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ZHENG Yu-qing, ZHU Xi-chan, HU Qiang, LIU Jin. Effect of ridgeline strengthening in thin-walled structure[J]. Journal of Traffic and Transportation Engineering, 2016, 16(5): 57-65. doi: 10.19818/j.cnki.1671-1637.2016.05.007
Citation: ZHENG Yu-qing, ZHU Xi-chan, HU Qiang, LIU Jin. Effect of ridgeline strengthening in thin-walled structure[J]. Journal of Traffic and Transportation Engineering, 2016, 16(5): 57-65. doi: 10.19818/j.cnki.1671-1637.2016.05.007
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Effect of ridgeline strengthening in thin-walled structure

doi: 10.19818/j.cnki.1671-1637.2016.05.007
  • 1.

    School of Automotive Studies, Tongji University

  • 2.

    Institute of Applied Physics, Jiangxi Academy of Sciences

More Information
  • Author Bio:

    ZHENG Yu-qing(1983-), male, doctoral student, +86-21-69589714, 812york@tongji.edu.cn

    ZHU Xi-chan(1962-), male, professor, PhD, +86-21-69589714, xczhu@163.com

  • Received Date: 2015-05-13
  • Publish Date: 2016-10-25
    Abstract
  • The theoretical expressions of mean crushing force, energy absorbing prediction and ridgeline strengthening(RS)effect of thin-walled RS square tube were respectively derived out based on the ideal folding element model of square tube, the energy dissipation decomposition method during its plastic deformation process, and the modified energy balance equation of thinwalled RS square tube subjected to static axial crushing effect.A series of finite element models of thin-walled RS square tube subjected to quasi-static axial crushing were built, and imported into LS-DYNA program to conduct elastic-plastic dynamics simulation.The mean crushing forces were obtained, and the sensivity of ridgeline stress strengthening was investigated.The ridgeline strengthening technology was applied to the ridgeline strength design of front bumper beam and crashboxes for a vehicle.The corresponding thin-walled structures with higher strength steel were replaced by the assembly of ultra stress strengthened ridgelines and general mild steelplates.The finite element model of front bumper substructure system with strengthened ridgelines for individual evaluation was set up based on the existing finite element model verified by crash test.At 50km·h~(-1), the front crash simulation tests were conducted with the ridgeline strengthening model and the original model respectively.Simulation result indicates that the axial cushing force property of thin-walled RS square tube with the yield strength ratios of ridgeline to plate ranging from 1to 4can be predicted by using the mean crushing force formula, and the maximum deviation between theoretical result and simulation result is lower than 5.66%.Front crash simulation result comparison of the front bumper substructure before and after ridgeline strengthening shows similar plastic deformation modes and force transmission routes, and the energy absorption deviation is lower than 0.3 kJ.So, the general mild steel front bumper substructure with selective stress strengthened ridgelines can equivalently replace the corresponding higher strength steel front bumper substructure.

     

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