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首页> 外文期刊>Materials Science and Engineering >Constitutive modelling of the flow behaviour of a β titanium alloy at high strain rates and elevated temperatures using the Johnson-Cook and modified Zerilli-Armstrong models
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Constitutive modelling of the flow behaviour of a β titanium alloy at high strain rates and elevated temperatures using the Johnson-Cook and modified Zerilli-Armstrong models

机译：使用Johnson-Cook和改进的Zerilli-Armstrong模型对β钛合金在高应变率和高温下的流动行为进行本构模型

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摘要

The objectives of this work are to characterize the flow behaviour of the Ti-6Cr-5Mo-5V-4Al (Ti6554) alloy at high strain rates and elevated temperatures using the Johnson-Cook (JC) model and a modified Zerilli-Armstrong (ZA) model, and to make a comparative study on the predictability of these two models. The stress-strain data from Split Hopkinson Pressure Bar (SHPB) tests over a wide range of temperatures (293-1173 K) and strain rates (10~3-10~4 s~(-1)) were employed to fit parameters for the JC and the modified ZA models. It is observed that both the JC and the modified ZA models have good capacities of describing the flow behaviour of the Ti6554 alloy at high strain rates and elevated temperatures in terms of the average absolute error. The modified ZA model is able to capture the strain-hardening behaviour of the Ti6554 alloy better as it incorporates the coupling effects of strain and temperature. However, dynamic recovery or dynamic recrystallization that may happen at elevated temperatures should be taken into consideration when selecting data set for parameters fitting for the modified ZA model. Also the modified ZA model requires more stress-strain data for the parameters fitting than the JC model.
机译：这项工作的目的是使用Johnson-Cook（JC）模型和改进的Zerilli-Armstrong（ZA）模型表征高应变速率和高温下Ti-6Cr-5Mo-5V-4Al（Ti6554）合金的流动行为）模型，并对这两个模型的可预测性进行比较研究。使用分裂霍普金森压力棒（SHPB）测试的应力-应变数据在宽温度范围（293-1173 K）和应变速率（10〜3-10〜4 s〜（-1））中拟合参数JC和改良的ZA模型。可以看出，JC模型和改进的ZA模型都具有很好的能力来描述Ti6554合金在高应变速率和高温下的平均绝对误差方面的流动行为。修改后的ZA模型能够更好地捕捉Ti6554合金的应变硬化行为，因为它结合了应变和温度的耦合效应。但是，在选择适合修改后的ZA模型的参数数据集时，应考虑到高温下可能发生的动态恢复或动态重结晶。与JC模型相比，修改后的ZA模型还需要更多的应力-应变数据来拟合参数。

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  • 来源
    《Materials Science and Engineering》 |2014年第26期|71-79|共9页
  • 作者

    Hongyi Zhan; Gui Wang; Damon Kent; Matthew Dargusch;

  • 作者单位

    Centre for Advanced Materials Processing and Manufacture, School of Mechanical and Mining Engineering, The University of Queensland, St Lucia, Qld. 4072, Australia;

    Centre for Advanced Materials Processing and Manufacture, School of Mechanical and Mining Engineering, The University of Queensland, St Lucia, Qld. 4072, Australia,Defence Material Technology Centre, Level 2, 24 Wakefield St, Hawthorn, Vic. 3122, Australia;

    Centre for Advanced Materials Processing and Manufacture, School of Mechanical and Mining Engineering, The University of Queensland, St Lucia, Qld. 4072, Australia;

    Centre for Advanced Materials Processing and Manufacture, School of Mechanical and Mining Engineering, The University of Queensland, St Lucia, Qld. 4072, Australia,Defence Material Technology Centre, Level 2, 24 Wakefield St, Hawthorn, Vic. 3122, Australia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    β Titanium alloys; High strain rate deformation; Johnson-Cook model; Modified Zerilli-Armstrong model;

    机译：β钛合金;高应变率变形;Johnson-Cook模型;修正的Zerilli-Armstrong模型;

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