Compare the fatigue limits for polystyrene (Eioure 15.11) and the cast iron for which fatigue data are given in the table below: Stress Amplitude [MPa (ks)1 Cycles to Fallure 248 (36.0) 236 (34.2) 224 (32.5) 213 (30.9) 201 (29.1) 193 (28.0) 193 (28.0) 193 (28.0) 1 x 105 3 x 105 1 x 106 3 x 106 1 x 107 3 x 107 1 x 10 3 x 108 re the fatigue strengths at 10 cycles for poly(ethylene terephthalate) (PET, E oure 15.11) and 70Cu-302n (b) Compar brass (Eigure. B.21). polistyrene: MPa ductile cast iron: MPa poly(ethylene terephthalate (PET: MPa 70Cu-30Zn brass:
