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首页> 外文期刊>塑性と加工 >Effects of Incremental Values on the Computation Accuracy of Springback in Static Explicit FEM Analysis of Stretch-Bending Process
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Effects of Incremental Values on the Computation Accuracy of Springback in Static Explicit FEM Analysis of Stretch-Bending Process

机译：拉伸弯曲过程静态显式有限元分析中增量值对回弹计算精度的影响

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摘要

The magnitude of springback of a sheet metal subjected to a stretch-bending process using a cylindrical die is predicted with static explicit FEM and is compared with experimental results. The effects of incremental values on the computation accuracy of springback are examined. The results obtained in this study are as follows. 1) In order to accurately predict the magnitude of springback, it is crucial to reduce the imbalance of moment #DELTA#M, which is retained at the end of the bending process, to as small a value as possible. #DELTA#M can be reduced by decreasing the computation error of the elongation #delta#L of the sheet strip obtained in the initial stretching process. 2) In order to reduce the computation error of #delta#L, it is suggested that the incremental values used in the initial stretching process, i.e., the increment of equivalent stress #DELTA##sigma#-bar in the elastic region and the increment of equivalent plastic strain #DELTA##epsilon#-bar~p, should be as small as possible. 3) In the present analysis, the optimum incremental values that give accurate springback prediction are as follows:#DELTA##epsilon#-bar~p =0.0002 and #DELTA##sigma#-bar/#sigma#_y =0.1 (#sigma#_y: yield stress) in the initial stretching process; #DELTA##epsilon#-bar~p =0.002 and the increment of rotating angle #DELTA##omega# is 0.2 deg in the bending process; #DELTA##epsilon#-bar~p = 0.002 and #DELTA##omega# = 0.01 in the unloading process.
机译：使用静态显式有限元法预测了使用圆柱形模具进行拉伸弯曲过程的金属板的回弹量，并将其与实验结果进行了比较。研究了增量值对回弹计算精度的影响。在这项研究中获得的结果如下。 1）为了准确地预测回弹的幅度，至关重要的是将弯折过程结束时保持的力矩＃DELTA＃M的不平衡度减小到尽可能小的值。通过减小在初始拉伸过程中获得的片材的伸长率＃delta＃L的计算误差，可以减小＃DELTA＃M。 2）为了减少＃delta＃L的计算误差，建议在初始拉伸过程中使用增量值，即弹性区域中等效应力＃DELTA ## sigma＃-bar的增量。当量塑性应变＃DELTA ## epsilon＃-bar〜p的增量应尽可能小。 3）在本分析中，给出准确回弹预测的最佳增量值如下：＃DELTA ## epsilon＃-bar〜p = 0.0002和＃DELTA ## sigma＃-bar /＃sigma＃_y = 0.1（＃ sigma＃_y：屈服应力）在初始拉伸过程中;在弯曲过程中，＃DELTA＃epsilon＃-bar〜p ＝ 0.002，并且旋转角度＃DELTA ## omega＃的增量为0.2度。在卸载过程中，＃DELTA＃epsilon＃-bar〜p = 0.002和＃DELTA ## omega＃= 0.01。

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