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During a routine inspection, the low-alloy steel machine axle is found to contain a surface fatigue crack with a = 3.0 mm . If the

During a routine inspection, the low-alloy steel machine axle is found to contain a surface fatigue crack with a = 3.0 mm. If the fracture toughness of the steel is 45 MPa.m, what is the maximum stress that the axle may be subjected to without failing by brittle fracture? (Assume a numerical correction factor of Y = 1).

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