各向异性高强钢成形极限曲线有限元预测  

Finite element prediction of the forming limit curve for anisotropic high-strength steel

作　　者：桂良进[1] 张晓前 周驰[1] 范子杰[1] GUI Liangjin;ZHANG Xiaoqian;ZHOU Chi;FAN Zijie(State Key Laboratory of Automotive Safety and EnergyTsinghua University,Beijing 100084,China)

机构地区：[1]清华大学汽车安全与节能国家重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2019年第1期66-72,共7页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(51475255)

摘　　要：采用高强钢是实现汽车轻量化的有效途径之一,而成形极限曲线是用于判断金属板料成形效果的有效工具之一。为了降低实验成本、缩短开发周期,该文提出了一种考虑各向异性,以最大凸模力准则作为失稳判据,对高强钢Q490C的成形极限曲线进行仿真预测的方法。使用相应公式对仿真数据进行了拟合。仿真结果与试验数据得到的模型拟合曲线吻合得较好。将有限元预测得到的成形极限曲线的截距点与Keeler公式进行对比,二者一致性较好。该文采用的成形极限曲线的有限元预测方法可以较准确地预测各向异性板料的成形极限曲线,为板料冲压成形等后续工作奠定基础。High-strength steel is an effective way to reduce automobile masses,with the forming limit curve of the steel as an important tool for evaluating the sheet metal forming.A forming limit curve simulation prediction method for the anisotropic high-strength steel Q490 Cis given here based on the maximum punch force criterion to reduce experiment costs and shorten the development cycle.The results are then fit to correlations.The simulations agree well with experimental data.The simulated curve intercept agrees well with the Keeler’s formula.Thus,the finite element predictions of the forming limit curve used in this paper can accurately predict the forming limit curve for anisotropic sheets,which lays a foundation for blank stamping forming.

关 键 词：成形极限曲线 有限元预测 试验 Keeler公式 

分 类 号：TG386.3[金属学及工艺—金属压力加工]