Question

A component made from the aluminium alloy whose S-N curve is shown below is subject to 8000 cycles at 120 MPa cyclic stress amplitude,followed by 125 cycles at 200 MPa, and 5 million cycles at 80 MPa.According to Miner's law, after how many further cycles would you expect the component to fail if it is subject to a cyclic stress amplitude of95 MPa?

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