Study on energy absorption characteristics of biomimetic fractal sandwich plate core structure
YU Di
WANG Zhaoyang
LIU Yansong
ZOU Meng
Abstract：To enhance the energy absorption efficiency of conventional sandwich panels,a biomimetic tree-like fractal core(BTLFC)inspired by the dendritic fractal structure of the royal lotus leaf vein was designed.Firstly,quasi-static compression tests revealed that the 2-order BTLFC exhibited a specific energy absorption 5.69%higher and an average load 4.46%greater than traditional honeycomb cores.Secondly,a finite element numerical model of the BTLFC was established;combined with quasi-static compression test data,the finite element model error was within 2.2%,demonstrating high accuracy of the model.Finally,Latin hypercube test design,Kriging surrogate model,and the non-dominated sorting genetic algorithm-II(NSGA-II)were employed to perform multi-objective optimization on the structural parameter combinations of the BTLFC(size ratio r,bifurcation angle θ,fractal order D).The optimized BTLFC structure exhibited superior comprehensive performance,with specific energy absorption increased by 10.19%,peak crushing force reduced by 12.27%,and mass decreased by 11.79%compared to traditional honeycomb cores.The findings provide novel biomimetic design insights for developing high-performance energy absorption structures.
Keywords：Leaf vein structureBiomimetic designFinite elementEnergy absorptionMulti-objective optimization
Publication Date：2025-10-15
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：7( 124-130 )