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J integral - Abaqus

Line Spring elements errors

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Hello, All

***Problem ***

Failure pressure for Steam generator tube having 2 axial cracks. I am following one paper in that paper they found failure pressure by finding J and K values for line spring elements for different pressure. The pressure at which it approach material JIC(92N/mm) and KIC(65Mpa*sqrt(m)) value is considered as failure pressure or coalescence pressus

**Modelling** 

J integral estimation in ABAQUS

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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