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Instead of the stress intensity factor, the crack tip plastic strain range is proposed as a similitude parameter and as a basis for fatigue crack growth analysis. Quantitative analytical evaluation shows that an effective stress intensity that accounts for differences in crack tip plastic strain range can be rationally derived and used to account for the fatigue crack threshold, certain small crack behavior, and retardation.
fatigue crack growth, similitude, plastic strain range, crack growth analysis, retardation, threshold, small cracks
Struggler, Fracturesearch Inc., Columbus, OH