Question: An Al2O3 part contains both internal cracks with a maximum length of 0.075 mm, and external cracks with a maximum length of 0.05 mm. At

An Al2O3 part contains both internal cracks with a maximum length of 0.075 mm, and external cracks with a maximum length of 0.05 mm. At what applied stress will the internal cracks begin to propagate? At what applied stress will the external cracks begin to propagate? The fracture toughness KIC = 1.76 MPa x m^1/2, Y=1

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