高强钢板DP590温热环境下屈服准则适用性分析

发布时间：2018-04-01 17:02

  本文选题：温成形条件　切入点：屈服轨迹　出处：《机械工程学报》2016年04期

【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。
[Abstract]:The change of temperature during sheet metal forming will affect the plastic flow behavior of sheet metal. The advanced high strength steel plate DP590 is taken as the research object. The yield trajectory of the DP590 steel plate is obtained by the order drawing test at different temperature and the double tensile test at different temperature and different loading ratio. The results show that the temperature will not only affect the yield trajectory of DP590 steel plate. And the shape of the yield trajectory is affected. The comparison between the experimental yield trajectory and several theoretical yield trajectories shows that the Yld2000-2D yield criterion is in good agreement with the experimental results. At the same time, the equivalent stress-strain point analysis also shows that the Yld2000-2D yield criterion satisfies the assumption of a single curve of plastic mechanics. According to the Yld2000-2D yield criterion, the anisotropic parameters at different temperatures are calculated by using the experimental data at different temperatures. By fitting the fourth-order polynomial function between anisotropic parameters and temperature, the temperature-dependent Yld2000-2D yield criterion is established and compared with the conventional Yld2000-2D yield criterion. The results show that the temperature-dependent Yld2000-2D yield criterion is more suitable to describe the yield behavior of DP590 steel under warm and thermal conditions.
【作者单位】： 北京航空航天大学机械工程及自动化学院;宝钢集团汽车用钢开发与应用技术国家重点实验室;
【基金】：国家自然科学基金(51275026) 宝钢重点实验室开放基金(Y12ECEQ07Y)资助项目
【分类号】：O344.1
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本文编号：1696452