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