Dear Ashish,

Thank you for your reply . I have another doubt -

  1. whether the element order is to be maintained as linear for vcct analysis.
  2. I am making the same material in both sides of crack , still I am getting same error message.
  3. Whether this pre mesh crack will work on curved surface.

I am attaching my model photo. here i am introducing pre mesh crack as edge crack at red and blue points. In case of red point both side materials are same. In case of blue , materials are different.