3D shear-mode fatigue crack growth in maraging steel and Ti-6Al-4V

Abstract : Fatigue crack growth tests in mixed-mode II + III were performed on maraging steel and Ti-6Al- 4V. The 3D evolutions of the crack fronts -measured by SEM after interrupted tests- were analyzed, taking into account the reduction in effective crack driving force by the interlocking and friction of the asperities of the crack surface. Under small-scale yielding conditions, the mixed-mode crack growth rates were found to correlate best with Keff2 II + 1.2Keff2 III in maraging steel, while for Ti-6Al-4V, Keff2 II + 0.9Keff2 III appeared suitable. For extended plasticity, a crack growth prediction method is proposed and validated for Ti-6Al-4V. This method is based on elastic-plastic F.E. computations and application, ahead of each node of the crack front, of a shear-dominated fatigue criterion.
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Contributor : Véronique Doquet <>
Submitted on : Monday, July 12, 2010 - 5:40:02 PM
Last modification on : Wednesday, March 27, 2019 - 4:16:22 PM

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Véronique Doquet, Quang-Hien Bui, Graciela Bertolino, Elias Mehry, Lysandra Alves. 3D shear-mode fatigue crack growth in maraging steel and Ti-6Al-4V. International Journal of Fracture, Springer Verlag, 2010, 165 (1), pp.61 - 76. ⟨10.1007/s10704-010-9504-7⟩. ⟨hal-00501850⟩



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