Journal
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
Volume 94, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.euromechsol.2022.104599
Keywords
Metastructure; Sandwich meta-panel; Analytical solution; Explosion resistance
Categories
Funding
- National Natural Science Foundation of China [11972184, U20A20286]
- China National Key Laboratory Founda-tion of Science and Technology on Materials under Shock and Impact [6142902200203]
- Natural Science Foundation of Jiangsu Province of China [BK20201286]
- Science and Technology Project of Jiangsu Province of China [BE2020716]
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Metamaterials and metastructures have an attenuation effect on blast load. This research focuses on the displacement attenuation effect of a composite meta-panel with embedded resonators in the core. The calculation model is obtained through equivalence and simplification, and the analytical solution for the displacement is solved. Finite element analysis confirms the theoretical results. It is discovered that the resonators in the meta-panel account for nearly half of the total energy. By modifying resonator parameters, the displacement of the meta-panel can be reduced to 60% or less compared to an ordinary sandwich panel of equal mass. Additionally, adding a viscous damping term further attenuates the peak displacement of the meta-panel when considering the damping of both the sandwich panel and the resonator. This research provides a theoretical basis for the explosion resistance application of locally resonant metamaterial sandwich panels.
Metamaterials and metastructures have attenuation effect on blast load. Instead of the blast wave attenuation, this research analyzed the displacement attenuation effect of a composite meta-panel with resonators embedded in the core under blast load. The calculation model of the meta-panel is obtained by equivalence and simplification, and then the analytical solution of the displacement of the meta-panel under blast load is solved. The finite element analysis is carried out and is in good agreement with the theory. It is found that the energy of the resonators in the meta-panel account for nearly half of the total energy. Compared with ordinary sandwich panel of equal mass, the displacement of meta-panel can be reduced to 60% or less by modifying resonator parameters. Adding the viscous damping term to the vibration equation, the peak displacement of the meta-panel will be further attenuated when the damping of the sandwich panel and the resonator are both considered. This research provides a theoretical basis for the explosion resistance application of locally resonant metamaterial sandwich panels.
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