Numerical Simulation of Mechanical Bulging Process of a Large Three-Layer Rectangular Bellow
摘要
A novel mechanical bulging process is proposed in this work to overcome the disadvantages of the existing forming process for large rectangular bellows with deep waves. Numerical simulation was conducted on the mechanical bulging process of the three-layer 304 stainless steel rectangular bellow. Simulation results revealed that each layer steel had similar deformation and equivalent strain distribution. The maximum equivalent strain at the round corner of the rectangular bellow was 0.406. The general dimensions of the rectangular bellow were well consistent with the designed values. The wall thickness thinning rate at the round corner was greater than that in the straight edges, which had a maximum value of 20.48%.