论文部分内容阅读
针对金属板料成形过程中的损伤破裂问题,基于Gurson-Tvergaard-Needleman(GTN)细观损伤本构模型建立了相应的损伤力学有限元数值计算方法,将完全隐式应力更新算法与显式有限元计算相结合,并考虑了板料的塑性各向异性行为,通过用户自定义材料子程序VUMAT将损伤模型嵌入到有限元软件ABAQUS中。对AA5052-O铝合金板材圆杯拉深成形损伤破坏过程进行了数值模拟计算。分析了采用不同板坯大小时零件的破裂情况,并与实验进行了对比。结果表明:GTN损伤模型可以有效揭示金属板材的复杂损伤行为并预测破裂缺陷;随着板坯直径的增大,零件的破裂趋势也增大。
Aiming at the problem of damage and rupture during the forming process of sheet metal, a corresponding damage mechanics finite element numerical calculation method is established based on the Gurson-Tvergaard-Needleman (GTN) meso-damage constitutive model. The explicit implicit stress update algorithm Element calculation and considering the plastic anisotropy of sheet metal, the damage model is embedded into the finite element software ABAQUS through the user-defined material subroutine VUMAT. The numerical simulation of the damage process of AA5052-O aluminum alloy round cup deep drawing was carried out. The fracture of parts with different slab sizes was analyzed and compared with the experiment. The results show that the GTN damage model can effectively reveal the complex damage behavior of the sheet metal and predict the rupture defect. With the increase of the slab diameter, the fracture tendency of the part also increases.