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US 9,217,084 B2Granted
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.
Claims21
A method for forming a three-dimensional open-celled cellular structure, the method comprising:
- forming a three-dimensional open-celled cellular template;
- forming a second coating layer of a second substance on the three-dimensional template;
- forming a first coating layer of a first substance on the second coating layer;
- forming a third coating layer of a third substance on the first coating layer;
- and
- removing the three-dimensional template,
- 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.
6 more elements
Dependencies are inferred from the claim text.