Cu-Cr-Zr合金动态载流力学性能及其修正Johnson-Cook模型

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关键词： Cu-Cr-Zr 合金；动态载流拉伸；Johonson-Cook模型；电致塑性中图分类号：TM241文献标志码：ADOI：10.7652/xjtuxb202511021 文章编号：0253-987X（2025）11-0218-09

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 electroplastic 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-（r1-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 5.7×108A/m2 . 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.

Keywords： Cu-Cr-Zr alloys； dynamic current-carrying stretching； Johonson-Cook intrinsic model;electroplasticity

电磁轨道发射作为一种新型发射方式，其发射过程中极端的多物理场环境对电磁能材料电学、热学与力学性能提出了严峻的挑战[1-4]。（剩余12232字）