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• Study and Optimization of Energy Absorption Characteristics of Windowed Multi-Cell Thin-Walled Conical Tube under the Axial Loading

  T. Wei, X. Lin, X. Zhou, C. Kou, S. Zeng

  Rev. int. métodos numér. cálc. diseño ing. (2025). Vol. 41, (2), 17

  
  

  Abstract

  Conical tubes have attracted significant attention due to their more stable deformation mode and lower initial peak load compared to non-conical tubes under axial load. Firstly, based on LS-DYNA software and a multiobjective optimization algorithm, simulations of the conical tube structure under axial load were conducted to determine the optimal dimensions of the conical tube. Then, based on the optimal unicellular conical tube structure, the energy absorption characteristics of the windowed multicell conical tube structures with horizontal and vertical partitions and square holes were designed, and a predictive expression for the mean load was proposed based on the simulation data. Finally, the results show that the optimal dimensions of the mono-cell conical tube are ϕ= 10° and t = 1.29 mm, while the optimal dimensions of the windowed multi-cell conical tube structure are four transverse split panels (v= 4), four vertical split panels (n= 4), and four holes (k = 4). Compared to the unicellular conical tube, the energy absorption efficiency of the windowed multi-cell conical tube has increased by 70.06%, while the initial peak load has decreased by 23.60%. Furthermore, both simulation and experimental results show that the predictive expression for the mean load of the windowed multicell conical tube exhibits good universality and reliability. The research results provide a new design concept for thin-walled conical tube energy absorption boxes.OPEN ACCESS Received: 24/07/2024 Accepted: 09/12/2024 Published: 20/04/2025

  Abstract
  Conical tubes have attracted significant attention due to their more stable deformation mode and lower initial peak load compared to non-conical tubes under axial load. Firstly, [...]

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• Calculation of the initial peak loads on thin-walled circular tubes with internal and external staggered grooves under low-velocity impacts

  S. Chen, M. Zhang, L. Zhao, T. Wei

  Rev. int. métodos numér. cálc. diseño ing. (2024). Vol. 40, (2), 23

  
  

  Abstract

  Thin-walled cylindrical tube structures with particular defects exhibit more stable energy absorption characteristics and lower initial peak loads when subjected to axial impact. The present study systematically investigates the effect of the depth, width, and number of grooves in both internal and external groove structures on the energy absorption characteristics of thin-walled cylindrical tubes made of A6061 under axial impact loading. An expression for predicting the initial peak load is formulated, and its validity is confirmed through experimentation and extrapolation. The results indicate that augmenting the depth, width and quantity of grooves can lower the initial peak load, and the depth of grooves bears the most pronounced impact. The initial load hypothesis is congruent with both experiments and simulations, with a initial peak error of just -7.64%. To affirm the generality of the theoretical computations, eight distinct groups of elongated structural simulations were compared, and the initial peak load's error was scarcely above 10%. This study serves as a point of reference for designing energy-absorbing structures with internal and external grooves when subjected to low-velocity axial impact.

  Abstract
  Thin-walled cylindrical tube structures with particular defects exhibit more stable energy absorption characteristics and lower initial peak loads when subjected to axial [...]

  • 413
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