期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 3, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202005319
关键词
bandgaps; magnetic soft active materials; metamaterial materials; multifunctional materials; stimuli-responsive materials
类别
资金
- Air Force Office of Scientific Research grant [AFOSR-FA9550-19-1-0151]
- National Science Foundation (NSF) Career Award [CMMI-1943070]
- NSF [CMMI-1939543]
- Ohio State University Materials Research Seed Grant Program, an NSF-MRSEC grant [DMR-1420451]
The new magneto-mechanical metamaterial allows for great tunability through a novel concept of deformation mode branching. The architecture of this metamaterial employs hard-magnetic soft active materials, enabling two distinct actuation modes under opposite-direction magnetic fields.
Mechanical metamaterials are architected manmade materials that allow for unique behaviors not observed in nature, making them promising candidates for a wide range of applications. Existing metamaterials lack tunability as their properties can only be changed to a limited extent after the fabrication. Herein, a new magneto-mechanical metamaterial is presented that allows great tunability through a novel concept of deformation mode branching. The architecture of this new metamaterial employs an asymmetric joint design using hard-magnetic soft active materials that permits two distinct actuation modes (bending and folding) under opposite-direction magnetic fields. The subsequent application of mechanical compression leads to the deformation mode branching where the metamaterial architecture transforms into two distinctly different shapes, which exhibit very different deformations and enable great tunability in properties such as mechanical stiffness and acoustic bandgaps. Furthermore, this metamaterial design can be incorporated with magnetic shape memory polymers with global stiffness tunability, which also allows for the global shift of the acoustic behaviors. The combination of magnetic and mechanical actuations, as well as shape memory effects, impart wide tunable properties to a new paradigm of metamaterials.
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