Crashworthiness analysis and optimization of bionic corrugated sandwich structures

HUANG Han; XU Shucai; CHEN Heng

doi:10.11883/bzycj-2020-0275

Volume 41 Issue 8

Aug. 2021

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HUANG Han, XU Shucai, CHEN Heng. Crashworthiness analysis and optimization of bionic corrugated sandwich structures[J]. Explosion And Shock Waves, 2021, 41(8): 083102. doi: 10.11883/bzycj-2020-0275

Citation:

HUANG Han, XU Shucai, CHEN Heng. Crashworthiness analysis and optimization of bionic corrugated sandwich structures[J]. Explosion And Shock Waves, 2021, 41(8): 083102. doi: 10.11883/bzycj-2020-0275

HUANG Han, XU Shucai, CHEN Heng. Crashworthiness analysis and optimization of bionic corrugated sandwich structures[J]. Explosion And Shock Waves, 2021, 41(8): 083102. doi: 10.11883/bzycj-2020-0275

Citation:

HUANG Han, XU Shucai, CHEN Heng. Crashworthiness analysis and optimization of bionic corrugated sandwich structures[J]. Explosion And Shock Waves, 2021, 41(8): 083102. doi: 10.11883/bzycj-2020-0275

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Crashworthiness analysis and optimization of bionic corrugated sandwich structures

doi: 10.11883/bzycj-2020-0275

HUANG Han^1
,,
XU Shucai^{2
,
,},
CHEN Heng³

1.
Academy of Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, Jiangsu, China
2.
State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
3.
Field Engineering College, Army Engineering University of PLA, Nanjing 210001, Jiangsu, China

Received Date: 2020-08-11
Rev Recd Date: 2020-10-12

Available Online: 2021-07-12

Publish Date: 2021-08-05

Abstract

Abstract

To improve the crashworthiness of thin-walled sandwich structures, a series of bionic corrugated sandwich structures with triangular elements (the height-to-width ratios of the elements are defined as γ) were designed inspired by the structures of shrimp chelas, including single-layer, double-layer and three-layer corrugated sandwich structures (γ₁, γ₂ and γ₃ denotes the height-to-width ratios of single-layer, double-layer and three-layer elements, respectively). To analyze the deformation and mechanical response of the bionic thin-walled structures, the finite element method was adopted based on LS-DYNA and HyperMesh. By taking the initial peak load F_p and specific energy absorption E_s as crashworthiness indexes, the influences of γ on the crashworthiness of the corrugated sandwich structures were discussed. The crashworthiness of the single-layer sandwich structures becomes worse gradually when the parameters γ exceed a certain value. For the double-layer sandwich structures, the influences of the parameters γ₂ in the lower layers on the crashworthiness is greater than that of the parameters γ₁ in the upper layers.. The F_p decreases by 37.8% with the increase of γ₂, which means the greater γ₂ of the lower layer is beneficial to improve the crashworthiness of the structure. For the three-layer sandwich structures, the influence of γ on crashworthiness indexes was investigated by range and variance analysis methods. The results show that the γ₃ has the most significant influence on E_s, and the significance level reaches 0.1. Finally, the optimal parameters of the bionic corrugated sandwich structures were obtained by using the multi-objective particle swarm optimization method based on a polynomial regression (PR) meta model. The optimal results show that the crashworthiness of the single-layer corrugated sandwich structures improves with the increase of γ. For the double-layer corrugated sandwich structures, The γ of the lower layer affects the crashworthiness more significantly than the γ of the upper layer. The three-layer corrugated sandwich structure with lower γ has higher E_s. The optimal dimensions of the single-layer, double-layer and three-layer structures are γ = 0.8; γ₁ = 0.5 and γ₂ = 1.2; γ₁ = 0.6, γ₂ = 0.6 and γ₃ = 0.9, respectively. The above results are helpful for the design of the thin-walled sandwich structures.
- thin-walled sandwich structure,
- crashworthiness,
- structure optimization,
- engineering bionics,
- impact

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References(20)

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