Numerical simulations on the dynamic response of bionic-turtle-shell hierarchical sandwichstructures

doi:10.19936/j.cnki.2096-8000.20260728.001

Abstract

Abstract: To improve the protective performance of sports helmets against low-velocity concentrated impact loads, abionic-turtle-shellhierarchical sandwichstructure (BHSS) was designed in this paper. Numerical simulations were adopted to explore the dynamic response law of BHSS under impact loads, and the effects of carbon fiber lay-up angles, rubber buffer layer thickness, TPMS cell configurations and wall thickness on the punch acceleration response and structural energy absorption characteristics were systematically analyzed. The results show that under the action of 73.98 J impact energy, the dynamic process of punch penetrating BHSS can be divided into five stages: elastic deformation, damage initiation, damage aggravation, stiffness strengthening and rebound. The TPMS porous core layer is the core energy-absorbing component of BHSS, with an energy absorption ratio of 63.76% and an overall energy absorption peak value of 63.77 J for the structure. The carbon fiber lay-up angles of cross-ply, angle-ply and quasi-isotropic ply have a weak effect on the energy absorption peak value of BHSS. The rubber buffer layer can effectively reduce the peak impact acceleration, but with an obvious marginal effect. The BHSS with P-type cell configuration exhibits the optimal comprehensive buffering and energy-absorbing effect, while increasing the cell wall thickness will lead to a significant rise in the peak punch acceleration.

Key words: biomimetic sandwich structure, low-velocity impact, dynamic response, structural parameters

CLC Number:

TB332

ZHANG Xiaogang, CUI Di, ZHANG Hao, SHA Yong. Numerical simulations on the dynamic response of bionic-turtle-shell hierarchical sandwichstructures[J]. COMPOSITES SCIENCE AND ENGINEERING, 2026, 0(7): 1-11.

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