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首页> 美国卫生研究院文献>Materials >Crashworthiness Optimization Design of Aluminum Alloy Thin-Walled Triangle Column Based on Bioinspired Strategy
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Crashworthiness Optimization Design of Aluminum Alloy Thin-Walled Triangle Column Based on Bioinspired Strategy

机译：基于生物启发策略的铝合金薄壁三角柱耐撞性优化设计

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摘要

Aluminum alloy thin-walled structures have been well used in applications of energy absorption. In the present work, a bioinspired design strategy for aluminum alloy thin-walled structures is proposed to improve the performance of out-of-plane crashworthiness by altering the material distribution. According to the proposed strategy, a novel fractal thin-walled triangle column (FTTC) is designed, which is composed by iteratively applying the affine transformation of a base triangle up to 2nd-order. The finite element model is established to investigate the out-of-plane crashworthiness of FTTC and validated by experiment results. The numerical analysis of the crashworthiness of FTTC with different fractal orders (0th, 1st and 2nd) are performed, and the results show that 1st- and 2nd-order FTTC enhance the energy absorption of structures and crush force efficiency. In particular, 2nd-order FTTC has better energy absorption ability due to the optimal distribution of materials, which are efficiently organized by the proposed bioinspired design strategy. In addition, a parameter study is performed to investigate the effect of FTTC geometric details on the crushing procedure. The collapse mode shows that it tends to change from unstable to stable with the increase in thickness and side length and the decrease in height. Moreover, a positive relevant relationship is identified between the thickness and the crashworthiness for FTTC.
机译：铝合金薄壁结构已经很好地用于能量吸收的应用中。在目前的工作中，提出了一种铝合金薄壁结构的生物启发设计策略，以通过改变材料分布来改善面外耐撞性。根据提出的策略，设计了一种新颖的分形薄壁三角柱（FTTC），该结构由迭代应用基三角的仿射变换直至二阶组成。建立了有限元模型以研究FTTC的面外耐撞性，并通过实验结果进行了验证。对不同分形阶数（0、1、2）的FTTC的耐撞性进行了数值分析，结果表明，一阶和二阶FTTC增强了结构的能量吸收和破碎力效率。特别地，由于材料的最佳分布，二阶FTTC具有更好的能量吸收能力，这些材料可以通过建议的生物启发设计策略有效地组织起来。另外，进行参数研究以研究FTTC几何细节对破碎程序的影响。塌陷模式表明，随着厚度和边长的增加以及高度的降低，塌陷模式倾向于从不稳定变为稳定。此外，在FTTC的厚度和耐撞性之间确定了正相关关系。

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