Abstract
Crash-box is a significant part of automotive passive safety system and serves as a main energy absorption device in frontal impact scenario. In this paper, a novel crash-box integrating an outer thin-walled tube and an inner auxetic cellular core has been designed and comprehensively investigated under axial load. The impact simulation of the auxetic crash-box has been carried out, and the results show that introduction of the auxetic core can improve its energy absorption capacity without increasing too much peak impact force. Based on the sensitivity analysis, the effects of its geometric parameters on the crashworthiness performance have been studied. Finally, collaborative optimization of the auxetic crash-box has been performed to simultaneously improve its crashworthiness under the low-speed (15 km/h) and high-speed (40 km/h) impact cases. In the optimization procedure, the least square support vector regression (LS-SVR) method and an improved particle swarm optimization (IPSO) algorithm with time-varying coefficients have been utilized. The results demonstrate that the optimized crash-box can comprehensively improve the energy absorption and impact force characteristics effectively. The auxetic crash-box and the collaborative optimization approach provide extensive references for the application of auxetic structure in vehicle crashworthiness design.
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Acknowledgments
This research was funded by the Fundamental Research Funds for the Central Universities, Grant number 309181B8809 and 30919011203; the Natural Science Foundation of Jiangsu Province, Grant number BK20190462; the National Natural Science Foundation of China, Grant number 51975295.
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Conceptualization, T.W. and Z.L.; methodology, T.W.; software, Z.L.; validation, G.M.H.; formal analysis, T.W.; investigation, T.W.; resources, Z.L.; writing—original draft preparation, T.W.; visualization, G.M.H.; supervision, L.W.; project administration, L.W.; funding acquisition, L.W.
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All necessary data of modeled structure have been given in the text of the paper (e.g., geometry of the crash-box, material properties, simulation conditions). In chapter 4.1 and 4.3, the mathematical formulation of the IPSO, and corresponding coefficients were detailed.
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Wang, T., Li, Z., Wang, L. et al. Crashworthiness analysis and collaborative optimization design for a novel crash-box with re-entrant auxetic core. Struct Multidisc Optim 62, 2167–2179 (2020). https://doi.org/10.1007/s00158-020-02568-6
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DOI: https://doi.org/10.1007/s00158-020-02568-6