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US 2014/0272277 A1Published application
Constrained microlayer cellular material with high stiffness and damping
AssigneeHRL Laboratories, LLC
InventorsTobias A. Schaedler, Alan J. Jacobsen, William Carter, Geoffrey P. McKnight
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Abstract
Composite materials with high damping and high stiffness at relatively low density. These materials include three-dimensional structures of interconnected ligaments, which have multiple concentric layers alternating between stiff constraining layers and soft damping layers, so that bulk deformation of the structure results in high local shear strain and correspondingly high bulk damping.
Claims20
A method for forming a three-dimensional open-celled cellular structure, the method comprising:
- forming a three-dimensional open-celled cellular template;
- forming a first coating layer of a first substance on the three-dimensional template;
- forming a second coating layer of a second substance on the first coating layer;
- forming a third coating layer of a third substance on the second coating layer;
- and
- removing the three-dimensional template,
- the second substance being different from the first substance, and
- the second substance being different from the third substance.
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A structure comprising:
- a plurality of ligaments interconnected as a three-dimensional open-celled cellular structure, each of the plurality of ligaments comprising a plurality of layers;
- a first layer of the plurality of layers comprising a first substance;
- the first layer being directly between
- a second layer of the plurality of layers comprising a second substance and
- a third layer of the plurality of layers comprising a third substance,
- the first substance having a shear modulus
- less than one tenth the Young's modulus of the second substance, and
- less than one tenth the Young's modulus of the third substance.
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Dependencies are inferred from the claim text.