圆锥形负刚度超材料吸能性能研究

Study on Energy Absorption Performances of Conical Negative Stiffness Metamaterials

由于负刚度超材料作为吸能材料具有可重复使用的特性,因此有必要对负刚度超材料的吸能性能和可重复使用性能进行深入研究.采用3D打印技术制备了所设计的负刚度超材料,通过反复加载实验研究了超材料在多稳态模式和单稳态模式下的吸能性能,并采用自然时效的方法研究了残余应力对超材料吸能性能的影响.结果表明,所设计超材料在反复加载时,随加载次数的增加,超材料的比吸能先下降后趋于稳定.在多稳态模式和单稳态模式下,采用自然时效方法都可以有效释放超材料中的残余应力,从而提高其反复吸能性能.

Since negative stiffness metamaterials are reusable as energy-absorbing materials,it is necessary to investigate the energy-absorbing performances and reusability of negative stiffness metamaterials.The designed negative stiffness metamaterial was prepared with the 3D printing technology,and the energy absorption performance of the metamaterial in the multi-stable mode and the mono-stable mode was investigated by repeated loading experiments.The effect of the residual stress on the energy absorption performance of the metamaterial was studied with the natural aging method.The results show that,the specific energy absorption of the designed metamaterial first decreases and then stabilizes with the increase of the number of loading times in the case of repeated loading.In both the multi-stable mode and the mono-stable mode,the natural aging method can effectively release the residual stresses in the metamaterial,thus improving its repeated energy absorption performance.