Analysis of Proximity Consequences of Coil Windings in Electromagnetic Forming
Analysis of Proximity Consequences of Coil Windings in Electromagnetic Forming
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DOI：
10.3390/jmmp5020045
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发表时间：
2021-06-01
影响因子：
3.2
通讯作者：
Tekkaya, A. Erman
中科院分区：
文献类型：
--
作者：
Goyal, Siddhant Prakash;Lashkari, Mohammadjavad;Tekkaya, A. Erman
多匝线圈用于使用电磁成形（EMF）制造具有不同深度和特殊几何特征的钣金零件。由于线圈匝数较近，观察到了平行线圈绕组间的邻近效应和洛伦兹力等物理现象。这项工作试图调查这些现象的机械后果，使用数值和实验方法。在LS-DYNA中建立了数值模型。实验后和实验过程中，分别使用实验死后应变和基于激光的速度测量进行验证。据观察，在平行导体的邻近效应导致电流密度定位在最近或最远端的导体横截面和高的局部曲率的形成的片材。两个线圈绕组之间的力的进一步分析解释了从文献中观察到的“反距离”规则的偏离。最后，提出了防止或减少线圈变形的措施。
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.