Investigation of accurate forming of a semi-ellipsoidal shell part by an electromagnetic forming method

2019 ◽  
Vol 105 (1-4) ◽  
pp. 1113-1128 ◽  
Author(s):  
Ning Liu ◽  
Zhipeng Lai ◽  
Quanliang Cao ◽  
Liang Li ◽  
Xiaotao Han ◽  
...  
Keyword(s):  
Electromagnetic Forming ◽  
Ellipsoidal Shell ◽  
Shell Part

scholarly journals Analysis of Proximity Consequences of Coil Windings in Electromagnetic Forming

2021 ◽  
Vol 5 (2) ◽  
pp. 45
Author(s):  
Siddhant Prakash Goyal ◽  
Mohammadjavad Lashkari ◽  
Awab Elsayed ◽  
Marlon Hahn ◽  
A. Erman Tekkaya
Keyword(s):  
Proximity Effect ◽  
Experimental Methods ◽  
Electromagnetic Forming ◽  
Velocity Measurements ◽  
Local Curvature ◽  
Metal Parts ◽  
Sheet Metal Parts ◽  
Geometrical Features ◽  
Physical Phenomena ◽  
Inverse Distance

Multiturn coils are required for manufacturing sheet metal parts with varying depths and special geometrical features using electromagnetic forming (EMF). Due to close coil turns, the physical phenomena of the proximity effect and Lorentz forces between the parallel coil windings are observed. This work attempts to investigate the mechanical consequences of these phenomena using numerical and experimental methods. A numerical model was developed in LS-DYNA. It was validated using experimental post-mortem strain and laser-based velocity measurements after and during the experiments, respectively. It was observed that the proximity effect in the parallel conductors led to current density localization at the closest or furthest ends of the conductor cross-section and high local curvature of the formed sheet. Further analysis of the forces between two coil windings explained the departure from the “inverse-distance” rule observed in the literature. Finally, some measures to prevent or reduce undesired coil deformation are provided.

scholarly journals The direct MEG problem in the presence of an ellipsoidal shell inhomogeneity

2005 ◽  
Vol 63 (4) ◽  
pp. 601-618 ◽  
Author(s):  
George Dassios ◽  
Fotini Kariotou
Keyword(s):  
Ellipsoidal Shell

Coil-less electromagnetic forming process with uniform-pressure characteristics for shaping sheet metals

2021 ◽  
Vol 70 ◽  
pp. 140-151
Author(s):  
Quanliang Cao ◽  
Xian Li ◽  
Zhenhao Li ◽  
Limeng Du ◽  
Liangyu Xia ◽  
...  
Keyword(s):  
Electromagnetic Forming ◽  
Uniform Pressure ◽  
Sheet Metals ◽  
Forming Process ◽  
Pressure Characteristics
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