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1Final Design Review
Stephanie Moran, Ryan Rosario, Zachary Stauber, Bethany Tomerlin, Juan Carlos Ybarra
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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
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3Minimum Goals for Strain Sensor Prototype
Minimum Requirements:
MC
Text output of Strain vs. Resistance
Sensor
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4Ideal Goals for Prototype: Glove Design
Ideal Prototype:
MC
MC
Output:•Resistance vs. Strain
•Position of sensor
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•Thermoplastic Polyurethane Elastomers
•RTV polyurethanes
•RTV silicone rubbers
5Many polymers can serve as a possible insulating matrix for the strain sensors.
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6Electrons tunnel through the insulating matrix to nearby conductive carbon black particles.
Polymer matrix
Carbon black
particlee-
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7RTV polyurethanes vulcanize when polyols are added to isocyanate-terminated pre-polymers.
Addition of polyol
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8Current Processing Technique
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9Removal of Bubbles With Pasta Maker Succeeded
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10A Vacuum failed to Sufficiently Remove Bubbles
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11New Instron Testing Set-up Eliminates Torsion of Polymer
VoltageCurrent
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12Conductive Rubber Bands Product on the Market
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•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
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•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