R=3 thanks

The fatigue data for a ductile cast iron are given in Table 2 below. (40 marks) Iabie (a) Make an S-N plot (stress amplitude versus logarithm cycles to failure) using the data in Table 2 on a graph paper. (b) Suppose that a 25-mm diameter cylindrical rod made by this ductile cast iron is under a cyclic-tensile load. The tension fluctuates from 200N to 600N and the rod rotates at an average rotational velocity of (700+R) revolutions per minutes. R is the last two digits of your student ID number. Predict the maximum lifetime of the rod