Dual-modulus 3D printing technology for magnetorheological Metamaterials-Part II: Negative regulation theory and application

Metamaterials are artificially structured periodic materials that have remarkable property of wave attenuation in bandgaps. However, metamaterials with adjustable and low-frequency bandgap are still challenge in traditional method. In this work, a novel magnetorheological metamaterial (MRM) with negative regulation and low -frequency bandgaps was fabricated by dual-modulus 3D printing technology. The bandgaps of negative regulation MRM were analyzed theoretically by using the mass-spring model. As a result, the starting frequency of bandgap reduced by 37.6% and ending frequency increased by 47.8% under external magnetic field. Moreover, the propagation characteristics of longitudinal wave in negative regulation MRM were also studied and the results indicated that the stiffnesses were magnetic-related, and the bandgap can be tuned substantially under external magnetic field. This work presented a negative regulation MRM that the bandgap was broadened and moved to lower frequency under the external magnetic field, showing a great potential in the field of vibration isolation.

Automated summary

The article introduces a magnetorheological metamaterial (MRM) with negative regulation and low-frequency bandgaps fabricated using dual-modulus 3D printing technology. Theoretical analysis and experimental results show that the bandgaps of this metamaterial can be adjusted under an external magnetic field, making it potentially applicable in the field of vibration isolation.