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28. Aluminum oxide has a plane strain fracture toughness (KIC) of 0.7MPam1/2. If a tensile stress of 100MPa is applied to a cylinder of aluminum
28. Aluminum oxide has a plane strain fracture toughness (KIC) of 0.7MPam1/2. If a tensile stress of 100MPa is applied to a cylinder of aluminum oxide (along its axis), calculate the smallest surface crack length needed to initiate fracture. Assume Y=
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