Extract stress intensity factor from J-Integral in non linear geometric analsyis

[ABD01]

Hi
Setting the geometric non-linearity option on, the calculated SIFs are not accurate (Abaqus warning)as agreed they are specifically valid for a linear elastic material.
In such an analysis case when the geometric noo-linearity is considered (elastic material, so far) the J integral can be calculated. Is it possible to estimate the SIFs (K1,K11,K111)from J-Integral in nonlinear geometry? if so, how could use Abaqus input/output files, please?

Thanks

 

[Mustaine3]

I've already told you, that the K-factors are not valid in nonlinear situations. So you can't convert a J-integral to K-factors in such cases.

 

[ABD01]

Mustaine3
Thanks for your comment
I thought there is a way to compare the linear & non-linear K-factor.
However, you still can see the concept of nonlinear SIF is used with non-linear material
Link