均匀网格壁板三点弯曲过程的有限元分析与试验研究

Finite element analysis and experimental research of three-point bending process for uniform mesh panels

利用有限元分析（FEA）软件ABAQUS模拟了2219铝合金材料均匀网格壁板三点弯曲过程,分析了材料在不同压弯方案中所受的应力以及弯曲后对材料最终变形的影响。分析结果表明压弯过程中凸模与网格壁板的接触形式将影响壁板最终型面,同时通过增大网格根部R角能够有效地降低壁板弯曲过程中所受的集中应力。最后,进行了均匀网格壁板的三点弯曲试验,弯曲试验后检查壁板弧度及网络根部,检查结果发现弯曲后的壁板发生了回弹,且凸模与网格面接触方式下弯曲后壁板回弹量较大;小根部R角的网络壁板根部因应力过大出现裂纹,试验结果与仿真模拟的弯曲规律保持一致。

The three-point bending process for aluminium alloy 2219 uniform mesh panels was simulated by using the finite element analysis（ FEA） software ABAQUS,the stress distribution in different bending plans and the final deformation after bending process were analyzed. The results show that during the bending process,the contact form between the punch and the mesh panel can affect the final deformation of the panel,meanwhile,the concentrated stress of the mesh panel can be reduced effectively during the bending process by increasing the root angle R of the panels. Finally,the three-point bending experiments of the uniform mesh panels were carried out. The curvature and the mesh root of the panels were checked after bending experiments. The springback of the plates after the bending process is found,and the springback value between the punch and the mesh surface is larger than that of the other situation. At the same time,the crack caused by the excessive stress is found in the root of mesh panels with smaller root angle R. The experimental results keep consistent with the simulation results.