Question

Problem#2: (20 pts) A cantilever beam undergoes following fatigue load conditions: a fully reversed first cycle with maximum and minimum bending stress at 47 and 47 kpsi respectively for 5000 cycles; a fully reversed second cycle with maximum and minimum bending stress at 40 and -40 kpsi respectively for 65000 cycles; a fully reversed third cycle with maximum and minimum bending stress at 33 and -33 kpsi. How many cycles of operation can be expected at this stress level? For the bea m, Sut 75 kpsi, f 0.9, and has a fully corrected endurance strength of Se 31 kpsi. Use the following methods for calculations. (a) Miner's method. (b) Manson's method

Answer 1