GATE MT 2022 MT Q52: Fatigue

High cycle fatigue data for an alloy at various alternating stresses,

(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

MPa followed by (ii) 25000 cycles at

MPa and finally (iii) at

MPa. Assuming that Miner’s law is obeyed, the number of cycles to failure at the final applied stress of 500 MPa is __________.

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