  
Vol 792 ◽  
pp. 115-120 ◽  
Author(s):  
Pál Rácz ◽  
Nándor Göbl ◽  
Daniel Horváth ◽  
Athanasios G. Mamalis
Keyword(s):  
High Speed ◽  
New Technologies ◽  
Dissimilar Materials ◽  
High Energy ◽  
Mechanical Tests ◽  
Electromagnetic Forming ◽  
High Energy Density ◽  
Experimental Investigations ◽  
Forming Process ◽  
High Speed Forming

Electromagnetic forming is a high speed forming process, wherein the forming pressure is created by high energy density electromagnetic pulse. Besides direct shaping there are other application areas as well, so electromagnetic plastic forming is a potential field of creating joints between tube and rod-like components. Connecting components of dissimilar materials is an increasing demand in the manufacturing process of structures in the automotive industry. The application of new technologies, such as electrodynamic, especially electromagnetic forming, is a possible method to satisfy these demands. The article summarizes the most important fundamentals of electromagnetic forming; in particular, tube-rod joints, the main types of such joints; interference-fit and form-fit joints are described. Experiments, which were carried out producing tube-rod joints with electromagnetic forming, are also introduced. A new type of form-fit joints for tube-rod connections has been developed, which can withstand not only tensile loads but also torsion. Experiments and mechanical tests have proved the applicability of this kind of joints.

Simulation of Electromagnetic Forming of a Cross-Shaped Cup by Means of a Viscoplasticity Model Coupled with Damage at Finite Strains

2013 ◽  
Vol 554-557 ◽  
pp. 2363-2368 ◽  
Author(s):  
Yalin Kiliclar ◽  
O. Koray Demir ◽  
Ivaylo N. Vladimirov ◽  
Lukas Kwiatkowski ◽  
Stefanie Reese ◽  
...  
Keyword(s):  
Finite Element ◽  
Deep Drawing ◽  
High Speed ◽  
Kinematic Hardening ◽  
Plastic Anisotropy ◽  
Deformation Gradient ◽  
Electromagnetic Forming ◽  
Isotropic Hardening ◽  
Order Structure ◽  
Forming Process

In the field of sheet metal forming traditional forming processes are used. However, a quasi-static forming process combined with a high speed forming process can enhance the forming limits of a single one. In this paper, the investigation of the process chain quasi-static deep drawing – electromagnetic forming by means of a new coupled damage-viscoplasticity model for large deformations is performed. The finite strain constitutive model, used in the finite element simulation combines nonlinear kinematic and isotropic hardening and is derived in a thermodynamically consistent setting. The anisotropic viscoplastic model is based on the multiplicative decomposition of the deformation gradient in the context of hyperelasticity. The kinematic hardening component represents a continuum extension of the classical rheological model of Armstrong–Frederick kinematic hardening. Hill-type plastic anisotropy is modelled by expressing the yield surface as a function of second-order structure tensors as additional tensor-valued arguments. The coupling of damage and plasticity is carried out in a constitutive manner according to the effective stress concept. The constitutive equations of the material model are integrated in an explicit manner and implemented as a user material subroutine in the commercial finite element package of LS-Dyna with the electromagnetical modul. Aim of the work is to show the increasing formability of the sheet by combining quasi-static deep drawing processes with high speed electromagnetic forming process.

Electromagnetic Sheet Bulging: Analysis of Process Parameters by FE Simulations

2013 ◽  
Vol 554-557 ◽  
pp. 741-748 ◽  
Author(s):  
Joao Pedro M. Correia ◽  
Saïd Ahzi
Keyword(s):  
Finite Element ◽  
Process Parameters ◽  
High Speed ◽  
Finite Element Simulations ◽  
Electromagnetic Forming ◽  
Forming Process ◽  
High Speed Forming ◽  
Bulging Test ◽  
High Repeatability

Electromagnetic forming is a non-conventional forming process and is classified as a high-speed forming process. It provides certain advantages as compared to conventional forming processes: improved formability, high repeatability and productivity, reduction in tooling cost and reduction of springback and of wrinkling. However, various process parameters affect the performance of the electromagnetic forming system. Finite element simulations are very useful to optimize a process because they can reduce time and costs. With the aim of investigating the effects of the process parameters on the deformed blank geometry, finite element simulations of an electromagnetic sheet bulging test have been performed in this work. Furthermore the role of first impulse of discharged current is also investigated.

scholarly journals Springback control and large skin manufacturing by high-speed vibration using electromagnetic forming

2021 ◽  
pp. 117340
Author(s):  
Zhihao Du ◽  
Ziqing Yan ◽  
Xiaohui Cui ◽  
Baoguo Chen ◽  
Hailiang Yu ◽  
...  
Keyword(s):  
High Speed ◽  
Electromagnetic Forming ◽  
Springback Control ◽  
Large Skin

Analysis of Fiber Optic Sensor to Measure Velocity During Electromagnetic Forming and Welding

2013 ◽  
Author(s):  
E. Thibaudeau ◽  
B. Turner ◽  
T. Gross ◽  
B. L. Kinsey
Keyword(s):  
High Velocity ◽  
High Speed ◽  
Fiber Optic ◽  
Low Cost ◽  
Electromagnetic Forming ◽  
Fiber Optic Sensor ◽  
Displacement Sensor ◽  
High Speed Photography ◽  
Magnetic Pulse ◽  
Welding Processes

Previous methods of measuring high velocity deformation in electromagnetic forming and magnetic pulse welding include Photon Doppler Velocimetry (PDV), laser micrometers, and high speed photography. In this paper an alternative method is presented, implementing a fiber optic, reflectance dependent displacement sensor. The sensor is shown to be an attractive low cost solution to measurement of high velocities in high voltage, magnetic environments. Data is shown with respect to sensor characterization including various surface reflectivity values, curvatures, and misalignments; implementation in two forming and welding processes; and verification with high velocity measurement in parallel with PDV. The sensor system is one twentieth the cost of a PDV system, and yet measures velocities accurately to at least 140 m/s. Sensor performance is also enhanced by the use of retroreflective tape, which is shown to increase the displacement range by 9×, decrease sensitivity to misalignment, and increase repeatability and ease of implementation.

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