ESDU 76014 details a method for constructing a constant amplitude SN curve for a component from a knowledge of an SN curve obtained by testing specimens of the same material with a similar surface finish and under similar environmental conditions. The procedure corrects firstly for the influence of any stress raiser in the test specimen, including any plasticity effects, and then constructs a zero mean stress (although any value could be used) SN curve. That SN curve is then finally corrected for any relative size differences between the test specimen and the required component to which the constructed curve is to be applied. A comprehensive worked example illustrates the use of the method. Also included is a method for representing the stress-strain curve of a material by a two-constant equation over the complete range beyond the limit of proportionality.