Hello,

I have defined a simple model with rock properties and I defined initial geostatic stresses as a predefined field and then I ran the geostatic step to reach the static state  My question is, when I define an initial fracture in one of the elements using " *initial condition,type=enrichment", at the end of the geostatic step, stresses are different than the initial geostatic stresses I defined (screenshot below, file name 13) even though I haven't applied any load and when I add "*Boundary,phantom=node" stresses change again (screenshot 14) but when I don't define fracture, stresses at the end of geostatic step are same as the initial stresses (screenshot 12) which is expected. What causes this difference in stresses and should I use the new stresses in the formulas or the stresses that I defined initially? 

Your answers are appreciated

Abaqus ​​​​​​​​​​​​​​