GH2132高温高应变率下力学性能分析与Johnson-Cook本构模型的建立

doi:10.3969/j.issn.1004-132X.2022.07.015

摘要/Abstract

摘要： 对铁基高温合金GH2132进行了准静态压缩试验和分离式霍普金森压杆（SHPB）试验，获得了该材料在不同温度和应变率下的应力应变曲线，分析了其力学行为。GH2132在准静态压缩过程中出现加工硬化且没有明显的屈服阶段。在SHPB试验中，GH2132有明显的温度软化效应，当应变率在4000～8000 s-1之间时表现出应变率强化效应，而在8000～10 000 s-1范围内表现出应变率软化效应。通过修正温度软化系数和应变率强化参数，建立了GH2132在高温高应变率下的Johnson-Cook本构模型。

关键词: 铁基高温合金, 准静态, 分离式霍普金森压杆, 本构模型

Abstract: Quasi-static compression tests and SHPB tests were carried out on superalloy GH2132, and the stress-strain curves of the materials at different temperatures and strain rates were obtained, and then the mechanics behavior were analyzed. GH2132 has a work hardening and unconspicuous yield stage in quasi-static compression processes. During the SHPB tests, GH2132 shows significant temperature strengthening effectiveness as the strain rate is between 4000 s-1 and 8000 s-1, while the material exhibits strain rate softening effectivenes as the strain rate is between 8000 s-1 and 10 000 s-1, and strain rate softening effectivenes is shown. By modifying temperature softening coefficient and strain rate strengthening parameter, the Johnson-Cook constitutive model of GH2132 with high temperature and high strain rate was established.

Key words: iron-based superalloy, quasi-static, split Hopkinson pressure bars(SHPB), constitutive model

中图分类号:

TG506

田宪华, 闫奎呈, 赵军, 王情情, 王延庆, 陈笑然, . GH2132高温高应变率下力学性能分析与Johnson-Cook本构模型的建立[J]. 中国机械工程, 2022, 33(07): 872-881.

TIAN Xianhua, YAN Kuicheng, ZHAO Jun, WANG Qingqing, WANG Yanqing, CHEN Xiaoran, . Properties at Elevated Temperature and High Strain Rate and Establishment of Johnson-Cook Constitutive Model for GH2132[J]. China Mechanical Engineering, 2022, 33(07): 872-881.

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