1Final Design Review

Stephanie Moran, Ryan Rosario, Zachary Stauber, Bethany Tomerlin, Juan Carlos Ybarra

2Outline of Presentation

•Goals For Prototype

•Conductivity In Carbon Filled Elastomers

•Polymer Selection

•Processing Methods

•Improvements In Experimental Design

•How Our Proposed Device Compares to Existing Products

•Gantt Chart

3Minimum Goals for Strain Sensor Prototype

Minimum Requirements:

MC

Text output of Strain vs. Resistance

Sensor

4Ideal Goals for Prototype: Glove Design

Ideal Prototype:

MC

MC

Output:•Resistance vs. Strain

•Position of sensor

•Thermoplastic Polyurethane Elastomers

•RTV polyurethanes

•RTV silicone rubbers

5Many polymers can serve as a possible insulating matrix for the strain sensors.

6Electrons tunnel through the insulating matrix to nearby conductive carbon black particles.

Polymer matrix

Carbon black

particlee-

7RTV polyurethanes vulcanize when polyols are added to isocyanate-terminated pre-polymers.

Addition of polyol

8Current Processing Technique

9Removal of Bubbles With Pasta Maker Succeeded

10A Vacuum failed to Sufficiently Remove Bubbles

11New Instron Testing Set-up Eliminates Torsion of Polymer

VoltageCurrent

12Conductive Rubber Bands Product on the Market

•KLM Series reads strain up to 20%•Foil/ Resin based gauge

Foil gauges •elongations < 5%•Cheap •“art form” to properly place•electrical output needed

Comparison of our product to other Commercial Over the Shelf Strain Gauges

•Carbon Black $1.5325/ lb

Current Rubber $5.37/ lbretail

Relative Cost

• ~50 Strain gauges per pound of raw material

Materials LaberElectronics

A Preliminary Breakdown of the Cost of the Sense-OnStrain Gauge