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US 2020/0047458 A1Published application
Wavy network structures dispersed in a hard phase
AssigneeUniversity of New Hampshire
InventorYaning LI
Life of this patent
Estimating the term…
Abstract
The present invention is directed at materials and methods for their formation having wavy network structures dispersed in a second and relatively harder phase. The materials can be designed to exhibit auxetic properties (e.g. a negative Poisson's ratio) in response to an application of force.
Claims17
A network structure comprising:
- three wavy segments that extend in three directions from a first connection location wherein said wavy segments have a Young's modulus value Ei and said wavy segments are dispersed in a second phase of material having a Young's modulus Eh where Eh>Ei;
- and
- said wavy segments are positioned between said first and a second connection location and at about a midpoint between said first and second connection locations said wavy segments change direction and define an angle 2θm wherein the value of θm is greater than zero and less than 90°.
A network structure comprising:
- three wavy segments that extend in three directions from a first connection location wherein said wavy segments have a Young's modulus value Ei and said wavy segments are dispersed in a second phase of material having a Young's modulus Eh where Eh>Ei;
- wherein said wavy structure is positioned between said first and a second connection location and at about a midpoint between said connection locations said wavy structure changes direction and defines an angle 2θm wherein the value of θm is greater than or equal to 5° and the value of Eh/ Ei is greater than or equal to 1×103.
A method for forming a network structure comprising:
- forming three wavy segments that extend in three directions from a first connection location wherein said wavy segments have a Young's modulus value Ei and said wavy segments are dispersed in a second phase of material having a Young's modulus Eh where Eh>Ei;
- and
- said wavy segments are positioned between said first and a second connection location and at about a midpoint between said first and second connection locations said wavy segments change direction and define an angle 2θm wherein the value of θm is greater than zero and less than 90°.
Dependencies are inferred from the claim text.