Question: (a) Compare the fatigue limits for polystyrene and the cast iron for which fatigue data are given in Problem 8.20. (b) Compare the fatigue strengths

(a) Compare the fatigue limits for polystyrene and the cast iron for which fatigue data are given in Problem 8.20.
(b) Compare the fatigue strengths at 106 cycles for poly(ethylene terephthalate) (PET) and red brass.

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