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[Phys-l] crack propagation and stress concentration WRT bell jar implosion



A thread on tap-l is discussing (well, the members are) the recent scare (saved by an explosion shield) of one of the members by the implosion of a glass bell jar. I wish your opinions on the contribution of scratches.

Is a scratch a significant stress concentrator; is crack propagation cumulative, is pressure (vacuum) cycling important, and is the length of time under stress (vacuum) important?

bc