| Summary: | Mechanical Metamaterials are a novel category of engineered materials that
feature extraordinary mechanical properties not commonly found in traditional
materials. These specially engineered materials do not derive their unique properties
from the composition of the base material, but rather from the internal geometry of the
metamaterial itself.
In this report, a novel second-order hierarchical Mechanical Metamaterial,
constructed from a conventional Octet-truss lattice with 3D Chiral lattice structure
embedded within the trusses, is proposed as a space filling lattice, which possesses
both superior mechanical properties and tailorable passive damping characterises. The
addition of the 3D Chiral lattices would introduce laterally self-rotating elements into
the Octet-truss lattice, which would disrupt the transmission of vibrations through the
lattice by transforming the longitudinal waves to lateral ones, achieving a vibration
damping effect.
The efficacies of the mechanical properties and the frequency response
characterizes of the proposed novel Mechanical Metamaterial will be evaluated and
analyzed through the Finite Element Method as well as through experimental means.
Laser Powder Bed Fusion Additive Manufacturing was employed to fabricate the
various configuration of novel Mechanical Metamaterials evaluated to validate the
results obtained from the Finite Element Analysis.
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