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The endurance limit of an alloy at 1 x 107 cycles is found to be a = 70 MPa when tested at a load

 

The endurance limit of an alloy at 1 x 107 cycles is found to be a = 70 MPa when tested at a load ratio of R = 0.2. Calculate the endurance limit at a mean stress of zero. Take the ultimate tensile strength of the alloy as t = 580 MPa. Give your answer in MPa to 3 significant figures. Endurance limit: MPa

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