1. The problem statement, all variables and given/known data Physical understanding about the variation of hoop stresses in a plate with a hole 2. Relevant equations I have been reading about the solution of stresses in solution of plate with a hole from here: http://www.fracturemechanics.org/hole.html . I’m unable to physically understand the following: How is that the hoop stresses become infinity at theta = + or -90? I’m unable to sense this physically? I understand that there is a hole there but at theta = 0, the hoop stresses are compressive (this also corresponds to the hole position since r = a). I’m unable to sense the two scenarios physically. That is: how the hoop stresses become infinity at r = a and theta = +90 or -90 and the hoop stresses become compressive at theta = 0? 3. The attempt at a solution The question is to do with physical understanding.