The following creep data were taken on an aluminum alloy at 480°C (900°F) and a constant stress of 2.75 MPa (400 psi). Plot the data as strain versus time, then determine the steady-state or minimum creep rate. Note: The initial and instantaneous strain is not included.
Time (min) | Strain | Time (min) | Strain |
0 | 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 |
12 | 0.62 | 30 | 1.36 |
14 | 0.68 | 32 | 1.53 |
16 | 0.75 | 34 | 1.77 |
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