局部减缩积分曲面展开单元在某汽车翼子板一步成形模拟中的应用

Modified Surface Spreading Four-node Element in One-step Inverse Forming Simulation and Its Application in Automobile Front Fender

为了进一步提高一步成形模拟的计算精度和避免单元的剪切闭锁,提出改进型曲面展开四节点等参膜单元模型,即在单元内力计算中采用了局部减缩积分技术,对现有算法进行了改进。将该方法用于某汽车翼子板成形模拟,并与增量法模拟结果及实验结果进行了对比。结果表明,改进后的一步成形模拟结果与增量模拟结果非常接近,而计算时间不到增量法的1/30,进而验证了本文方法的有效性和实用性。

To improve the precision of one-step forming simulation and avoid shearing closedown of unit, the currently used method was improved by proposing the model of surface spreading four-node isoparametric membrane element and adopting partial reducing integral technology. This method was applied to simulate an automobile front fender, and its results were compared with the results of experiment and simulation by incremental method. The contrast result shows that the results from one-step forming method are very close to those of incremental simulation but its computational time is fewer one thirtieth than that of incremental method, and proves the validity and practicability of the method proposed in this paper.