Paris Equation in FCG prediction model

Hi everyone,

As we know obviously Dk in paris equation is an applied value for stress intensity range. we can either measure or calculate it according to fracture mechanics principle depends on geometry, crack length, etc . also we know that this equation can not support VAL conditions. now the question is if we make a change in stress/strain amplitude,besides we use a parameter to accumulate damage such as (Smith W-Topper parameter)to interlink between fatigue and fracture is it possible modify Dk in paris equation in way that corrected value can support Constant amplitude loading block which each block has a constant amplitude?

if you have idea about this i am very eager to hear you and discuss about that.

Best Regards