通电线圈中磁场与电热效应引起的塑性变形  

Plastic deformation caused by magnetic fields and the Joule heating effect in current-carrying coils

作　　者：唐郡阳 李瀛栩 Tang Junyang;Li Yingxu(School of Mechanics and Aerospace Engineering,Southwest Jiaotong University,Chengdu 611730,China)

机构地区：[1]西南交通大学力学与航空航天学院,成都611730

出　　处：《低温与超导》2024年第12期21-29,共9页Cryogenics and Superconductivity

基　　金：四川省自然科学基金(2022NSFSC2010);中央高校基本科研业务费理科培育专项(2682023ZTPY010)资助。

摘　　要：本文探讨了电流通过超导线圈时,洛伦兹力与热应力对线圈力学行为的影响。通过有限元分析,结合弹性力学方程分析了电流引起的温差和磁场作用下的应力分布。线圈通电时,电流向线圈内侧聚集,导致温差形成并引发热应力。热应力和洛伦兹力共同作用时,热应力增强了线圈内侧抗塑性变形能力,但外侧区域更容易进入塑性状态。结果表明热应力的存在使得超导线圈整体的抗塑性能力减弱,设计超导线圈时,需综合考虑这些力学效应,本文可为超导线圈的设计提供参考。This influence of Lorentz forces and thermal stresses on the mechanical behavior of superconducting coils were in⁃vestigated when current flowed through them.Using finite element analysis in conjunction with elasticity equations,the stress dis⁃tribution induced by current-induced temperature gradients and magnetic fields was examined.When the coil is energized,the current tends to concentrate towards the inner side of the coil,leading to the formation of temperature gradients and subsequent thermal stresses.The combined effect of thermal stresses and Lorentz forces reveals that the thermal stress enhances the resistance of the coil's inner region to plastic deformation,whereas the outer regions are more susceptible to entering a plastic state.The re⁃sults show that the presence of thermal stresses reduces the overall resistance of the superconducting coil to plastic deformation.Therefore,when designing superconducting coils,it is essential to take these mechanical effects into account.This study can pro⁃vide valuable insights for the design of superconducting coils.

关 键 词：磁场 洛伦兹力 电磁热 热应力 有限元模拟 

分 类 号：O344.3[理学—固体力学]