I'm trying to understand why I am seeing cracks around bolt holes in a polycarbonate part that is made out of 1/8" thick sheet. I understand that PC is subject to environmental stress cracking, which involves chemicals accelerating small micro cracks under tension. What I'm struggling with is whether a clamping force of a fastener will result in hoop stress around the bolt hole. I thought this was a simple phenomenon, but I can't find any information on it so I'm starting to doubt my intuition. Does a clamping or compression force of a fastener going through the hole impart a resulting hoop stress around that hole? Thanks in advance.
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