Influence of boundary conditions on the prediction of springback and wrinkling in sheet metal forming

被引:39
作者
Neto, D. M. [1 ]
Oliveira, M. C. [1 ]
Santos, A. D. [2 ]
Alves, J. L. [3 ]
Menezes, L. F. [1 ]
机构
[1] Univ Coimbra, Dept Mech Engn, CEMUC, Polo 2,Rua Luis Reis Santos, P-3030788 Coimbra, Portugal
[2] Univ Porto, Fac Engn, INEGI FEUP, Rua Dr Roberto Frias, P-4200465 Oporto, Portugal
[3] Univ Minho, Microelectromech Syst Res Unit, CMEMS, Campus Azurem, P-4800058 Guimaraes, Portugal
关键词
Sheet metal forming; Wrinkling; Finite element analysis; Boundary conditions; DD3IMP; DEEP-DRAWING PROCESS; NUMERICAL-SIMULATION; FRICTIONAL CONTACT; VALIDATION; SURFACES; BEHAVIOR; DESIGN;
D O I
10.1016/j.ijmecsci.2017.01.037
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The high-strength steel sheets currently used in the automotive industry are prone to non-traditional behaviour during forming, being wrinkling and springback two of the most challenging geometrical predictions for numerical simulation. Thus, the finite element method requires accurate and reliable numerical models. This study presents the experimental and numerical analysis of a rail component with high tendency to develop wrinlding and 2D springback. Two different materials are used for the sheet blank, namely a mild steel (DC06) and a dual phase steel (DP600). The frictional behaviour between each metallic sheet and the forming tools is evaluated through the flat-die test, allowing the determination of a friction coefficient as a function of the normal pressure. The influence of the applied boundary conditions on the numerical results is evaluated by means of two distinct numerical models (full blank geometry and 1/4 of the blank with symmetry conditions). The results show that the wrinkling behaviour is strongly affected by the blanks material, as well as by the symmetry conditions defined in the numerical model. In fact, considering the full model of the blank, the numerical results are in better agreement with the experimental ones. However, the computational cost of the numerical simulation considering the full blank is substantially higher than using 1/4 of the blank.
引用
收藏
页码:244 / 254
页数:11
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