Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
권호 표지

A Study on Axial Collapse Characteristics of Spot Welded Double-Hat Shaped Section Members by FEM

FEM에 의한 점용접된 이중모자형 단면부재의 축방향 압궤특성에 관한 연구

  • Published : 2001.07.01
Download PDF
⟨ Previous Next ⟩

Abstract

The widely used spot welded section members of vehicles are structures which absorb most of the energy in a front-end collision. In front-end collision, sufficiently absorbed in the front parts, the impact energy does not reach the passengers. Simultaneously, the frame gets less damaged. This structures have to be very stiff, but collapse progressively to absorb the kinetic energy as expected. In the view of stiffness, the double-hat shaped section member is stiffer than the hat shaped section member. In progress of collapse, the hat shaped section member is collapsing progressively, but the double-hat shaped section member does not due to stiffness. An analysis on the hat shaped section member was previously completed. This paper concerns the collapse characteristic of the double-hat shaped section member. In the program system presented in this study, an explicit finite element code, LS-DYNA3D is adopted for simulating complicate collapse behavior of double hat shaped section members with respect to spot weld pitches. And comparing with the results from the quasi-static and impact experiment, the simulation has been verified.

Keywords

References

  1. M. Avalle and G. Belingardi, 'Experimental evaluation of the strain field history during plastic progressive folding of aluminium circular tubes,' International Journal of Mechanical Science, Vol. 39, pp. 575-583, 1997 https://doi.org/10.1016/S0020-7403(96)00063-X
  2. Wiodzimierz Abramowicz and Norman Jones, 'Dynamic axial crushing of square tubes,' International Journal of Impact Engineering, Vol. 2, pp. 179-208, 1984 https://doi.org/10.1016/0734-743X(84)90005-8
  3. M. Langseth and O. S. Hopperstad, 'Statics and dynamic axial crashing of square thin-walled aluminium extrusions,' International Journal of Impact Engineering, Vol. 18, pp. 949-968, 1996 https://doi.org/10.1016/S0734-743X(96)00025-5
  4. M. D. White, N. Jones, 'Experimental quasi-static axial crushing of top-hat and double-hat thin-walled sections,' International Journal of Mechanical Science, Vol. 41, pp. 179-208, 1999 https://doi.org/10.1016/S0020-7403(98)00047-2
  5. 차천석, 김정호, 양인영, '모자형 단면 점용접부재의 축방향 압궤특성에 관한 연구(I)', 한국정밀공학회지, 제 17권, 제 3호, pp. 192-199, 2000.3
  6. 차천석, 양인영, '모자형 단면 점용접부재의 축방향 압궤특성에 관한 연구(II)', 한국정밀공학회지, 제 17권, 제 5호, pp. 192-199, 2000. 5
  7. Livermore Software Technology Corporation, 'LS-DYNA User's manual,' Version 940, 1997
  8. Engineering Technology Associates, Inc., FEMB version 26.4 user's manual, 1996
  9. Livermore Software Technology Corporation, 'LS-TAURUS user's manual,' 1996
  10. Livermore Software Technology Corporation, LS-DYNA3D theoretical manual, pp. 6.1-6.10, 1993
  11. R. H. Grzebieta and N. W. Murray, 'Energy absorpotion of an initially imperfect strut subjected to an impact load,' International Journal of Impact Engineering, Vol. 4, pp. 147-159, 1986 https://doi.org/10.1016/0734-743X(86)90002-3
  12. N. Jonse, Structural impact: Cambridge University Press, pp. 403-405, 1989
  13. 차천석, 강종엽, 양인영, 'FEM에 의한 단일모자형 단면부재의 축방향 충격압궤 해석,' 한국정밀공학회지, 제17권, 제 12호, pp. 129-136, 2000. 12