Document 7741002
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Transcript Document 7741002
Can You Heat Me
Now?
Brie Frame
Sandra Gonzalez
Angela Tong
Chenny Zhu
Department of Materials Science • 3.082 • Advisor: Hao Wang •
March 4, 2004
Outline of Presentation
Objective
Updated Design
Potential Materials
Proposed Schedule
Objective
Design and fabricate a heat therapy
device for lower back pain with a future
use for transdermal drug delivery.
Single Component vs. Hybrid
Portability
Low Cost
Modular
Temp.
Regulation
Compact
Long Heat
Reusability
Chemical
Electrical
Hybrid
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Components of Device
Battery
High Insulating Layer
Heating Core
Outer Covering
Body
Battery
Device Placement
Heating Device
Heating Core
Potential Materials
Tetradecanol
Ethylene Carbonate
2,6-Di-tert-butylphenol
Cis-Cyclohexane-1,2dicarboylic anydride
Benzylideneacetone
Sodium Acetate
Insulating Material
Potential Materials
COHRlastic Solid Silicone Rubber
Thermally Conductive R10404
Low Thermal Conductivity 0.0037W/mK
Very Thin
R10480
Low Thermal Conductivity
Flexible
Cotton
Low Thermal Conductivity 0.03 W/mK
Neoprene
Insulwrap Quilts from American
Acoustical Products
Battery
Sanyo Batteries
Lithium Polymer: UPF574199
high energy density both by volume and by weight, flat
and flexible
not as much total energy available per battery
Li-ion Rechargeable: UR18650H, UR18650F
highest energy densities of the fifteen batteries surveyed
less total energy than lithium polymer, round casing
Saft Batteries
Li-ion Rechargeable: MP176065 and others
highest total energy available per battery, flat casing
big and bulky, rigid casing, low energy density
Switch
Potential Switches
Polymer Thermal Switch
Polymer matrix with conductive particles interspersed
When cooled, matrix becomes compact, particles touch
and form electrically connected network
When heated, matrix expands, connected network breaks
Bi-metallic Switch
Two metals with different expansion coefficients laminated
together
When heated, one expands more than the other, which
causes it to bend and either open or close the circuit
Integrated Circuit – Programmable Thermostatic
Switch
Circuit where temperature setting can be controlled by
adding resistors
Wire Tensile Testing
Ni80Cr20
Ni60Cr40
High Resistance
Strong
Cross-sectional area =
1.26x10-3 sq. in.
Wire Tensile Results for Ni60-Cr40
Stre ss-Strain Curve for Ni60-Cr40 Wire
120000
Stress (psi)
100000
80000
60000
40000
20000
0
0
0.1
0.2
0.4
0.3
0.5
0.6
0.7
Strain
Ultimate force withstood: 135 pounds
Ultimate Tensile Strength (UTS): 107,432 psi
Elastic Modulus= (61,674-15,915) psi / (.1388-.1042) = 1,322.5 ksi
Total Elongation=1.9 in.
Wire Tensile Results for Ni80-Cr20
Stress-Strain NiCr 80:20
140000
120000
100000
Stress
80000
60000
40000
20000
0
0
0.1
0.2
0.3
0.4
0.5
Strain
Ultimate force withstood: 160 pounds
Ultimate Tensile Strength (UTS): 127,300 psi
Total Elongation=2.6 in.
0.6
0.7
0.8
0.9
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Proposed Schedule
Feb 2004
ID
Task Name
Start
2/1
1
Formal Design Review Presentation
2
Obtaining Materials
3/11/2004
3/11/2004
2/5/2004
3/18/2004
3
Wires
3/2/2004
3/4/2004
4
PCM
3/2/2004
3/11/2004
5
Thermal Switch
3/9/2004
3/11/2004
6
Polymer Gel
3/9/2004
3/11/2004
7
Insulating Material
3/9/2004
3/16/2004
8
Battery
3/9/2004
3/16/2004
9
Outside Material
3/9/2004
3/16/2004
Wire Coating
3/9/2004
3/16/2004
3/9/2004
3/18/2004
10
11
Processing
12
Polymer Gels
3/11/2004
3/18/2004
13
Wire Coating
3/11/2004
3/18/2004
3/2/2004
4/1/2004
14
Testing Materials
Mar 2004
Apr 2004
May 2004
Finish
15
Wire
3/2/2004
3/9/2004
16
PCM
3/4/2004
3/18/2004
17
Thermal Switch
3/16/2004
3/25/2004
18
Polymer Gel
3/18/2004
4/1/2004
3/18/2004
4/6/2004
19
Prototype Assembly
20
Initial Prototypes
4/6/2004
4/6/2004
21
Testing and Troubleshooting Prototype
4/6/2004
5/6/2004
22
Last Day of Lab Work
5/6/2004
5/6/2004
23
Final Presentation/Posters Due
5/13/2004
5/13/2004
2/8
2/15
2/22
2/29
3/7
3/14
3/21
3/28
4/4
4/11
4/18
4/25
5/2
5/9
5/16