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A steel component was loaded at 300MPa for 500 cycles, then at 200 MPa it is run for 100 Cycle and rest of the life it is loaded 100 MPa. Find the total number of cycles the component has run before failing?

A steel component was loaded at 300MPa for 500 cycles, then at 200 MPa it is run for 100 Cycle and rest of the life it is loaded 100 MPa. Find the total number of cycles the component has run before failing? Correct Answer 1350

Here, -> Number cycles to failure at 300 MPa = 1000 -> Number of cycles run at 300 MPa = 500 -> Number cycles to failure at 200 MPa = 2000 -> Number of cycles run at 200 MPa = 100 -> Number cycles to failure at 100 MPa = 3000 -> Number of cycles run at 100 MPa =? According to minor’s rule: n1/N1+n2/N2+n3/N3+………………..+nk/Nk=1 -> 500/1000+100/2000+x/3000=1 -> 1/2+1/20+X/3000=1 -> 1-(11/20)*3000=x -> (9/20)*3000=x -> 9*150=x -> x=1350.

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