Abstract
Environment-induced crack growth generally progresses through several stages prior to component failure. Crack initiation, short crack growth, and stage I growth are early stages in crack development that are summarized in this paper. The implications of these stages on component reliability derive from the extended time that the crack exists in the early stages because crack velocity is low. The duration of the early stages provides a greater opportunity for corrective action if the short cracks can be detected. Several important factors about the value of understanding short crack behavior include: (1) component life prediction requires a knowledge of the total life cycle of the crack including the early stages, (2) greater reliability is possible if the transition between short and long crack behavior is known since component life after this transition is short, and (3) remedial actions are often more effective for short than long cracks.
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