为研究各超导芯在轧制过程中的变形行为,利用有限元分析方法对椭圆截面多芯超导线材的轧制过程进行模拟,通过与试验对比,验证了有限元模型的合理性.模拟结果表明:随着摩擦系数的增大,超导芯的粉体密度和对数应变比(LSR)均降低,且分布均匀性减弱;随着压下率的增加,超导带材的横向应交和纵向应变均增大,超导芯内的粉体密度和LSR值随之增加;同时,大辊径轧制有利于提高超导芯内粉体材料的密实度,并使得LSR值逐渐减少,但前后张力对超导芯变形的影响较小.
In order to investigate the deformation behaviors of superconducting filaments, the finite element method was used to analyze the rolling process of superconducting wires with elliptical section. The feasibility and effectiveness of the finite element model were verified by experimental data. The simulation results show that the powder density, the logarithmic strain ratio ( LSR ) and their distribution uniformity decrease with the increase of the friction coefficient. Larger thickness reduction makes the transversal and longitudinal strain of the superconducting tape increase, meanwhile the powder density and LSR increase. Larger roller diameter is helpful to enhance the powder density and make LSR decrease, while the front/back tension has little influence on the deformation of superconducting filaments.
参考文献
| [1] | 侯炳林,朱学武.高温超导储能应甩研究的新进展[J].低温与超导,2005(03):46-50,54. |
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