Numerical and Experimental Investigations on Springback of U-bending of DP600 Steel Alloy Sheet

Document Type: Persian

Authors

1 Ph.D. Student, Department of Mechanic, Birjand University, Birjand, Iran.

2 Assistant Professor, Department of Mechanic, Central Tehran branch, Islamic Azad University, Tehran, Iran.

3 Assistant Professor, Department of Mechanic, Birjand University, Birjand, Iran.

Abstract

The most prominent feature of sheet material forming process is an elastic recovery phenomenon during unloading which leads to springback and side wall curl. Therefore evaluation of springback and side wall curl is mandatory for production of precise products. In this paper, the effects of some parameters such as friction coefficient, sheet thickness, yield strength of sheet and blank-holder force on the springback and side wall curl in U-bending of DP600 steel alloy sheet has been investigated. The investigations have been done by computer simulation. In the simulations the ABAQUS finite element software has been used and the results compared to experimental ones. The finite element results have been validated from experimental results. After validation of FEM simulation via experimental results a powerful, rapid and efficient tool was introduced for investigating some important aspects and parameters of U-bending process such as blank-holder force, sheet thickness, yield strength of sheet and friction coefficient. MINITAB, a statistical software, was used to analyze finite element results. With the use of MINITAB, equations for prediction of springback and side wall curl radius by friction coefficient, sheet thickness, yield strength and blank-holder force were obtained.

Keywords


[1] Gardiner F.J., The springback of metals, Trans. ASME, 79, 1957, pp. 1-9.

[2] Johnson W., and Yu T.X., Influence of axial force on the elastic-plastic bending and springback of a beam, Journal of Mechanical Working Technology, 6, 1982, pp. 5-21.

[3] Johnson W., Yu T.X., On springback after the pure bending of beams and plates of elastic work hardening material, International Journal of Mechanical Sciences, 23, 1981, pp. 687-696.

[4] Chongthairungruang B., Uthaisangsuk V., Suranuntchai S., Jirathearant S., Experimental and numerical investigation of springback effect for advanced high strength dual phase  steel, Journal of Materials and Design, 39, 2012, pp. 318-328.

[5] Zhou D., Siriam S., Jinka A., and Wagoner R.H., Bending and springback using membrane elements, Engineering Systems Design and Analysis, 75, 1996, pp. 135-142.

[6] Siriam S., Wagoner R.H., Adding bending stiffness to 3-D membrane FEM programs, International Journal of Mechanical Sciences, 42, 2000, pp. 1753-1782.

[7] Pourboghrat F., Karabin M., Becker R.,  Chung K., A hybrid membrane/shell method for calculating springback of anisotropic sheet metals undergoing axisymmetric loading, International journal of Plasticity, 16, 2000, pp. 77-700.

 [8] Pourboghrat F., and Chu E., Springback in plane strain stretch/draw sheet forming, International Journal of Mechanical Sciences, 36, 1995, pp. 327-341.

 [9] Pourboghrat F., Chu E., Prediction of springback and side wall curl in 2-D draw bending, Journal of Materials Processing Technology, 50, 1995, pp. 361-374.

[10] Li G.Y., Tan M.J., Liew K.M., Springback analysis for sheet forming processes by explicit finite element method in conjunction with the orthogonal regression analysis, International Journal of Solid Structure, 36, 1999, pp. 4653-4668.

[11] Samuel M., Experimental and numerical prediction of springback and side wall curl in U-bending of anisotropic sheet metals, Journal of Materials Processing Technology, 105, 2000, pp. 382-393.

[12] Liu G., Lin Z., Xu W., Bao Y., Variable blank holder force in U-shaped part forming for eliminating springback error, Journal of Materials Processing Technology, 120, 2002, pp. 259-264.

[13] Liu G., Lin Z., and Bao Y., Improving dimensional accuracy of a U-shaped part through an orthogonal design experiment, Finite Element Analysis, 39, 2005, pp.116-127.

[14] Ragai I., Lazim D., and Nemes A., Anisotropy and springback in draw-bending of stainless steel 410: experimental and numerical study, Journal of Materials Processing Technology, 166, 2005, pp. 116-127.

[15] Mohammadi S.V., Parsa M.H., and Jalali Aghchai A., Effect of the thickness distribution and setting condition on springback in multi-layer sheet bending, International Journal of Engineering, 3, 2011, pp. 225-235.

 

[16] Yang D.S., Liu W., Hu G.j., Zhou J., and Su Z., Study on hot forming process and  springback of ultra-high strength steel Based on ABAQUS, Journal of Advanced Materials Research, 484, 2012, pp. 2430-2437.

[17] Barouzeh M.R., and Mondali M., Springback investigation warm V-bending conditions by numerical and experimental methods, International Conference on Trends in Mechanical and Industrial Engineering, Bangkok, December, 2011, pp. 185-190.

[18] Huang J., Microstructure evolution during processing of dual phase and TRIP steels, University of British Columbia, 2004.

[19] Kim H.S., and Koc M., Numerical investigations on springback characteristics of aluminum sheet metal alloys in warm forming conditions, Journal of Materials Processing Technology, 204, 2008, pp. 370-383.