Prepared by Af'6-3~~~o

A r eview of current lifetime prediction technology for structural components subjected to cyclic loads was performed. The central objective was to report the current state of fracture mechanics-based analytical tools f or modeling and forecasting subcritical fatigue crack growth in structures. Of special interest was the ability to apply these tools to practical engineering problems. The survey included publ ished 1 iterature and numerous discussions with experts in the field of fracture mechanics life technology. One of the key points is that f racture mechanics analyses of crack growth often involve consideration of fatigue and fracture under complex envi ronmental and mechanical conditions. Therefore, inaccuracies in predicting component 1

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