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基于有限元增量理论和BWC壳单元,提出一种新的快速模拟橡皮囊液压成形的算法。该算法可简化橡皮囊层与板料接触模型,能够对橡皮囊层所施加作用的板料区域进行自动判断,并对该区域进行液压加载;根据橡皮囊的容积,可自动调整囊内的液压强度,将液压力均匀地分配在零件的节点上;同时,采用该算法对橡皮囊层与板料的摩擦模型进行处理。以一直弯边零件为研究对象,选择铝合金材料AA2024-O进行橡皮囊液压成形模拟,其模拟结果与相关文献中的数据进行比较证明,该文算法对橡皮囊液压零件成形具有良好的精度。
Based on the finite element incremental theory and the BWC shell element, a new algorithm for rapid simulation of rubber balloon hydraulics was proposed. The algorithm can simplify the contact model between rubber bladder and sheet, and can automatically judge the area of the sheet that the rubber layer exerts and hydraulically load the area. According to the volume of the rubber bladder, the hydraulic pressure in the bladder can be automatically adjusted Strength, the hydraulic pressure is evenly distributed on the nodes of the part. At the same time, the algorithm is used to deal with the friction model of the rubber bladder layer and the sheet metal. The bending part was taken as the research object. The aluminum alloy material AA2024-O was chosen to simulate the hydraulic forming of the rubber bladder. The simulation results were compared with the data in the relevant literature to prove that the proposed method has good accuracy for forming the rubber parts.