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도어 임팩트 빔의 3점 굽힘 최대강도와 차량 장착 시 굽힘 좌굴강도와의 관계

The Relation of Bending Buckling Strength in Vehicle and Three Point Bending Maximum Strength of Door Impact Beam

  • 강성종 (대구가톨릭대학교 기계자동차공학부) ;
  • 이상민 (대구가톨릭대학교 대학원 자동차공학과)
  • 투고 : 2018.12.06
  • 심사 : 2019.02.20
  • 발행 : 2019.03.31

초록

First, three point bending analysis for the inclined press door impact beam was carried out to investigate inclination angle effect on the maximum strength with varying support distance. Next, for the system model with spring elements representing body stiffness at door mounting area, the bending structural behavior of impact beam mounted on vehicle was estimated. The mounting distance and inclination angle were changed and the beam bending buckling strength was presumed at the head displacement below which spring stiffness change has little effect on the load. Finally strength ratio to predict the bending buckling strength of impact beam mounted on vehicle from three point bending maximum strength of fixed support distance was suggested.

키워드

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Fig. 1 Door impact beam

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Fig. 2 FMVSS 214 side impact pole test

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Fig. 3 Press door impact beam section

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Fig. 4 Three point bending analysis model of TB_600_0°with different overhang length

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Fig. 5 Load-displacement curve from three point bending analysis of TB_600_0° with different overhang length

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Fig. 6 Load-displacement curve from three point bending analysis of Ltb=600mm

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Fig. 7 Deformed shape of TB_800_20°

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Fig. 8 System analysis model of Ls=950mm, θ=20°

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Fig. 9 Spring stiffness

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Fig. 10 System analysis model of Ls=855mm

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Fig. 11 Load-displacement curve from system analysis

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Fig. 12 Deformed shape of SS_855_20° at head displacement100mm and 200mm

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Fig. 13 Strain energy from system analysis

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Fig. 14 Load-displacement curve from system analysis of Ls=950mm model with changed spring stiffness

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Fig. 16 Strength ratio SR400 and SR500

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Fig. 15 Load-displacement curve from system analysis of Ls=760mm model with changed spring stiffness

Table 1 Maximum strength from three point bending analysis

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Table 2 Strain energy from system analysis(a) Strain energy

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Table 3 Impact beam buckling strength

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Table 4 Maximum strength from three point bending analysis of support distance 400mm and 500mm

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참고문헌

  1. Oh, H. J., Kim, S. K. and Lim, K. H., 2013, "A Study on Development of the Pole Side Impact Sled Test Using WorldSID", Journal of Auto-Vehicle Safety Association, Vol. 5, No. 2, pp. 5-10. https://doi.org/10.22680/KASA.2013.5.2.005
  2. Yoo, D. Y., Kim, J. W., Cho, K. S., Beom, H. K. and Kwon, O. S., 2006, "A Study of Numerical Analysis for Improvement of US NCAP Side Impact Performance", KSAE Spring Conference Proceedings, pp. 1088-1093, 2006.
  3. Bae, G. H. and Huh, H., 2012, "Comparison of the Optimum Designs of Center Pillar Assembly of an Auto-body between Conventional Steel and AHSS with a Simplified Side Impact Analysis", Int. J. of Automotive Technology, Vol. 13, No. 2, pp. 205-213. https://doi.org/10.1007/s12239-012-0017-4
  4. Kim, S. G., Yang, H. J., Kim, I. K. and Kin, Y. S., 2014, "A Study on Vehicle Structure for New Korea NCAP Side Barrier Test", KSAE Annual Conference Proceedings, pp. 891-896.
  5. Lim, H., Lim, S. Y. and Chun, Y. B., 2014, "Study on Optimal Design of Cold Forming Door Impact Member", KSAE Annual Conference Proceedings, pp. 980-990.
  6. So, B. S, Kim, J. H., Choi, H. T. and Ha, C., 2012, "Shape Development of Door Mounting Integrated Impact Beam", Daegu-Gyeongbuk KSAE Spring Conference Proceeding, pp. 25-32.
  7. Jo, K. R. and Kang, S. J., 2017, "The Section Design of Press Door Impact Beam for Improving Bending Strength", Transactions of KSAE, Vol. 25, No. 1, pp. 74-81. https://doi.org/10.7467/KSAE.2017.25.1.074
  8. Jo, K. R. and Kang, S. J., 2018, "The Effect of Mounting Location in Door and Body Stiffness on Press Door Impact Beam Bending Strength", Transactions of KSAE, Vol. 26, No. 2, pp. 272-278. https://doi.org/10.7467/KSAE.2018.26.2.272
  9. LS-DYNA User's manual, 2006, "Nonlinear Dynamic Analysis of Structures", Version 971, LSTC.
  10. Chun, B. K. and Kang, S. J., 1994, "Development of Side Door Intrusion Analysis Technique Using Simple Concept Model", KSAE Spring Conference Proceedings, pp. 517-524.