Q-3 The following creep data were taken on an aluminum alloy at 400°C (750°F) and a constant stress of 25 MPa (3660 psi). Plot the data as strain versus time, then determine the steady-state or minimum creep rate. Time Time (min) Strain (min) Strain 0.00 18 0.82 2 0.22 20 0.88 4 0.34 22 0.95 6. 0.41 24 1.03 8 0.48 26 1.12 10 0.55 28 1.22 1.36 1.53 12 0.62 30 14 0.68 32 16 0.75 34 1.77
Q-3 The following creep data were taken on an aluminum alloy at 400°C (750°F) and a constant stress of 25 MPa (3660 psi). Plot the data as strain versus time, then determine the steady-state or minimum creep rate. Time Time (min) Strain (min) Strain 0.00 18 0.82 2 0.22 20 0.88 4 0.34 22 0.95 6. 0.41 24 1.03 8 0.48 26 1.12 10 0.55 28 1.22 1.36 1.53 12 0.62 30 14 0.68 32 16 0.75 34 1.77
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5th digit is 0.Thank you.
Transcribed Image Text:Q-3 The following creep data were taken on an aluminum alloy at 400°C (750°F)
and a constant stress of 25 MPa (3660 psi). Plot the data as strain versus time, then
determine the steady-state or minimum creep rate.
Time
Time
(min)
Strain
(min)
Strain
0.00
18
0.82
2
0.22
20
0.88
4
0.34
22
0.95
0.41
24
1.03
8
0.48
26
1.12
10
0.55
28
1.22
12
0.62
30
1.36
14
0.68
32
1.53
16
0.75
34
1.77
Q-4 Two separate creep experiments are running on polycrystalline Ni, one at
527°C and the other at 532°C. You observe that dɛ/dt increases by a factor of 1.O
for the sample tested at the higher temperature. What is the activation energy Q
for this creep mechanism? (o is the 5th digit of your student number, from the left)
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