Abstract:
The deformation behavior and energy absorption characteristics of multilayer nested internal concave hexagonal monoclonal structures and tandem structures with different angles, spacing and connection modes are analyzed by using quasi-static uniaxial compression experiments, cyclic compression experiments and finite element numerical simulations. It is shown that the multilayer nested structure undergoes more shear deformation, and the stress distribution range is small and low, which is mostly concentrated in the diagonal bar connection; the monoclonal structure connected by the alternating mode with larger angle and smaller spacing has longer plateau period; the specimen with α=65° has better energy absorption and the isotropic connection and increasing spacing help to improve the energy absorption; the angle and spacing have the same effect on the plateau period of the tandem structure as that of the monoclonal structure, while the connection mode has the opposite effect; the angle and spacing have the same effect on the plateau period as the monoclonal structure, while the connection mode has the opposite effect. The effects of angle and spacing on the plateau period of the tandem structure are the same as those of the single-cell structure, while those of the connection mode are opposite; the increase of angle and spacing, and the change of the connection mode have a positive feedback with the energy absorption; the specimens are prone to delamination and plastic fracture under cyclic compression experiments, which are mostly appeared after the second cycle, and are accompanied by the stress softening and energy dissipation behaviors, and the effects are aggravated with the increase of the number of cycles.
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