Hyperelastic shape setting devices and fabrication methods
a technology of shape setting device and hyperelastic material, which is applied in the field of mechanical devices, can solve the problems of not being thermodynamically stable, the typical single crystal of hyperelastic wire cannot be used in the and the typical shape-setting process of tini-based wire cannot work for the fabrication of hyperelastic materials. , to achieve the effect of rapid cooling of the wire and loss of strength
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
Problems solved by technology
Method used
Image
Examples
example of one embodiment
A 1 mm diameter CuAlNi straight hyperelastic wire having a transition temperature at +10° C. was held in a curved shape with two pairs of pliers while being placed in an oxy-acetylene flame for approximately 3 seconds. The wire stiffened and straightened as it was heated, then softened and bent to a radius of about 5 mm. It was rapidly cooled by immersion in a pan of room-temperature salt water. After this procedure the wire retained a curvature of about 5 mm under no external stress, and returned to this shape after being straightened. This degree of curvature corresponds to a strain of approximately 10%, which compares favorably with the hyperelastic properties of the untreated wire, but with an altered shape.
Device Embodiments of the Invention
One application is as a flexure to replace hinges in eyeglasses. A strip of CuAlNi may be shape-set so that it is bent at a right angle. One end is attached to the frame; the other is attached to the temple piece of the glasses. A cam or...
example
Dental Arches
In this example, a dental archwire may be formed from a single-crystal SMA material (e.g., CuAlNi). The wire is heated by Joule heating, either as an electrical pulse or as a continuous electrical current, AC or DC, to annealing temperature. Typical currents are from 10 to 30 amperes. Voltage applied to the wire ends is typically 1 to 3 volts.
While it is at annealing temperature, the wire is quickly (less than 0.5 seconds) wrapped about a mandrel having the desired arch shape, and then plunged into a quenching bath. The sequence of heating, forcing the shape, and cooling may take less than a second.
In a first exemplary embodiment, an apparatus is used that consists of a variable voltage transformer, clamps or tubes that hold the wire ends in contact with the output (low-voltage) electrodes of the transformer, and a plunger with a U-shaped concavo-convex metal (copper) mandrel. This apparatus is illustrated in FIG. 4.
In FIG. 4, the apparatus for shape-setting hyp...
PUM
| Property | Measurement | Unit |
|---|---|---|
| diameter | aaaaa | aaaaa |
| length | aaaaa | aaaaa |
| length | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More 
PatSnap Eureka turns technology decisions into work you can execute. Powered by our Innovation Knowledge Graph, it runs expert workflows across engineering, life sciences, materials and intellectual property. Get your review-ready output in minutes.
