A machine components known stress level history is shown below: a. Using a 103 cycle strength of 100 ksi, and an endurance strength of 60 ksi, determine the accumulated damage. (i.e. What %age of the parts life has been consumed?) (10) What %age of the parts life remains? How much life remains (in days) if the above stress level history represents three days? (3) b. What if some surface treatment is applied that ends up reducing the endurance strength from 60 ksi to 50 ksi? What is the %age accumulated damage, and how much of the parts life remains? (6)

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Stress level (ksi) Cycles 4000 6000 10 000 25000 15 000 1500 Stress level (ksi) Cycles 4000 6000 10 000 25000 15 000 1500