[WBP1] Conductor Processing & Evaluation

[WBP1-02] Finite Element Modeling of Bi-based Superconducting Wire Drawing Process

*Xueqian Liu¹, Shengnan Zhang¹, Jianfeng Li¹, Jixing Liu¹, Guo Yan^1,2, Xianghong Liu^1,2, Chengshan Li¹, Pingxiang Zhang¹ (1. Northwest Institute for Non-ferrous Metal Research (China), 2. Western Superconducting Technologies Co.,Ltd. (China))

Keywords:

Bismuth-based HTS wires,Powder-in-tube,Finite element modeling,Wire drawing

Bismuth-based superconducting wires, such as Bi-2212 and Bi-2223, play a crucial role in high-field magnet and power applications. In this work, a macro-scale finite element modeling (FEM) framework is developed to investigate the powder compaction and filament deformation behavior during wire fabrication. The study focuses on two main aspects: (i) modeling the powder densification in mono-filament wires under deformation processes, incorporating the Drucker-Prager Cap (DPC) model to capture the plastic compaction behavior of Bi-based powders; and (ii) simulating filament interactions in multi-filamentary wires, evaluating stress distribution, filament distortion, and local density evolution under typical drawing and rolling schedules. Equivalent plastic strain, contact pressure, and density distribution are used as key evaluation metrics to assess the process performance. The simulation results reveal the influence of process parameters such as reduction rate, pass schedule, and sheath material properties on filament compaction and mechanical uniformity. This modeling approach provides a predictive tool for optimizing deformation processes, aiming to improve powder densification, reduce filament defects, and enhance the overall critical current performance of Bi-based superconducting wires.