(1) A steel component is subjected to a reversed cyclic loading of 100 cycles/day over a period of time in which + 160 N/mm? is applied for 200 cycles, ‡ 140 N/mm2 is applied for 200 cycles and + 100 N/mm2 is applied for 600 cycles. If the fatigue life of the material at each of these stress levels is 104, 105, and 2 × 105 cycles, respectively, estimate the life of the component using Miner's law.
(2) An infinite steel plate has a fracture toughness of 3,320 N/mm3/2 and contains a 4 mm long crack. Calculate the maximum allowable design stress that could be applied around the boundary of the plate.
1 A Steel Component Is Subjected To A Reversed Cyclic Loading Of 100 Cycles Day Over A Period Of Time In Which 160 N 1 (32.49 KiB) Viewed 22 times
Question 8 (10 points, 5 points each) (1) A steel component is subjected to a reversed cyclic loading of 100 cycles/day over a period. of time in which ± 160 N/mm² is applied for 200 cycles, ± 140 N/mm2 is applied for 200 cycles and ± 100 N/mm2 is applied for 600 cycles. If the fatigue life of the material at each of these stress levels is 104, 105, and 2 x 105 cycles, respectively, estimate the life of the component using Miner's law. (2) An infinite steel plate has a fracture toughness of 3,320 N/mm³/2 and contains a 4 mm long crack. Calculate the maximum allowable design stress that could be applied around the boundary of the plate.
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