Dynamic Tensile Characteristics of TRIP-Type and DP-Type Sheets for an Auto-Body

Abstract:

This paper investigates the dynamic tensile characteristics of TRIP600, TRIP800, DP600 and DP800 at the range of strain rate from 0.003 to 200/s. The tensile test acquires stress−strain curves and the strain rate sensitivity of each material. Experimental results show two important aspects for TRIP-type and DP-type sheets quantitatively: the flow stress increases as the strain rate increases; the elongation is not a monotonic function of the strain rate and increases at the same level of the strain rate even when the strain rate increases. In order to investigate the pre-strain effect for two types of metals at the high strain rate, TRIP600 and DP600 were elongated with the pre-strain of 5 and 10% at the strain rate of 0.003/s. Then, dynamic tensile tests were carried out at the strain rate of 0.003, 1, 10 and 100/s. The results demonstrate that the material properties of TRIP600 and DP600 are noticeably influenced by the pre-strain when the strain rate was over 1/s. The ultimate tensile strength as well as the yield stress increases due to the pre-strain effect.

• Periodical: Key Engineering Materials (Volumes 340-341)
• Pages: 255-262
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.340-341.255
• Online since: June 2007
• Authors: Seok Bong Kim, Hoon Huh, Sung Ho Park, Ji Ho Lim
• Keywords: DP-Type Sheets, Dynamic Tensile Characteristics, Pre-Strain Effect, Strain Rate, TRIP-Type Sheets

References

[1] F.D. Fischer, G. Reisner, E. Werner, K. Tanaka, G. Cailletaud and T. Antretter: Int. J. Plasticity Vol. 16 (2000), p.723.

DOI: 10.1016/s0749-6419(99)00078-9

[2] J. Adamczyk and A. Grajcar: J. Mater. Proc. Technol. Vol. 162-163 (2005), p.267.

[3] T. Iwamoto, T. Tsuta and Y. Tomita: Int. J. Mech. Sci. Vol. 40 (1998), p.173.

[4] A.S. Khan and S. Huang: Int. J. Plasticity Vol. 8 (1992), p.397.

[5] K. Ishikawa and S. Tanimura: Int. J. Plasticity Vol. 8 (1992), p.947.

[6] H. Huh, J.H. Lim, S.B. Kim, S.S. Han and S.H. Park: Key Eng. Mat. Vol. 274 (2004), p.403.

[7] K.J. Kim: Int. J. Automotive Technol. Vol. 7 (2006), p.485.

[8] W.J. Kang and H. Huh: Int. J. Automotive Technol. Vol. 1 (2000), p.35.

[9] H. Huh, J.H. Lim J.H. Song, K.S. Lee, Y.W. Lee and S.S. Han: Int. J. Automotive Technol. Vol. 4 (2003), p.149.

[10] R.M. Cleveland and A.K. Ghosh: Int. J. Plasticity Vol. 18 (1992), p.769.

[11] S.B. Kim, J.H. Lim, H. Huh and J.D. Lim: Trans. Korean Society of Automotive Eng. Vol. 12 (2004), p.204.

[12] J.H. Lim, S.B. Kim, J.S. Kim, H. Huh, J.D. Lim and S.H. Park: Trans. Korean Society of Automotive Eng. Vol. 13 (2005), p.127.

[13] H. Huh, J.H. Song, H.J. Lee and S.H. Park: Plasticity 2006, Halifax, NS, Canada (2006), p.139.

[14] Y. Tomita and T. Iwamoto: Int. J. Mech. Sci. Vol. 12 (1995), p.1295.