mega lab final
TRANSCRIPT
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MEGA LAB PROPOSAL
Stephanie Nystrom
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TEST PIECE: CIRCUIT BREAKER
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Made of three different materials:
• Copper base• Silver-Tungsten Contact
(graphite)• Galvanized Steel
TEST PIECE: CIRCUIT BREAKER
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Three Material Identification (Resistivity)
Three Material Thicknesses
Matrix Structure-Homogeneity of the PM Contact
Join Integrity-Lack of Fusion
OBJECTIVES
Three Material Identification (Resistivity)
Copper Thickness
Change in Microstructure of the Steel due to Heat Damage
Theory
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%IACS Calibration: 1st try
17, 35, 37• Copper: NA• Steel: 29.035-30.826
• 30.42• PM: 34.47-34.53
MATERIAL ID: %IACS
%IACS Calibration: 2nd try
17, 37, 60• Copper: 63.8-70.29
• 69.57• Steel: -5.01• PM: 56.46Tungsten: 30-31.4
Graphite: 0.22Silver: 105.00-6.00 (%18 Ni))
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MATERIAL PROPERTIES
Copper Steel Ag/W PM%IACS 69.57% ¿30.42%? 34.47%Gain 15 dB 15 dB 15 dBR 1.097 [V] 0.022 [V] 1.135 [V]X -1.734 [V] 2.212 [V] 1.531 [V]θ -57.68° 89.43° 53.45°Z 2.052 2.212 1.906σ 40.351
[MS/m]17.644 [MS/m]
19.993 [MS/m]
Ω [Ωm] 2.478x10^-8
5.668x10^-8
5.002x10^-8
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Ultrasonic
Calibration Blocks
Calibrate machine: 4682 m/s
Calipers: 2.01mm
UT: 2.01-2.03mm
COPPER THICKNESS
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PM THICKNESS & MICROSTRUCTURE
??? Or $$$
A bit big…
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Heat Damage->Microstructure
Heat Gun-> Heat, not deform
MICRO STR U CTUR E:HEAT DAMAGE
Fried
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Before Heat Damaged
X: -9.0102 V
Y: 14.2993 V
COPPER
After Heat Damaged
X: -9.1158 V
Y: 14.4780 V
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Before Heat Damage
X: -.7324 V
Y: -14.8754 V
GALVANIZED STEEL
After Heat Damaged
X: -1.2922 V
Y: -14.8754 V
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By Heating the Steel:• Decreased
Resistivity• -.5598
• Increased Conductivity
• Annealing
Example: Circuit Overload
GALVANIZED STEEL
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Measured Thickness: 1.65mm
UT: Time-.23μs
Sound Velocity= distance/time=
1.65mm/.23μs=7.174 mm/μs
SOU ND VELO CITY:TU NGSTEN/S ILVER
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INTERFACE??? THEORY
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QUESTIONS?