Dynamic Current-Carrying Mechanical Properties of Cu-Cr-Zr Alloy and Its Modified Johnson-Cook Model

LI Weihao; CHEN Li; SHI Hao; LI Chengcheng; ZHOU Jiajing; LIU Hongdi; SHI Huantong; LI Xingwen

doi:10.7652/xjtuxb202511021

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Dynamic Current-Carrying Mechanical Properties of Cu-Cr-Zr Alloy and Its Modified Johnson-Cook Model

更新时间：2025-11-11

- Dynamic Current-Carrying Mechanical Properties of Cu-Cr-Zr Alloy and Its Modified Johnson-Cook Model
- Journal of Xi'an Jiaotong University Vol. 59, Issue 11, Pages: 218-226(2025)
- 作者机构：
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202511021
  CLC： TM241
- Received：04 January 2025，
  
  Published：10 November 2025
- 稿件说明：
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LI Weihao, CHEN Li, SHI Hao, et al. Dynamic Current-Carrying Mechanical Properties of Cu-Cr-Zr Alloy and Its Modified Johnson-Cook Model[J]. Journal of Xi'an Jiaotong University, 2025, 59(11): 218-226.
DOI：

LI Weihao, CHEN Li, SHI Hao, et al. Dynamic Current-Carrying Mechanical Properties of Cu-Cr-Zr Alloy and Its Modified Johnson-Cook Model[J]. Journal of Xi'an Jiaotong University, 2025, 59(11): 218-226. DOI： 10.7652/xjtuxb202511021.

摘要

针对电磁轨道发射装备多场耦合仿真中传统本构模型无法表征载流条件下材料电-力耦合力学行为的问题，提出一种融合电致塑性效应的修正本构模型以提高计算精度。该研究基于霍普金森拉杆实验平台增加了超级电容载流回路，通过高应变率试验缩短有效信号时长避免电磁干扰，并在此平台开展了不同应变率与电流密度下的Cu-Cr-Zr合金动态拉伸试验，获得了相应条件下的应力-应变曲线。实验结果表明：Cu-Cr-Zr合金在动态拉伸条件下的强度显著高于准静态拉伸条件，表现出明显的应变率强化效应；随着电流密度的增加，流动应力逐渐下降，尤其在电流密度达到5.7×10

A/m

时，出现显著的流动应力下降现象，其中屈服强度降低了94MPa，极限强度降低了177.9MPa。基于实验数据，对Johnson-Cook模型修正了应变率强化项并引入了电致塑性项，从而能够有效描述材料在动态载流拉伸条件下的力学行为。修正后的模型预测结果与实验曲线吻合较好，误差小于3.69%，为电磁能装备多物理场计算与材料考核提供了参考。

Abstract

To address the inability of traditional constitutive models to characterize the electromechanical coupling behavior of materials under current-carrying conditions in multi-field coupled simulations of electromagnetic rail launch systems

a modified constitutive model incorporating ele

ctroplastic effects is proposed to improve computational accuracy. A supercapacitor-based current-carrying circuit is integrated into a split Hopkinson tensile bar experimental platform. High-strain-rate tests are conducted to shorten effective signal durations and mitigate electromagnetic interference. Dynamic tensile tests on Cu-Cr-Zr alloy under varying strain rates and current densities are performed

yielding corresponding stress-strain curves. Experimental results demonstrate that the strength of Cu-Cr-Zr alloy under dynamic tensile conditions is significantly higher than under quasi-static conditions

exhibiting notable strain-rate strengthening effects. As current density increases

flow stress gradually decreases

with a pronounced reduction observed at 5.7×10

A/m

.In particular

yield strength decreases by 94MPa and ultimate strength by 177.9MPa. Based on experimental data

the Johnson-Cook model is modified by revising its strain-rate hardening term and introducing an electroplasticity term

effectively capturing the material's mechanical behavior under dynamic current-carrying tension. The modified model shows strong agreement with experimental curves

with an error of less than 3.69%

providing a valuable reference for multi-physics computation and material evaluation in electromagnetic energy equipment.

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references

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