Metallurgical Engineering > GATE 2022 > Fatigue
High cycle fatigue data for an alloy at various alternating stresses, σa (see figure) is given below.
A specimen of this alloy is subjected to multiple stress cycles sequentially in the following order: (i) first 5000 cycles at σa=400 MPa followed by (ii) 25000 cycles at σa=300 MPa and finally (iii) at σa=500 MPa. Assuming that Miner's law is obeyed, the number of cycles to failure at the final applied stress of 500 MPa is _______.
Correct : 250
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