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Julián Andrés Ortiz González Jaime Tupiassú Pinho de Castro Giancarlo Luis Gomez Gonzáles Marco Antonio Meggiolaro José Luiz de França Freire

Abstract

Redundant data obtained under quasi-constant {DeltaK, Kmax} loading conditions is used to verify if the effective stress intensity factor (SIF) range DeltaKeff DeltaKmax DeltaKop is indeed the fatigue crack driving force. The crack opening SIF Kop is measured along the entire crack path on DC(T) low carbon steel specimens by a series of strain gages bonded along the crack paths, by a strain gage bonded on their back faces, and by a digital image correlation technique. All such measurements showed a significant Kop decrease as the crack sizes increased, while the fatigue crack growth rates remained essentially constant both in the thin and thick specimens, a behavior that cannot be explained by DeltaKeff arguments.

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    How to Cite

    Ortiz González, J. A., Pinho de Castro, J. T., Gomez Gonzáles, G. L., Meggiolaro, M. A. and de França Freire, J. L. (2017) “On DIC measurements of DeltaKeff to verify if it is the FCG driving force”, Frattura ed Integrità Strutturale, 11(41), pp. Pages 227–235. doi: 10.3221/IGF-ESIS.41.31.

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