Question

Calculate the number of cycles to failure (Nf) of an aluminum alloy exposed to reverse tensile-compressive loading (N) with a stress amplitude of 150MPa.   A = 2x10^-12.   n = 2.5m.

If initially the length (ao) of the largest crack is 0.75mm and the fracture toughness (Kc) = 35MPA m1/2.   

Answer 1