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Relation between crack growth behaviour and crack front morphology under hold-time conditions in DA Inconel 718

Fessler, Emmanuel and Andrieu, Eric and Bonnand, Vincent and Chiaruttini, Vincent and Pierret, Stéphane Relation between crack growth behaviour and crack front morphology under hold-time conditions in DA Inconel 718. (2017) International Journal of Fatigue, 96. 17-27. ISSN 0142-1123

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Official URL: http://dx.doi.org/10.1016/j.ijfatigue.2016.11.015

Abstract

The crack growth behaviour of Direct Aged Inconel 718 was studied at 550 °C. Experiments were carried out under pure fatigue cycles, hold-time cycles of different durations and a mix of both. Hold-time cycles were systematically associated with complex crack front morphologies. A new numerical approach was developed to assess the effect of crack front morphology on the direct current potential drop technique, mechanical fields at the crack tip and ultimately, measured crack growth rates. Using this approach, a clear relation was established between crack front morphology and its evolution, and the crack growth behaviour under hold-time conditions. Complex crack front morphologies are demonstrated to be responsible for increased crack growth rates. From this, a crack growth mechanism under hold-time conditions is proposed. Finally, the numerical framework here presented is to be considered as a new, easily reproducible, way to properly analyse experimental data when dealing with complex loading cycles and complex crack front morphologies.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The original PDF of the article can be found at http://www.sciencedirect.com/science/article/pii/S0142112316303784?via%3Dihub
HAL Id:hal-01475729
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > SAFRAN (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:29 Aug 2017 07:39

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