On DIC measurements of Keff to verify if it is the FCG driving force

Redundant data obtained under quasi-constant { delta K, Kmax} loading conditions is used to verify if the effective stress intensity factor (SIF) range delta Keff delta Kmax delta Kop is indeed the fatigue crack driving force. The crack opening SIF Kop is measured along the entire crack path on DC(T...

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Bibliographic Details
Published in:Frattura ed integritá strutturale 2017-07, Vol.11 (41), p.227-235
Main Authors: Jaime Tupiassú Pinho de Castro, Giancarlo Luis Gomez Gonzáles, Marco Antonio Meggiolaro, José Luiz de França Freire
Format: Article
Language:English
Subjects:
delta Keff limitations
Fatigue crack driving forces
opening load measurements
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Summary:Redundant data obtained under quasi-constant { delta K, Kmax} loading conditions is used to verify if the effective stress intensity factor (SIF) range delta Keff delta Kmax delta Kop 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 delta Keff arguments.
ISSN:1971-8993
1971-8993
DOI:10.3221/IGF-ESIS.41.31