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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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
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delta Keff limitations
Fatigue crack driving forces
opening load measurements
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container_title Frattura ed integritá strutturale
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creator Jaime Tupiassú Pinho de Castro
Giancarlo Luis Gomez Gonzáles
Marco Antonio Meggiolaro
José Luiz de França Freire
description 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.
doi_str_mv 10.3221/IGF-ESIS.41.31
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1971-8993
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subjects delta Keff limitations
Fatigue crack driving forces
opening load measurements
title On DIC measurements of Keff to verify if it is the FCG driving force
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