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Fatigue Failure (Fatigue failure typically occur in three stages: (A tiny…
Fatigue Failure
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Griffith criteria
the propagation of cracks in plastic materials, as a combination of the release of elastic deformation energy and the increase of surface energy as a result of the appearance of new surfaces on the faces of the crack, from a critical tension.
two criteria
A) the propagation of cracks in plastic materials, as a combination of the release of elastic deformation energy and the increase of surface energy as a result of the appearance of new surfaces on the faces of the crack, from a critical tension.
A relationship is obtained between the fracture tension and the crack size that has been repeatedly tested in fragile materials.
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Fracture toughness
Measures the ability of a material containing a flaw to withstand an applied load. Note that this does not require a high strain rate (impact). A typical fracture toughness test may be performed by applying a tensile stress to a specimen prepared with a flow of known size and geometry. Fracture toughness depends on the thickness of the sample: As thickness increases, fracture toughness (Kc) decreases to a constant value.
Kc = K required for a crack to propagate
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