Dynamic response and failure mechanism of double triangular truss core sandwich structure under low velocity impact

doi:10.19936/j.cnki.2096-8000.20240328.004

Abstract

Abstract: A nonlinear finite element simulation method was used to study the impact resistance of the double triangular truss core sandwich structure. A hemispherical impactor with a diameter of 16 mm was used to impact the nodes and substrate positions of the sandwich panel with different impact energies to study the failure mechanism and dynamic response of the truss core sandwich panel, as well as the influence law of each variable on the impact resistance of the sandwich panel. The results show that the main failure form of the double triangular truss core sandwich structure is the tensile rupture of the substrate of the panel, while the failure form of the core is influenced by its own structure and force mode, presenting mainly in the form of brittle collapse fracture and plastic deformation. The load-time curves show that the punch energy and impact location have a significant influence on the damage failure behavior of the sandwich panel. Under the same impact energy, the damage degree and load peak of sandwich panel at nodal impact are better than that of basal impact, and the impact resistance is more excellent; the energy absorption effect of nodal impact under high impact energy is better than that of basal impact, but the load change trend is increasingly similar.

Key words: nodal sandwich structure, finite element simulation, impact resistance, failure mechanism, dynamic response, composites

CLC Number:

TB332

YANG Sixin, CAO Zhongliang, GU Fuwei. Dynamic response and failure mechanism of double triangular truss core sandwich structure under low velocity impact[J]. COMPOSITES SCIENCE AND ENGINEERING, 2024, 0(3): 25-34.

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