I have attached some pictures of my model. Basically, I have a square specimen (dimensions 2000x2000 micrometer) with a hole (d = 120 micro) in the center. There is a crack (a=10 micro) located on the right of the hole. The material is glass ceramic, E = 91 GPA.
My goal is find the stress required to propagate the crack. Right now, however, the crack won't grow. I am using VCCT and my fracture criterion is the critical energy release rate (I have attached a picture). What am I doing wrong?