5052铝板拉伸翻边工艺中的裂纹位置和扩展预测的有限元模拟（英文）

发布时间：2018-09-13 14:21

【摘要】：拉伸翻边工艺受多种几何形状、材料和工艺参数的影响。冲模间隙和初始翻边长度是影响边界裂纹位置和沿模侧面半径应力分布的主要参数。采用数值模拟研究AA-5052铝板的非轴对称拉伸翻边工艺,预测翻边的变形行为、裂纹位置和扩展,并且研究拉伸翻边过程中冲模间隙、翻边长度、冲模外形半径和摩擦力的影响。利用实验研究对模拟结果进行验证。结果表明,裂纹长度随翻边长度的增加而增加,翻边长度在周向的影响比在轴向的影响大,冲模间隙比翻边长度对裂纹扩展的影响更大。当冲孔外形半径比模的外形半径小时,周向应变增加,这导致了较快的边裂纹扩展。在边裂纹位置和变形负载方面,模拟结果和实验结果较好吻合。
[Abstract]:The drawing flanging process is affected by various geometric shapes, materials and process parameters. The blanking clearance and the initial flanging length are the main parameters affecting the location of the boundary crack and the stress distribution along the side radius of the die. The non-axisymmetric drawing flanging process of AA-5052 aluminum plate was studied by numerical simulation. The deformation behavior, crack location and propagation of flanging were predicted, and the effects of die clearance, flanging length, die shape radius and friction force during drawing flanging were studied. The simulation results are verified by experimental research. The results show that the crack length increases with the increase of flanging length, the influence of flanging length is greater in circumferential direction than in axial direction, and the influence of die clearance on crack propagation is greater than flanging length. When the shape radius of punching hole is smaller than that of die, the circumferential strain increases, which leads to faster edge crack growth. The simulation results are in good agreement with the experimental results in terms of edge crack location and deformation load.
【作者单位】： Department
【基金】：the Science and Engineering Research Board(SERB) Department of Science & Technology,Government of India for financially supporting this research
【分类号】：TG306

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