Crack front and stress intensity factor

I am trying to obtain the stress intensity factor of an semieliptical crack ( I want to recreate the situation as it is shown in the image attached. The loading conditions are simple, is subjected to an internal pressure and a rigid indenter is fixed. I want to know if it is possible to obtain the stress intensity factor of the crack front.

I know the values of a and b but I don't know how to create the crack and obtain the value of the stress intensity facor with this configuration

Thank you very much

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