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金属板壳件的多加强肋需一次成形,而现有单加强肋胀形可行性条件不能直接用来判断多加强肋能否一次成功胀形。将多加强肋间区域视为反向加强肋,在其许用变形程度比正向加强肋小的前提下,提出了多加强肋胀形可行性的补充条件。建立了单加强肋、近距分布及远距分布多加强肋的3种板壳件模型,运用ANSYS/LS-DYNA完成了其胀形成形的有限元数值模拟。厚度减薄率和成形极限图的模拟结果验证了多加强肋胀形可行性补充条件的有效性。多加强肋之间的距离是决定其能否一次胀形成形的关键因素。
The multi-stiffener of the metal plate shell needs to be formed once. However, the existing single stiffened rib bulge-forming feasibility conditions can not be directly used to determine whether the multi-stiffener can be successfully bulged once. Considering the inter-stiffened inter-stiffened region as the reverse stiffener, the feasibility of the multi-stiffener rib bulging is put forward on the premise that the allowable deformation is smaller than the positive stiffener. Three kinds of shell and shell models with single stiffener, close-spaced and long-distance distributed stiffeners were established. Finite element numerical simulation of bulging forming was completed by ANSYS / LS-DYNA. The simulation results of the thickness reduction rate and the forming limit map validate the feasibility of the supplementary conditions for multi-stiffened rib bulging. Reinforcing the distance between the ribs is the key factor in determining whether it can once bulge form.