先進高強度鋼板沖壓成形包辛格效應之研究

洪英治

doi:10.6342/NTU.2011.00651

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先进高强度钢板冲压成形包辛格效应之研究

A Study of Bauschinger Effect in Stamping of Advanced High Strength Steel Sheets

洪英治 , 硕士　　导师：陈复国　　

繁体中文 DOI： 10.6342/NTU.2011.00651

包辛格效应；先进高强度钢板；冲压成形；回弹；动态硬化准则；包辛格效应试验；有限元素法分析； Bauschinger effect ； advanced high strength steel ； stamping ； springback ； kinematic hardening rule ； experiment ； finite element analysis

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摘要 │ 参考文献 (55) │ 被引用文献 (1) │ 国际计量

摘要〈TOP〉

并列摘要〈TOP〉

The advanced high strength steel has been widely applied to the car body structural components. However, the high flow stress makes the sheet metal forming process even more difficult. In addition to the defects of fracture and wrinkling, which are commonly present in the stamping of conventional steel sheet, the occurrence of springback, side-wall curl and distortion is the main issue to be solved. In order to cope with this dilemma, the finite element analysis was employed to help the tooling design aiming to eliminate the springback in the sheet forming process. The efforts were endeavored to establish the optimum simulation parameters, such as element size, number of integration point, and punch velocity. However, the accuracy in the prediction of springback is yet to be improved even with the optimum simulation parameters adopted. Hence, the material model including the yield criteria and the work hardening rules has been considered as the other possible reasons that may cause the inaccuracy of the finite element simulations in the sheet forming of advanced high strength steel. 
In the present study, the Bauschinger effect that induces anisotropic work hardening properties was examined by both the experimental approach and the finite element analysis. The tension-compression tests were first conducted for the specimens made of conventional 270 and DP590Y steel sheets with the special experimental apparatus designed by Heng-Kuang Tsai in our lab. The Bauschinger effect was clearly observed in the test results of DP590Y steel sheets rather than those of 270 steel sheets. The test results were then used in the finite element simulations as part of the material properties characterizing the kinematic hardening behavior of the sheet metal. Both the Hill 48 yield criterion with isotropic hardening rule and Yoshida-Uemori model (Y-U model) were adopted to simulate the V-bend, U-bend, and U-hat bend of DP590Y steel sheets. The simulation results were compared with the experimental data obtained from the tests conducted in our lab. It is found that the simulation results with the Bauschinger effect considered are more consistent with the experimental data either in springback or in side wall curl than those of simulations using an isotropic hardening rule. The springback occurs in the stamping of an automotive structural part made of DP590Y steel sheets were also examined in the present study by both the finite element analysis and the actual production process. It is noted that the deformation mechanism of these automotive parts is significantly affected by the Bauschinger phenomenon as the advanced high strength steel is adopted. The comparison of the finite element simulation results and the actual production parts also reveals that the simulation results with the use of the Yoshida-Uemori model renders to a more accurate prediction in springback in the stamping of the DP590Y steel sheets. It thus concludes that the Bauschinger effect plays an important role in the stamping of advanced high strength steel sheets and the employment of the kinematic hardening rule in the finite element simulations is necessary.

参考文献 ( 55 ) 〈TOP〉

[1] A. Forcellese, “Computer aided engineering of the sheet bending process”, Journal of Materials Processing Technology, 60, pp. 225-232, 1996.
连结：
[2] K. Mori, K. Akita, and Y. Abe, “Springback behavior in bending of ultra-high-strength steel sheets using CNC servo press”, International Journal of Machine Tools & Manufacture, Vol. 47, pp. 321-325, 2007.
连结：
[4] 苏昱竹, “先进高强度钢板冲压成形回弹现象之研究”, 国立台湾大学机械工程研究所硕士论文, 2007.
连结：
[5] M. Samuel, “Experimental and numerical prediction of springback and side wall curl in U-bendings of anisotropic sheet metals”, Journal of Materials Processing Technology, 105, pp. 382-393, 2000.
连结：
[6] M. Lee, D. Kim, C. Kim, M. L. Wenner, and K. Chung, ”Springback evaluation of automotive sheets based on isotropic–kinematic hardening laws and non-quadratic anisotropic yield functions, part III: applications”, International Journal of Plasticity, 21, pp. 915-953, 2005.
连结：

被引用文献 (1) 〈TOP〉

许钧凯(2017)。以基础载具分析先进高强度钢板扭曲现象之研究。国立台湾大学机械工程学系学位论文。2017。1-97。

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