Is it normal to not be able to get the failure index to reach a value of 1, even when the stresses in the lamina are high enough to satisfy the Hashin criterion equation? In fact, I have never been able to reach 1, only 0.9999.
For example, when I calculate the Hashin matrix tension failure index using the criterion equation and the stresses in the lamina, I get a damage variable value of 1.661 (which would indicate damage initiation), but ANSYS gives a maximum value of 0.747 (which would indicate no damage initiation). I am seeing a drop in fiber stresses immediately after that particular substep, leading me to believe that damage has occurred.
Is it possible that ANSYS has somehow scaled the damage variable output numbers such that they are appearing lower than what they really are?