Abstract: Taking the truck door assembly as the research object, the formability, modality and anti-concavity of the truck door assembly after using the lightweight scheme of dual-phase steel and laser welding were studied through the simulation analysis of the finite element software Autoform and HyperWorks. The results show that the body of the parts for outer plate of DP450 dual-phase steel and the inner plate of the laser welding are well formed. The first-order torsion frequency of the door is 27.95 Hz and the first-order bending frequency is 41.44 Hz. The main excitation frequency is avoided well in each mode. The maximum deformation of the anti-concavity is 3.83 mm, which meets the requirement of truck door design less than 7 mm. It is feasible to use DP450*0.7 mm dual-phase steel as the plate material of truck door and 0.8 mm, 1.0 mm inner plate of laser welding. This scheme can achieve a weight reduction of about 5kg and a weight reduction ratio of about 20.5%, which can be used as an alternative material selection scheme for future models.

Key words: Truck door; Dual-phase steel; Laser welding; Finite element analysis; Lightweight application; Autoform and HyperWorks

摘要： 以卡车车门小总成为研究对象，通过 Autoform 和 HyperWorks 有限元软件仿真分析， 研究了应用双相钢和激光拼焊工艺的轻量化方案后车门小总成的成形性能、模态和抗凹性问 题。结果显示，DP450 双相钢外板和激光拼焊工艺内板零件本体成形良好，车门一阶扭转频 率为 27.95 Hz、一阶弯曲频率为 41.44 Hz，各阶模态较好避免主激励频率，抗凹性能最大变 形量为 3.83 mm，满足卡车车门设计小于 7 mm 要求。因此，采用 DP450*0.7 mm 双相钢作为 车门外板和 0.8 mm、1.0 mm 激光拼焊内板材料具备可行性，该方案可实现车门减重约 5 kg， 减重比约 20.5%，可作为未来车型选材备选方案。

关键词: 卡车车门；双相钢；激光拼焊；有限元分析；轻量化应用；Autoform 和 HyperWorks