Describe stages in crack growth.
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Crack usually initiate at some point of stress concentration
--- common areas include scratches, fillets, threads, and dents.
Propagation occurs in two stages:
Stage-1:
Propagates very slowly along crystallographic planes of higher shear stress and may constitute either a large or small fraction of the fatigue life of a specimen.
Stage-2:
The crack growth rate increases and changes direction, moving perpendicular to the applied stress.
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