If you are interested in obtaining a free copy of the ABAQUS UMAT source code in FORTRAN for the Complete Gurson Model, please contact Prof. Zhiliang Zhang.
Manual for Computational Fracture Mechanics Exercises
Here you can download a manual prepared for guiding the compuatational exercises in the NTNU course - TMM4160 Fracture Mechanics. This manual covers the minimum you need to use ABAQUS to calculate the fracture mechanics parameters (K, J. CTOD).