汪振兴,田晓耕,干聪,魏兵辉

• 1:西安交通大学航天航空学院
• 2:西安交通大学材料学院

摘要(Abstract)：

采用材料试验机(MTS-880/25T)和温度控制的霍普金森压杆装置研究了U75V钢在25～700℃和0.0003～8000 s~(-1)应变率下的力学行为进行了单轴压缩实验研究,获得了U75V钢在高温、高应变率动态压缩条件下的应力-应变曲线。利用Johnson-Cook模型对U75V钢动态塑性本构进行拟合,获得了其本构模型参数,发现U75V钢在500～700℃温度范围具有动态应变时效现象。对在2500 s~(-1)应变率及不同温度下霍普金森杆撞击实验的试样组织进行观察,并对其发生动态应变时效的原因进行了分析和讨论。通过引入动态应变时效临界温度T_c和强化系数λ,对经典J-C模型进行了修正。结果表明,修正后的J-C模型参数可以在25～700℃和2500～8000 s~(-1)应变率范围内准确描述U75V钢的动态力学行为。

关键词(KeyWords)： U75V钢;霍普金森杆;Johnson-Cook本构模型;动态应变时效;修正Johnson-Cook模型

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(11732007)

作者(Author): 汪振兴,田晓耕,干聪,魏兵辉

DOI: 10.13289/j.issn.1009-6264.2019-0071

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