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。
程诚
,
刁可山
,
吴向东
,
王文平
,
万敏
,
蔡正阳
. 高强钢板DP590温热环境下屈服准则适用性分析[J]. 机械工程学报, 2016
, 52(4)
: 29
-35
.
DOI: 10.3901/JME.2016.04.029
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.
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