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Applications of Fracture Mechanics to Crack Growth at Notches S S l l 2c 2a L* L*: Transitional crack length Example: 2c = 5 mm, L* = 0.25 mm 2c = 25 mm,

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Presentation on theme: "Applications of Fracture Mechanics to Crack Growth at Notches S S l l 2c 2a L* L*: Transitional crack length Example: 2c = 5 mm, L* = 0.25 mm 2c = 25 mm,"— Presentation transcript:

1 Applications of Fracture Mechanics to Crack Growth at Notches S S l l 2c 2a L* L*: Transitional crack length Example: 2c = 5 mm, L* = 0.25 mm 2c = 25 mm, L* = 1.21 mm Numerical Solution: Newman 1971 For crack length l ≥ 10% c: crack effective length is from tip to tip!!! (including notch)

2 Variación de la tensión con la distancia: Para r = 1.25 ro: Kt cae de 3 ->2

3 Consequences: For relatively small (5-10 % notch size) cracks at a hole or at a notch, the stress intensity factor K is approximately the same as for a much larger crack with a length that includes the hole diameter / notch depth. plane window Reading: Fatige and the Comet Airplane (taken from S. Suresh, Fatigue of Materials)


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