International Journal of Automotive Technology

The Korean Society of Automotive Engineers (한국자동차공학회)
권호 표지

NUMERICAL SIMULATION OF CONVEX AND CONCAVE TUBES WITH CONSIDERATION OF STRAIN RATE SENSITIVITY

  • Ye, B.W. (School of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Oh, S. (School of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Cho, Y.B. (TNO Automotive Korea Ltd.) ;
  • Sin, H.C. (School of Mechanical and Aerospace Engineering, Seoul National University)
  • Published : 2007.04.30
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Abstract

The present paper deals with the application of the explicit finite element code, PAM-CRASH, to simulate the crash behavior of steel thin-walled tubes with various cross-sections subjected to axial loading. An isotropic elastic, linear strain-hardening material model was used in the finite element analysis and the strain-rate sensitivity of mild steel was modeled by using the Cowper-Symonds constitutive equation with modified coefficients. The modified coefficients were applied in numerical collapse simulations of 11 types of thin-walled polygon tubes: 7 convex polygon tubes and 4 concave polygon tubes. The results show that the thin hexagonal tube and the thick octagonal tube showed relatively good performance within the convex polygon tubes. The crush strengths of the hexagonal and octagonal tubes increased by about 20% and 25% from the crush strength of the square tube, respectively. Among the concave tubes, the I-type tube showed the best performance. Its crush strength was about 50% higher than the crush strength of the square tube.

Keywords

References

  1. Abramowicz, W. and Jones, N. (1984). Dynamic axial crushing of square tubes. Int. J. Impact Engng. 2, 2, 179-208 https://doi.org/10.1016/0734-743X(84)90005-8
  2. Abramowicz, W. and Wierzbicki, T. (1983). On the crushing mechanics of thin-walled structures. J. Applied Mechanics, 50, 727-734 https://doi.org/10.1115/1.3167137
  3. Abramowicz, W. and Wierzbicki, T. (1989). Axial crushing of multicorner sheet metal columns. J. Applied Mechanics, 56, 113-120 https://doi.org/10.1115/1.3176030
  4. Gonzalez, M., Chitoor, K., Kim, H. S. and Tyan, T. (2005). Testing and modeling of metalic multicorner columns in axial crush. SAE Paper No. 2005-01-353
  5. Kang, W. J. and Huh, H. (2000). Crash analysis of autobody structures considering the strain-rate hardening effect. Int. J. Automotive Technology 1, 1, 35-41
  6. Kim, S.-K., Im, K.-H., Hwang, C.-S. and Yang, I.-Y. (2002). A study on experimental characteristic of energy absorption control in thin-walled tubes for the use of vehicular-structure. Int. J. Automotive Technology 3, 4, 137-145
  7. Mahmood, H. F. and Paluszny, A. (1981). Design of thin walled columns for crash energy management - Their strength and mode of collapse. SAE Paper No. 811302
  8. Mamalis, A. G., Manolakos, D. E., Ioannidis, M. B., Kostazos, P. K. and Dimitriou, C. (2003). Finite element simulation of the axial collapse of metallic thin-walled tubes with octagonal cross-section. Thin-Walled Structures, 43, 1646-1661 https://doi.org/10.1016/j.tws.2005.03.001
  9. Ohkubo, Y., Akamatsu, T. and Shirasawa, K. (1974). Mean crushing strength of closed-hat section members. SAE Paper No. 740040
  10. Otubushin, A. (1998). Detailed validation of an non-linear finite element code using dynamic axial crushing of a square tube. Int. J. Impact Engng. 21, 5, 349-368 https://doi.org/10.1016/S0734-743X(97)00041-9
  11. Rossi, A., Fawaz, Z. and Behdinan, K. (2005). Numerical simulation of the axial collapse of thin-walled polygonal section tubes, Thin-Walled Structures, 43, 1646-1661 https://doi.org/10.1016/j.tws.2005.03.001
  12. Yamashita, M., Gotoh, M. and Sawairi, Y. (2003). Axial crush of hollow cylindrical structures with various polygonal cross-sections numerical simulation and experiment. J. Materials Processing Technology, 140, 59-64 https://doi.org/10.1016/S0924-0136(03)00821-5