The fatigue data for a brass alloy are given as follows:
Stress Amplitude (MPa) | Cycles to Failure |
170 | 3.7 × 104 |
148 | 1.0 × 105 |
130 | 3.0 × 105 |
114 | 1.0 × 106 |
92 | 1.0 × 107 |
80 | 1.0 × 108 |
74 | 1.0 × 109 |
(a) Make an S–N plot (stress amplitude versus logarithm of cycles to failure) using these data.
(b) Determine the fatigue strength at 4 × 106 cycles.
(c) Determine the fatigue life for 120 MPa.
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