1. Central crack loaded with stress.
(A) The stress intensity factor for a central line crack in an infinite plate is found to be
K=p(πa)^.5
where p is the pressure exerted along the crack line. (A) Does this formula imply a stable or an unstable crack propagation when p reaches the critical stress level? (B) Present an experiment to support your answer in (A). Specify your experiment in details.
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