The fatigue data for a brass alloy are given as

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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