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首页> 外文期刊>High temperature materials and processes >A Modified Constitutive Model for Tensile Flow Behaviors of BR1500HS Ultra-High-Strength Steel at Medium and Low Temperature Regions
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A Modified Constitutive Model for Tensile Flow Behaviors of BR1500HS Ultra-High-Strength Steel at Medium and Low Temperature Regions

机译：BR1500HS超高强度钢在中低温区的拉伸流动行为的修正本构模型

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摘要

Constitutive model of materials is one of the most requisite mathematical model in the finite element analysis, which describes the relationships of flow behaviors with strain, strain rate and temperature. In order to construct such constitutive relationships of ultra-high-strength BR1500HS steel at medium and low temperature regions, the true stress-strain data over a wide temperature range of 293-873 K and strain rate range of 0.01-10 s~(-1) were collected from a series of isothermal uniaxial tensile tests. The experimental results show that stress-strain relationships are highly non-linear and susceptible to three parameters involving temperature, strain and strain rate. By considering the impacts of strain rate and temperature on strain hardening, a modified constitutive model based on Johnson-Cook model was proposed to characterize flow behaviors in medium and low temperature ranges. The predictability of the improved model was also evaluated by the relative error (W(%)), correlation coefficient (R) and average absolute relative error (AARE). The R-value and AARE-value for modified constitutive model at medium and low temperature regions are 0.9915 & 1.56% and 0.9570 & 5.39%, respectively, which indicates that the modified constitutive model can precisely estimate the flow behaviors for BR1500HS steel in the medium and low temperature regions.
机译：材料的本构模型是有限元分析中最必要的数学模型之一，它描述了流动行为与应变，应变率和温度之间的关系。为了构造中高低温区域的超高强度BR1500HS钢的本构关系，在293-873 K的宽温度范围内和0.01-10 s〜（-）的应变率范围内的真实应力-应变数据。 1）从一系列等温单轴拉伸试验中收集。实验结果表明，应力-应变关系是高度非线性的，并且容易受到涉及温度，应变和应变率的三个参数的影响。考虑到应变速率和温度对应变硬化的影响，提出了一种基于Johnson-Cook模型的修正本构模型，以表征中低温范围内的流动行为。还通过相对误差（W（％）），相关系数（R）和平均绝对相对误差（AARE）评估了改进模型的可预测性。修改后的本构模型在中低温区域的R值和AARE值分别为0.9915和1.56％和0.9570和5.39％，这表明修改后的本构模型可以准确地估计BR1500HS钢在介质中的流动行为和低温地区。

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  • 来源
    《High temperature materials and processes》 |2018年第1期|39-57|共19页
  • 作者

    Jun Zhao; Guo-Zheng Quan; Jia Pan; Xuan Wang; Dong-Sen Wu; Yu-Feng Xia;

  • 作者单位

    School of Material Science and Engineering, Xiamen University of Technology, Xiamen 361024,China;

    State Key Laboratory of Mechanical Transmission,School of Material Science and Engineering, Chongqing University,Chongqing 400044, China;

    State Key Laboratory of Mechanical Transmission, School of Material Science and Engineering, Chongqing University, Chongqing 400044, China;

    State Key Laboratory of Mechanical Transmission, School of Material Science and Engineering, Chongqing University, Chongqing 400044, China;

    State Key Laboratory of Mechanical Transmission, School of Material Science and Engineering, Chongqing University, Chongqing 400044, China;

    State Key Laboratory of Mechanical Transmission, School of Material Science and Engineering, Chongqing University, Chongqing 400044, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ultra-high-strength steel; hot stamping; constitutive model; Johnson-cook model;

    机译：超高强度钢;烫金;本构模型约翰逊库克模型;

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