The negative stiffness metastructures provide a novel design strategy for reusable protective devices with the non-damage buckling energy dissipation mechanisms.However,the weak cushioning capacity and the measly overloading protection restrict the practical applications.To enhance the energy dissipation and maxi-mum allowable deformation,a negative stiffness torsion metastructure was developed with substructures inclu-ding buckling hinged beams and inclined beams.Through introduction of compression-torsion coupling effects,the stress concentration caused by overload can be alleviated.Based on a series model for the negative stiffness torsion element,a strategy to control the mechanical properties was proposed through design of the matching relations of stiffnesses.Snap-through behaviors and hysteresis phenomena can be obtained on the non-overlap-ping loading and unloading curves,to greatly improve the energy dissipation capacity.The optimization of geo-metric parameters and stiffness relations increases the maximum equivalent compressive strain of the negative stiffness torsion metastructure by 71%.Additionally,compared to the traditional buckling beam metastructures with the same number of layers,the negative stiffness torsion metastructure can double in the energy dissipa-tion capacity.
维普
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