为研究带有反向压力粘性介质压力胀形过程中接触条件对板材成形性的影响规律,利用DEFORM~(TM)-2D结合韧性断裂准则对覆层板粘性介质压力胀形过程进行有限元分析.结果表明:接触表面无摩擦单纯依靠反向压力能够提高板材成形极限,随着接触表面摩擦系数增大,板材壁厚分布愈均匀,板材的破裂位置由试件顶端转移到凹模圆角处,板材成形极限显著提高.因此,在三维应力状态下有效控制板材所受法向压力和界面摩擦力可以提高板材成形性.
To investigate the effect of normal pressure and contact friction on the formability of sheet metal,the viscous pressure bulging tests of overlapping sheet metals were presented and then simulated by the finite element code DEFORM-2D combined with the ductile fracture criterion.The results show that the forming limit of the sheet metal can be improved by normal pressure simply;the distribution of thickness turns to be more unifom with the interface friction coefficient increased.and the fracture locus transits from the dome top to the die corner.The formability of sheet metal can be improved significantly by controlling the normal pressure and interface friction.
参考文献
| [1] | Smith LM.;Averill RC.;Lucas JP.;Stoughton TB.;Matin PH. .Influence of transverse normal stress on sheet metal formability[J].International Journal of Plasticity,2003(10):1567-1583. |
| [2] | Matin PH;Smith LM .Practical limitations to the influence of through-thickness normal stress on sheet metal formability[J].International Journal of Plasticity,2005(4):671-690. |
| [3] | Masanori Kobayashi;Nobukazu Hayashi;Yasushi Kurosaki .Improvement of pure stretchability by overlapping sheet metals[J].塑性と加工,2001(483):328-332. |
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