Dear all,
I am a Ph.D student. I am trying to calculate the value of the j-integral for a 3D penny shaped crack embeddee in a continuum linear elastic solid using ABAQUS.
the first difficulty that I have met is that j-integral values are negative forr some nodes along the crack front.
I am pretty sure that the value of the normal to the crack front that I have used is correct.
Do you know some other reason for that?
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