Understanding of fatigue and fracture mechanics is essential when dealing with life estimation of structural parts subjected to fluctuating load environment. For example, safe life prediction of the aircraft and space components or turbine engines must be conducted to ensure the life adequacy of parts during service usage In many cases fracture properties of material are not available because of 1) cost associated with generating fatigue and fracture data, 2) Inability to conduct tests because of time limitation and deadline set forth by the customers, and 3) Lack of analytical tool to conduct a comprehensive crack tip stress analysis.
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