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Crashworthiness optimization design of foam-filled tapered decagonal structures subjected to axial and oblique impacts

泡沫填充锥形十面体结构在轴向和斜向冲击下的耐撞性优化设计

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Abstract

In this research, crashworthiness of polyurethane foam-filled tapered decagonal structures with different ratios of a/b=0, 0.25, 0.5, 0.75 and 1 was evaluated under axial and oblique impacts. These new designed structures contained inner and outer tapered tubes, and four stiffening plates connected them together. The parameter a/b corresponds to the inner tube side length to the outer tube one. In addition, the space between the inner and outer tubes was filled with polyurethane foam. After validating the finite element model generated in LS-DYNA using the results of experimental tests, crashworthiness indicators of SEA (specific energy absorption) and Fmax (peak crushing force) were obtained for the studied structures. Based on the TOPSIS calculations, the semi-foam filled decagonal structure with the ratio of a/b=0.5 demonstrated the best crashworthiness capability among the studied ratios of a/b. Finally, optimum thicknesses (t1 (thickness of the outer tube), t2 (thickness of the inner tube), t3 (thickness of the stiffening plates)) of the selected decagonal structure were obtained by adopting RBF (radial basis function) neural network and genetic algorithm.

摘要

本研究评估了a/b=0, 0.25,0.5,0.75 和1 的聚氨酯泡沫填充锥形十面体结构在轴向和斜向冲 击下的耐撞性。这些新设计的结构包括内部和外部锥形管和四个加强板将它们连接在一起。参数a/b对应于内胎侧长到外胎侧长。此外,内外管之间的空间填充了聚氨酯泡沫。利用试验结果对LS-DYNA 产生的有限元模型进行了验证,得到了研究结构的SEA(吸收能比)和Fmax(峰值破碎力)的耐撞性指标。 根据TOPSIS 的计算,a/b=0.5 的半泡沫填充十面体结构表现出最佳的耐撞性能。最后,采用径向基函 数神经网络和遗传算法分别得到所选十面体结构的最佳厚度(外管厚度t1、内管厚度t2、加强板厚度t3)。

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Acknowledgements

This research project has been financially supported by the Office of Vice Chancellor for Research under a research grant of Project No.: 1365-96/7/22 from University of Mohaghegh Ardabili. This support is gratefully acknowledged.

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  1. Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, 179, Iran

    Sadjad Pirmohammad, Soheil Ahmadi-Saravani & Javid Zakavi S.

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  1. Sadjad Pirmohammad
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Pirmohammad, S., Ahmadi-Saravani, S. & Zakavi S., J. Crashworthiness optimization design of foam-filled tapered decagonal structures subjected to axial and oblique impacts. J. Cent. South Univ. 26, 2729–2745 (2019). https://doi.org/10.1007/s11771-019-4209-1

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