Hello,
Please let us know if the following are of any help:
https://www.dynamore.de/de/download/papers/2015-ls-dyna-europ/documents/sessions-e-5-8/non-linear-fracture-mechanics-in-ls-dyna-and-ls-prepost/view
J-integral in 3D:
https://www2.dynamore.se/public/jernberg/jintegral.gif
J-integral in 2D:
https://www2.dynamore.se/public/jernberg/jintegral2.gif
LSPP Help > Documentation

Thanks