Crack Growth and Fracture Mechanics

When the material behavior is britde rather than ductile, the mechanics of the failure process are much different. Instead of the slow coalescence of voids associated with ductile rupture, britde fracture proceeds by the high-velocity propagation of a crack across the loaded member. If the material behavior is clearly britde, fracture may be predicted with reasonable accuracy through use of the maximum normal stress theory of failure. Thus failure is predicted to occur in the multi-axial state of stress when the maximum principal normal stress becomes equal to or exceeds the maximum normal stress at the time of failure in a simple uniaxial stress test using a specimen of the sane material.

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