• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2016, Vol. 52 ›› Issue (4): 29-35.doi: 10.3901/JME.2016.04.029

• 材料科学与工程 • 上一篇    下一篇

高强钢板DP590温热环境下屈服准则适用性分析

程诚1, 刁可山2, 吴向东1, 王文平1, 万敏1, 蔡正阳1   

  1. 1. 北京航空航天大学机械工程及自动化学院 北京 100191;
    2. 宝钢集团汽车用钢开发与应用技术国家重点实验室 上海 201900
  • 出版日期:2016-02-15 发布日期:2016-02-15
  • 作者简介:程诚,男,1991年出生。主要研究方向为板料塑性成形理论与试验技术、板料成形数值模拟与优化。E-mail:cheng20090655@163.com;吴向东(通信作者),男,1970年出生,博士,副教授,硕士研究生导师。主要研究方向为板料成形性能及工艺分析、板料成形设备的研制与开发。E-mail:xdwu@buaa.edu.cn
  • 基金资助:
    国家自然科学基金(51275026)和宝钢重点实验室开放基金(Y12ECEQ07Y)资助项目

Applicability Analysis of Yield Criterion for Advanced High Strength Steels DP590 under Warm-forming Condition

CHENG Cheng1, DIAO Keshan2, WU Xiangdong1, WANG Wenping1, WAN Min1, CAI Zhengyang1   

  1. 1. School of Mechanical Engineering and Automation, Beihang University, Beijing 100191;
    2. State Key Laboratory of Development and Application Technology of Automotive Steels, Baosteel, Shanghai 201900
  • Online:2016-02-15 Published:2016-02-15

摘要: 板料成形过程中温度的变化会影响其塑性流动行为。以先进高强钢板DP590为研究对象,通过不同温度下单拉试验和不同温度不同加载比例双拉试验得到其在温热环境下的试验屈服轨迹,结果显示温度不仅会影响DP590钢板屈服轨迹的大小,而且影响屈服轨迹的形状。将试验屈服轨迹和几种理论屈服轨迹进行对比分析,表明Yld2000-2D屈服准则与试验结果吻合较好,同时等效应力应变点分析也显示出Yld2000-2D屈服准则满足塑性力学的单一曲线假设规律。针对Yld2000-2D屈服准则,采用不同温度下的试验数据计算出不同温度下的各向异性参数,通过拟合获得各向异性参数与温度的四次多项式函数关系,建立温度相关Yld2000-2D屈服准则,并与常规Yld2000-2D屈服准则对比分析,结果显示温度相关Yld2000-2D屈服准则更加适合描述DP590钢板温热环境下的屈服行为。

关键词: 等效应力应变, 屈服轨迹, 屈服准则, 温成形条件

Abstract: In order to investigate the temperature effect on the yield behavior of the DP590 under warm forming condition, the yield loci are obtained by conducting biaxial and uniaxial tensile tests under different directions. The comparison of homogenized stresses of different tensile directions shows DP590 sheet obeys isotropic hardening law approximately and the shape and size of the yield loci are influenced by the temperature evidently. The yield criterion of Yld2000-2D proves to be a better choice for the accurate description of yield behavior under the warm-forming condition by comparing between the experimental and theoretical yield loci. Based on the equivalent stress and strain associated with the given yield criteria under different proportional loading paths, the applicability of Yld2000-2D yield criterion is verified. Furthermore, four polynomial function of temperature are used to fit the variation trend of the anisotropic parameters in Yld2000-2d yield function under different temperatures. The temperature-dependent yield criterion is then established by calibrating the dependence of the anisotropic criterion and the temperature. Compared with other commonly used yield criteria, the proposed temperature-dependent yield criterion is more accurate under warm-forming condition.

Key words: equivalent stress and strain, warm-forming condition, yield criteria, yield loci

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