Rapid Identification Method of Equivalent Parameters for Lattice Core Structures Based on Beam Elements

CHEN Junming; DING Xing; DOU Yibin; XU Quan; LI Yulin; LI Weiwei

doi:10.7643/ issn.1672-9242.2025.11.014

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Equipment Environmental Engineering ›› 2025, Vol. 22 ›› Issue (11) : 135-142. DOI: 10.7643/ issn.1672-9242.2025.11.014

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Rapid Identification Method of Equivalent Parameters for Lattice Core Structures Based on Beam Elements

CHEN Junming, DING Xing, DOU Yibin, XU Quan, LI Yulin, LI Weiwei^*

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Abstract

Lattice meta-materials are widely used in aerospace engineering due to their exceptional mechanical properties such as ultra-lightweight, high specific strength, and high specific stiffness. However, their large number of cells and small size make it difficult to generate the grid and require a large amount of calculation, which seriously restricts their application development. Traditional lattice design methods demonstrate a good prediction of the equivalent performance of the lattice itself, but ignore the contact stiffness problem between the skin and the lattice. The work aims to have a rapid solution of the equivalent performance of lattice sandwich structures while ensuring accuracy. A rapid beam-element lattice modeling program was developedthrough python-based secondary development of Abaqus, and a novel rapid identification method was proposed for equivalent parameters of lattice sandwich structures using beam elements combined with the representative volume element (RVE) method. The results demonstrated that through the comparison of theoretical research and numerical methods, after using this method, the errors of the equivalent thermal parameters, mechanical parameters, etc. of the lattice could be controlled within 1%.For the performance prediction of lattice sandwich structures, beam elements are more accurate than bar elements. The errors in lattice performance prediction mainly stem from anisotropy and contact stiffness. By using the new equivalent parameter identification method, the error can be controlled within 1%, providing a new solution for the equivalent performance prediction of lattice sandwich structures.

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beam element / equivalent performance / parameter identification / representative volume element

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CHEN Junming, DING Xing, DOU Yibin, XU Quan, LI Yulin, LI Weiwei. Rapid Identification Method of Equivalent Parameters for Lattice Core Structures Based on Beam Elements[J]. Equipment Environmental Engineering. 2025, 22(11): 135-142 https://doi.org/10.7643/ issn.1672-9242.2025.11.014

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