3. A batch of aluminium alloy components was laboratory tested under applied cyclic stresses about a mean of zero. The c
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3. A batch of aluminium alloy components was laboratory tested under applied cyclic stresses about a mean of zero. The components failed under a stress range, Ao, of 350 MPa after 10 cycles; under a range of 250 MPa, the components failed after 10' cycles. Assuming that the fatigue behaviour of the alloy can be represented by: AO (NA) = C where a and C are material constants, find the number of cycles to failure, Nf, for a component subjected to a stress range of 100 MPa. -
3. Use simultaneous equations: Log(350) + aLog(10%) = Log(C) Log(250) + aLog(107) = Log(C) :: a = 0.073064 :. Log(C) = 2.909388 Then calculate Log(Nf) (for Ao= 100 MPa) = 12.446458 :. Ne = 2.795 x 102 cycles when Ao = 100 MPa