Experimental and Theoretical Analyses of the Load Sequence Effects on Fatigue Crack Growth Resistance
Final rept. 1 Jul 2001-30 Sep 2004
WESTERN MICHIGAN UNIV KALAMAZOO
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Modeling of the fatigue crack propagation based on damage accumulation process ahead of the crack tip has been developed, which utilizes stress and strain distribution ahead of the crack tip, estimated using Rice and elastic solutions. The methodology is based on the use of both Kmax and DK as contributing parameters to the driving force and damage accumulation. Weight function approach has been adopted to determine the Kres profile. Load interaction and overload effects have been modeled by the effect of Kres on the Kmax and DK. The predictions of the present approach have been compared to experimental data and reasonable agreement has been found.