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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a

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me yeah

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