The fatigue data for a ductile cast iron are given as follows (a) Make an S N plot (stress amplitude versus logarithm cycles to failure) using these data (b) What is the fatigue limit for this alloy (c) Determine fatigue lifetimes at stress amplitudes of 230MPa (33,500psi) and 175MPa (25,000psi) (d) Estimate fatigue strengths at 2 10 5 and 6 10 6 cycles Stress Amplitude MPa ksi) Cycles to Failure 248 (36 0) 1 x 105 236 (34 2) 3 x 105 224 (32 5) 1x 106 213 (30 9) 3 x 100 201 (29 1) 1x 107 193 (28 0) 3 x 107 1x 108 193 (28 0) 193 (28 0) 3 x 10

Question: The fatigue data for a ductile cast iron are given as follows: (a) Make an S?N plot (stress amplitude versus logarithm cycles to failure) using

The fatigue data for a ductile cast iron are given as follows:

Stress Amplitude [MPa ksi)] Cycles to Failure 248 (36.0) 1 x 105

(a) Make an S?N plot (stress amplitude versus logarithm cycles to failure) using these data.

(b) What is the fatigue limit for this alloy?

(d) Estimate fatigue strengths at 2 ? 10⁵ and 6 ? 10⁶ cycles.

Stress Amplitude [MPa ksi)] Cycles to Failure 248 (36.0) 1 x 105 236 (34.2) 3 x 105 224 (32.5) 1x 106 213 (30.9) 3 x 100 201 (29.1) 1x 107 193 (28.0) 3 x 107 1x 108 193 (28.0) 193 (28.0) 3 x 10

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