ABSTRACT

In this study, a combined numerical and experimental study on the hole-blanking test (HBT) and hole-expansion test (HET) of ferrite bainite steel (FB590) sheets was conducted. Three-dimensional (3D) finite element (FE) models of HBT and HET were created based on a CrachFEM fracture model, which combines the ductile and the shear fracture criterion. The HBT with various punch/die clearances were simulated using ABAQUS commercial software. Then, the simulation results of the HBT were transferred to the HET environment for the dynamic simulation of HET until the fracture occurs. The effects of punch/die clearance on the hole-edge conditions after blanking and the hole-expansion ratio (HER) with a burr up and down orientations of blanking were investigated. Experiments of HBT and HET were carried out to verify the FE models. The simulation results showed that the punch/die clearance and burr orientation significantly influence the shear/fracture zone, hole edge parameters, and HER of ferrite bainite steel (FB590) sheets.

摘要

在这项研究中，对铁素体贝氏体钢 (FB590) 板的冲孔试验 (HBT) 和扩孔试验 (HET) 进行了数值和实验相结合的研究。HBT 和 HET 的三维 (3D) 有限元 (FE) 模型是基于 CrachFEM 断裂模型创建的，该模型结合了延展性和剪切断裂准则。使用 ABAQUS 商业软件模拟具有各种冲头/模具间隙的 HBT。然后，将 HBT 的模拟结果转移到 HET 环境中进行 HET 的动态模拟，直到发生断裂。研究了冲头/模具间隙对冲裁后孔边缘条件和冲裁毛刺上下方向的扩孔率 (HER) 的影响。进行了 HBT 和 HET 实验以验证有限元模型。