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A machine part will be cycled at ±350 MPa for 5 (103) cycles. Then the loading will be changed to ±260 MPa for 5 (104) cycles. Finally, the load will be changed to ±225 MPa. How many cycles of operation can be expected at this final stress level? For the part, S = 530 MPa, f = 0.9, and has a fully corrected endurance strength of Se = 210 MPa.

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Answer:

a) The number of cycles of operation at 225 MPa is 184,100 cycles

b) The number of cycles of operation at 225 MPa is 33,600 cycles

Explanation:

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