Superelastic Alloy Structural Geometry for Ultrahigh Mechanical Damping
AssigneeMassachusetts Institute of Technology
InventorsChristopher A. Schuh, Jose M. San Juan, Ying Chen
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Abstract
A mechanical structure is provided with a crystalline super alloy that is characterized by an average grain size and that exhibits a martensitic phase transformation resulting from a mechanical stress input greater than a characteristic first critical stress. A configuration of the superelastic alloy is provided with a geometric structural feature of the alloy that has an extent that is no greater than about 200 micrometers and that is no larger than the average grain size of the alloy. This geometric feature undergoes the martensitic transformation without intergranular fracture of the geometric feature.
Claims20
A mechanical structure comprising:
- a crystalline superelastic alloy characterized by an average grain size and exhibiting a martensitic phase transformation resulting from a mechanical stress input greater than a characteristic first critical stress;
- and
- a configuration of the superelastic alloy providing a geometric structural feature of the alloy having an extent that is no greater than about 200 micrometers and that is no larger than the average grain size of the alloy, the geometric feature undergoing the martensitic transformation without intergranular fracture of the geometric feature.
The structure of claim 20 wherein the fiber is characterized by a bamboo grain structure in which grains extend across the fiber diameter.
Dependencies are inferred from the claim text.