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An Optimal Design of the Two-Staged Square Sectional Combined Energy Absorption Structure with Local Surface Nanocrystallization
Acta Mechanica Solida Sinica ( IF 2.2 ) Pub Date : 2021-10-19 , DOI: 10.1007/s10338-021-00272-6
Xinsheng Xu 1 , Jianlong Qu 1 , Tong Li 1 , Zhen Zhao 1 , Zhenhuan Zhou 1 , Zhenzhen Tong 2
Affiliation  

In this paper, a local surface nanocrystallization technology is used for thin-walled structures with square cross sections, and an energy absorption device of two-staged combined energy absorption structure is proposed. In virtue of the surface nanocrystallization that enables to change the material on local positions, the structural deformation is induced and controlled to maximize the energy absorption capacity. A numerical model of the two-staged combined energy absorption structure is established, and the local surface nanocrystallization layout is optimized. The results show that the specific energy absorption of two-staged combined structure with local surface nanocrystallization can be increased by 34.36% compared with the untreated counterpart of the same material and structural shape. The ratio between the first and second peak crushing forces and the energy absorption allocation ratio between the two stages can be adjusted in the ranges of 0.26–0.55 and 0.31–0.45, respectively, which can be controlled by the local surface nanocrystallization designs. The numerical simulation and experimental results are in good agreement, which shows that the design for energy absorption device with local surface nanocrystallization is feasible and effective.



中文翻译:

具有局部表面纳米化的两级方形截面组合吸能结构的优化设计

本文将局部表面纳米化技术用于方形截面的薄壁结构,提出了一种两级组合吸能结构的吸能装置。凭借表面纳米化能够改变局部位置的材料,诱导和控制结构变形以最大化能量吸收能力。建立了两阶段组合吸能结构的数值模型,优化了局部表面纳米化布局。结果表明,与相同材料和结构形状的未处理对应物相比,具有局部表面纳米化的两阶段组合结构的比能量吸收可提高34.36%。第一和第二峰值破碎力的比值和两级之间的能量吸收分配比可以分别在 0.26-0.55 和 0.31-0.45 的范围内调整,这可以通过局部表面纳米化设计来控制。数值模拟和实验结果吻合较好,表明局部表面纳米化的能量吸收装置设计是可行和有效的。

更新日期:2021-10-21
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