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

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

  • 강성종 (대구가톨릭대학교 기계자동차공학부) ;
  • 이상민 (대구가톨릭대학교 대학원 자동차공학과)
  • Received : 2018.12.06
  • Accepted : 2019.02.20
  • Published : 2019.03.31

Abstract

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.

Keywords

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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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Acknowledgement

Supported by : 대구가톨릭대학교

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