Question: Exercise 6 The fatigue data for a ductile cast iron are given in the table below. Stress Amplitude (MPa) Cycles to failure 248 1*10 5

Exercise 6 The fatigue data for a ductile cast iron are given in the table below.

Stress Amplitude (MPa) Cycles to failure
248 1*105
236 3*105
224 1*106
213 3*106
201 1*107
193 3*107
193 1*108
193 3*108

a) (i) Create a Wlehr curve from the data. (ii) What is the fatigue limit for this alloy? (iii) Determine the fatigue life at 230 MPa and 175 MPa (iiii) Determine the fatigue strength of 2x105 and 6x106 cycles

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