ESDU 76014:2013

ESDU 76014 details a method for constructing a constant
amplitude S – N curve for a component from a knowledge of
an S – N 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) S – N curve. That S –
N 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.