Ansys 14.5 workbench has fracture module ,which evaluates J-integral and SIF directly.Under solution in fracture tool you will find J-integral option just evaluate it for your crack.This Pdf may be helpful.In case you don't get it ,let me know I would happy to tell you the exact procedure
ok, thank you... can you tell me how to create two crack surfaces in already existing model in ansys workbench ..... it would be great if you share one ansys file with quarter circular corner crack in a plate (3d model)... i wanted to know how to create crack surfaces that will open up after solving the model...