2Iranian National Center for Laser Science and Technology (INLC), PO Box: 14665-576, Tehran, Iran
Formability of Tailor Welded Blank (TWB) is an important parameter which limits this kind of blanks usage. A forming criterion for tailor welded blank is presented based on the analytical model in this research. This criterion suggests Limit Strength Ratio (LSR) and Limit Thickness Ratio (LTR) for forming limit of TWB. When thickness ratio or strength ratio in tailor welded blank is greater than LTR or LSR, formability will be limited and necking will happen sooner. The influence of thickness ratio on the formability of TWB has been investigated by experimental tests and Finite Element (FE) simulations, but strength ratio has just been studied by simulation. All the simulation and experiment results indicate that by the increase of thickness ratio and strength ratio, the formability will decrease and weld line movement will increase. The obtained results of the present study indicate that fracture happens in the thinner side of TWB and near to the weld line. Moreover, fracture line is parallel to weld line and the fracture position moves farther than weld line by thickness ratio decreasing. Simulation results have a good agreement with experimental results as well.
 P. Auto/Steel Partnership. Tailor welded blank design and manufacturing manual. Auto/Steel Partnership, [S.l.], (1995).
 M. Eisenmenger, K.K. Bhatt and M.F. Shi. Influence of laser welding parameters on formability and robustness of blank manufacturing : an application to a body side frame. Society of Automotive Engineers, New York, NY, ETATS-UNIS, (1995).
 M.A. Ahmetoglu, D. Brouwers, L. Shulkin, L. Taupin, G.L. Kinzel and T. Altan. Deep drawing of round cups from tailor-welded blanks. Journal of Materials Processing Technology. 53 (1995) 684-94.
 F. Cayssials, An industrial application of specific forming limit curves for tailor welded blanks. Proceedings of the 2000 International Deep Drawing Research Group, North American Deep Drawing Research Group, (2000) 17–22.
 B. Kinsey, Z. Liu and J. Cao. A novel forming technology for tailor-welded blanks. Journal of Materials Processing Technology. 99 (2000) 145-53.
 B.L. Kinsey and J. Cao. An analytical model for tailor welded blank forming. Journal of Manufacturing Science and Engineering. 125 (2003) 344-51.
 S. He, X. Wu and S.J. Hu. Formability enhancement for Tailor-welded blanks using blank holding force control. Journal of Manufacturing Science and Engineering. 125 (2003) 461-7.
 R. Safdarian Korouyeh, H. Moslemi Naeini and G. Liaghat. Forming limit diagram prediction of tailor-welded blank using experimental and numerical methods. Journal of Materi Eng and Perform. 21 (2012) 2053-61.
 R. Safdarian Korouyeh, H. Moslemi Naeini, M.J. Torkamany and G. Liaghat. Experimental and theoretical investigation of thickness ratio effect on the formability of tailor welded blank. Optics & Laser Technology. 51 (2013) 24-31.
 M.F. Shi, K.M. Pickett and K.K. Bhatt. Formability issues in the application of Tailor welded blank sheets. Society of Automotive Engineers, New York, NY, ETATS-UNIS, (1993).
 A.S.f.T.a.M. (ASTM), Metals test methods and analytical procedures. (1999) 78–98, 501–8.
 S.S. Hecker. A cup test for assessing stretchability. Met. Eng. . 14 (1974) 30–6.
 S.K. Panda, V.H. Baltazar Hernandez, M.L. Kuntz and Y. Zhou. Formability analysis of diode-laser-welded Tailored blanks of advanced high-strength steel sheet. Metallurgical and Materials Transactions A. 40A (2009) 1955-67.
 S.B. Levy, A comparison of empirical forming limit curves for low carbon steel with theoretical forming limit curves of ramaekers and bongaerts, IDDRG, (1996).
 S.K. Panda, D.R. Kumar, H. Kumar and A.K. Nath. Characterization of tensile properties of tailor welded IF steel sheets and their formability in stretch forming. Journal of Materials Processing Technology. 183 (2007) 321-32.
 R. Hill. A theory of the yielding and plastic flow of anisotropic metals. Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences. 193 (1948) 281-97.
 Abaqus User Guide, ABAQUS Analysis User's Manual.