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Void coalescence in a porous solid under dynamic loading conditions

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Abstract

Void coalescence in ductile voided solids subjected to dynamic loading is investigated numerically. Finite element simulations of an axisymmetric unit cell, taking inertia and finite strain effects into account, are used to describe the coalescence process in a porous material containing a periodic distribution of initially spherical voids. The numerical results suggest that inertia yields a stabilizing effect and slows down the necking of the ligaments between neighbouring voids. Besides, for sufficiently high stress triaxiality and loading rate, coalescence is found to occur by direct impingement, instead of ligament necking. This result correlates with experimental observations in spall fracture and dynamic crack propagation.

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Authors and Affiliations

  1. ENSTA Bretagne, Laboratoire Brestois de Mécanique et des Systèmes (LBMS)—EA 4325, 2 rue François Verny, 29806, Brest Cedex 9, France

    N. Jacques

  2. Université Paul Verlaine—Metz, Laboratoire d’Etude des Microstructures et de Mécanique des Matériaux (LEM3)—UMR CNRS 7239, Ile du Saulcy, 57045, Metz Cedex 1, France

    S. Mercier & A. Molinari

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  1. N. Jacques
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  2. S. Mercier
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  3. A. Molinari
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Correspondence to N. Jacques.

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Jacques, N., Mercier, S. & Molinari, A. Void coalescence in a porous solid under dynamic loading conditions. Int J Fract 173, 203–213 (2012). https://doi.org/10.1007/s10704-012-9683-5

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  • DOI: https://doi.org/10.1007/s10704-012-9683-5

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